eChapters

The purpose of the clinical examination is to identify the clinical abnormalities that are present and the risk factors that determine the occurrence of the disease in the individual or population. The focal point of any investigation of animal disease is the making of diagnosis and the critical part in making that decision is the clinical examination of the animal or group of animals. Without a proficient clinical examination and an accurate diagnosis it is unlikely that the treatment, control, prognosis and welfare of animals will be optimized.  The level of examination set out is sufficient to enable the clinician to determine the nature of the abnormality and the system involved.

RECTAL EXAMINATION

It provides practically all the information required.

It is the simplest, accurate and reliable method with no cost involved.

Things Required

A full arm rubber sleeve with attached glove or disposable plastic glove.
A rubber or plastic apron.
Non-irritant soap or lubricant.

Collections of blood To collect blood for different haematological analyses, an animal’s vein are punctured with a syringe and needle. Requirements • Hypodermic needle • Syringe • Collection vials or tubes containing anticoagulantsProcedure • The place of blood collection should always be cleaned with alcohol and hairs trimmed. • Press on the vein to raise it. • Free-flowing blood can be collected directly into the vial containing anticoagulant after the needle is inserted into the vein. • 5 ml of blood from large animals and 2.0 ml of blood from small animals like dogs and cats are sufficient for normal haematological investigations. • Rotational motions in the vials are used to mix the blood

True/False

Q.1.    The accuracy of the measurement refers to how close the measured value is to the true value.
Q.2.    The precision refers to how close a set or group of measurements are together.
Q.3.    If the processes of measurement are repeated under identical condition, then precision explains that up to what extent these repeated values are reliable.

• General considerations

 • Direct examination

 • Culture methods

 • Some important tests used in identification of bacteria

 • Characteristics of some organisms

 • Gram positive cocci

 • Gram positive rods

 • Gram negative rods

 • Mycobacteria

 • Leptospira/spirochete

 • Rickettsia

 • Chlamydia

 • Mycoplasma

 • Fungi

 • Virus

 • Antibacterial sensitivity testing

In avian medicine, because clinical signs in birds can be vague, veterinarians must rely on additional clinical tests to accurately diagnose and treat conditions. These tests, including hematology, urine analysis and others, are essential for understanding diseases early and tailoring effective treatments. Clinical hematology is qualitative and quantitative assessment of blood and other blood component for the treatment of clinical patient. In comparison to mammals, bird’s erythrocytes are oval and nucleated cells, nucleated thrombocytes, heterophiles instead of neutrophils. RBCs of birds have relatively short life span and regenerate more quickly than mammals. The preferred vein for blood collection in birds varies with the species. In most species the wing veins is preferred site. Both EDTA and heparin have been used in avian clinical haematology as anticoagulant. The average blood volume of most birds is approximately 10% body weight. Avian plasma samples frequently are yellow due to carotenoid pigments, not bilirubin. Uric acid is the major nitrogenous waste product of birds it is relatively inert and substantially less toxic than ammonia or urea. Both BUN and creatinine levels are normally low in birds and may be below the minimum detectable limit of the assays in the laboratory. It may be useful to evaluate BUN and uric acid together to differentiate among dehydration, postprandial effects and renal pathology.

Introduction
Heart failure can develop as a complication of almost all congenital and acquired cardiac diseases in dogs and cats. Cardiac disease is a significant global health concern, impacting both humans and domestic animals, particularly dogs. In the animal kingdom, the cardiovascular system consists of essential components, including the heart, veins, arteries, and capillary beds. Its proper function depends on complex mechanisms, such
as the atrioventricular valves (mitral and tricuspid) and the semilunar valves (aortic and pulmonic), which ensure that blood flows in only one direction through the heart. The activity of the cardiovascular system, including heart contraction rates and strengths, as well as blood vessel diameter adjustments, is regulated by the autonomic nervous system (both sympathetic and parasympathetic branches) and various hormones.
The strength of ventricular contractions is influenced by several factors, primarily enddiastolic volume (preload) and myocardial contractility (inotropy). Preload is the amount of blood in the ventricles just before they contract, while contractility refers to the ability of the heart muscle fibers to contract. Preload is determined by the difference between the end-diastolic pressure in the ventricle and the pressure in the pleural space, adjusted for the
stiffness of the ventricular myocardium. This pressure is influenced by the ratio of blood volume to the heart muscle’s compliance. Low-pressure volume receptors in the heart and large veins primarily regulate preload. When these receptors detect increased blood volume or vein distension, they trigger responses such as increased urine production and vein dilation, which help reduce blood volume and lower venous pressures. Increased enddiastolic volume (preload) stretches the ventricular wall, enhancing contraction strength through the Frank-Starling mechanism, or Starling’s law of the heart. This stretching activates receptors in the atria and ventricles, leading to the release of natriuretic peptides like brain natriuretic peptide (BNP) from the ventricles and atrial natriuretic peptide (ANP) from the atria) These peptides promote natriuresis, relax smooth muscle, and counteract
vasopressin and angiotensin II. In dogs, levels of BNP and NT-proBNP are directly related to cardiac stretch.

Introduction
The digestive system is essential for the survival and overall health of all animals, and its proper function is crucial for the digestion, absorption, and metabolism of nutrients. In monogastric animals-those with a single-chambered stomach, such as dogs, cats, pigs, and horses-the digestive process is both complex and finely tuned to meet their specific nutritional needs. Understanding the clinical physiology of digestive disorders in monogastric animals is vital for veterinary professionals, animal caretakers, and researchers, as it enables them to recognize, iagnose, and treat various gastrointestinal conditions that may impact these 
species. This introduction provides an overview of the fundamental aspects of digestive physiology in monogastric animals, outlines common digestive disorders, and highlights the importance of this knowledge in clinical practice.
The digestive tract of monogastric animals consists of several organs that work together to break down food, absorb nutrients, and expel waste. The primary components include the mouth, esophagus, stomach, small intestine, large intestine, and associated glands such as the salivary glands, liver, and pancreas.
The digestive process begins in the mouth, where food is mechanically broken down by chewing and mixed with saliva, which contains enzymes like amylase to initiate the breakdown of carbohydrates. The bolus of food is then transported through the esophagus to the stomach via coordinated muscular contractions known as peristalsis. In the stomach, food is mixed with gastric secretions, including hydrochloric acid (HCl) and digestive enzymes like pepsin, which help break down proteins. The stomach’s acidic environment also plays a critical role in killing pathogens and aiding the digestion of certain nutrients, such as vitamin B12. The stomach of monogastric animals differs from that of ruminants, as it does not possess multiple compartments for fermentation but rather relies on enzymatic digestion.
The chyme (partially digested food) passes into the small intestine, where most digestion and nutrient absorption occur. The small intestine is composed of three segments-the duodenum, jejunum, and ileum-each with specialized functions. Enzymes secreted by the pancreas and bile from the liver facilitate the digestion of carbohydrates, proteins, and fats. The intestinal lining, with its villi and microvilli, maximizes the surface area for nutrient absorption.

Introduction
In cattle, the digestive system consists of four primary compartments: the rumen, reticulum, omasum, and abomasum, followed by the small and large intestines. The rumen plays a crucial role as a fermentation chamber, maintaining anaerobic conditions and ensuring thorough mixing, as well as regulating temperature and pH levels. Food, which is frequently re-chewed, enters the rumen through the esophagus, where fermentation occurs.
The byproducts of fermentation are either absorbed within the rumen or moved on for further digestion and absorption in other parts of the digestive system. Simple indigestion in ruminants is a temporary disruption in gastrointestinal function, usually caused by a sudden change in the quality or quantity of their diet. Consuming large amounts of indigestible feed can impair rumen function for 24 to 48 hours after ingestion, as the accumulation of this feed can physically disrupt ruminal activity. Additionally, the breakdown of proteins in the rumen can produce toxic substances such as amides and amines, including histamine. This condition can lead to a significant drop in milk production due to a marked reduction in the production of volatile fatty acids in a hypotonic reticulorumen. Ruminal impaction is a condition seen in ruminants like cows, sheep,and goats, where the  rumen’s contents become compacted, obstructing their movement through the digestive tract. This condition can arise from various causes, including the ingestion of plastic waste, grazing habits, mineral deficiencies, negative energy balance, urbanization, inadequate water intake, low-fiber or high-grain diets, changes in feed or grazing patterns, and stress. The accumulation of foreign material can block fermentation, interfere with the mixing of rumen contents, and disrupt the rumen’s microflora, leading to indigestion. Acute ruminal acidosis is often caused by the sudden intake of large amounts of carbohydrate-rich feed, particularly grains. Subacute ruminal acidosis (SARA) occurs in dairy cattle and is characterized by disrupted ruminal fermentation. It typically results from feeding large amounts of concentrates with insufficient fiber, a practice often used to boost milk production during early lactation. This imbalance in diet can disturb rumen pH and microbial populations, leading to various metabolic and digestive problems. Chronic ruminal acidosis can lead to complications such as rumenitis, which is inflammation of the rumen, and laminitis, a painful condition affecting the hooves. Alkaline indigestion, also known as ruminal alkalosis, occurs when the pH of ruminal fluid rises above 7.5.
 

Introduction
The endocrine system comprises a network of glands responsible for producing and releasing hormones that regulate essential bodily functions, particularly the conversion of calories into energy for cellular and organ function. Endocrinology, a medical branch, focuses on these disorders, which often present complexities involving a combination of hypersecretion and hyposecretion due to intricate feedback mechanisms within
the endocrine system. Glands within this system release distinct hormones into the bloodstream, where they travel to various cells, playing a pivotal role in coordinating and controlling numerous physiological processes. The coordination of normal physiological processes involves the interplay between the endocrine and nervous systems. Neurons with neurosecretory functions in the supraoptic and paraventricular nuclei of the hypothalamus
generate peptides and amines. Endocrine disorders refer to a broad range of conditions that affect the endocrine system, a complex network of glands responsible for producing and regulating hormones in the body.
Hormones play a crucial role in controlling various bodily functions, including growth and development, metabolism, electrolyte balance, and reproductive processes. When the endocrine system fails to function properly, it can lead to a wide range of disorders that can significantly impact an individual's quality of life. The endocrine system comprises several glands located throughout the body, each producing specific hormones that regulate various physiological processes. The main endocrine glands include:
1. Pituitary gland: Often referred to as the "master gland," the pituitary gland regulates the function of other endocrine glands and produces hormones that control growth and development.
2. Thyroid gland: Located in the neck, the thyroid gland produces hormones that regulate metabolism, energy production, and growth.
3. Adrenal glands: Situated on top of the kidneys, the adrenal glands produce hormones that control electrolyte balance, blood pressure, and stress response.

Introduction
Eye
Visual perception, eyesight, sight, or vision is the ability to interpret the surrounding environment using light in the visible spectrum reflected by the objects in the environment. The eyes are the sensory organs that are extension of the brain; they receive visual information from the environment and transmit them to the visual sensory area of the brain for interpretation.
The pineal and para-pineal glands are photoreceptive in non-mammalian vertebrates. Birds have photoactive cerebrospinal fluid (CSF)-contacting neurons within the paraventricular organ that respond to light in the absence of input from the eyes or neurotransmitters.
Accessory Structure of the Eye
Eyelids - (Palpebrae) The free margins of the eyelids form the palpebral fissure. The edges where the upper and lower eyelids meet are called the lateral and medial canthus. The palpebral margins are lined by eyelashes. The eyelids are supported internally by sheets of connective tissue that form the tarsal plate.
Glands associated with the eyelids
Glands of Zeis - These are sebaceous glands associated with the eyelashes.
Tarsal glands - (Meibomian glands) - These glands line the inner margin of the lid and
produce a lipid-rich product that prevents the lids from sticking together.
Lacrimal caruncle - This is a mound of tissue in the medial canthus that produces thick secretions.
Conjunctiva It is the epithelium that lines the inner surface of the eyelids and continueson to the outer surface of the eye.
Palpebral conjunctiva lines the inner surface of the eyelid.
Bulbar conjunctiva lines the anterior surface of the eye.
Lacrimal Apparatus It produces, distributes and removes tears. Tears reduce friction, remove debris, prevent bacterial infection and provide nutrients and oxygen for the conjunctiva. Lacrimal glands are located near the lateral canthus of the eye. Tears flow over the cornea and are drained into the nose by the nasolacrimal duct.

Introduction
Normal reproduction in the female depends on hormones, which specific chemical substances produced by specialized glands are called endocrine glands. These secretions pass into the blood and lymph fluids and are transported to various parts of the body, where they exert several specific effects. Reproductive hormones may originate in the hypothalamus, pituitary, gonads, uterus, or placenta. Hypothalamic hormones are produced
in the hypothalamus, a portion of the brain that is the neural control center for reproductive hormones. The role of hypothalamic hormones is to regulate the release of other hormones from the pituitary gland, and many hypothalamic hormones are therefore called releasing hormones. The primary releasing hormone of reproduction is gonadotropin-releasing hormone (GnRH). GnRH controls the release of follicle-stimulating hormone (FSH)
and luteinizing hormone (LH) from the pituitary gland, located at the base of the brain. These pituitary hormones regulate the production of estrogen and progesterone from the ovary. FSH stimulates the follicle’s growth, development, and function, while LH causes\= the follicle to rupture and the corpus luteum to develop. The female hormone estrogen is produced by the Graafian follicle on the ovary. Another hormone originating from the
ovary is progesterone, which is produced by the corpus luteum. Each has an important role in the female reproductive process.
A relatively new discovery in reproductive physiology is that follicular growth is not continuous in the bovine, but occurs in waves (2 to 4 waves per cycle). Each wave begins when the dominant follicle in the previous wave gains maximal size, at which time numerous small follicles begin a period of rapid growth. From this group of follicles, one follicle is allowed to grow to a much larger size than the others. This large follicle is called the dominant follicle, because it has the ability to regulate and restrict the growth of the smaller follicles. A few days after reaching maximum size, the dominant follicle begins to degenerate and die.

Bleeding disorders can be either congenital, present from birth, or acquired, developing later in life. Defects in blood clotting proteins typically result in delayed bleeding and deep tissue bruising, whereas platelet defects often lead to superficial bruises, nosebleeds, black stools, and prolonged bleeding at injection sites or during surgery. Blood clotting tests can identify animals with defective clotting proteins, but they are not very sensitive.
Congenital Clotting Protein Disorders
Congenital clotting protein disorders are present from birth, and severe deficiencies or defects in these proteins typically manifest early in life. Such severe defects can be fatal, with affected animals often being stillborn or dying shortly after birth. Additionally, a lack of clotting proteins or vitamin K in a newborn can exacerbate clotting issues. If the level of a specific clotting protein is only 5 to 10% of normal, the newborn might survive but is likely to show signs of illness before reaching 6 months of age.
Hypofibrinogenemia, characterized by an abnormal shortage of fibrinogen in the blood and severe bleeding, has been observed in Saint Bernards. Dysfibrinogenemia, which involves abnormally functioning fibrinogen, has been reported in an inbred family of Russian Wolfhounds. Affected dogs experience mild bleeding problems, such as nosebleeds, but may suffer life-threatening bleeding from injuries or surgeries. The best treatment for this condition is intravenous transfusion with fresh or fresh-frozen plasma.
Factor II (prothrombin) disorders are rare. Prothrombin is a key protein in blood clotting. In Boxer dogs, prothrombin is present in normal amounts but does not function properly. Affected puppies may experience nosebleeds and bleeding gums, which tend to improve with age. In adult dogs, easy bruising and inflamed skin are common. Treatment involves transfusions of whole blood or plasma Factor VII deficiency has been reported in several breeds, including Beagles, English Bulldogs, Alaskan Malamutes, Miniature Schnauzers, Boxers, and mixed-breed dogs. This condition can lead to prolonged bleeding after giving birth and is often diagnosed incidentally during clotting tests.

Introduction
The haematological system, essential for sustaining life and comprising blood and its components, is fundamental to human and animal physiology. Blood is a unique connective tissue that performs several critical functions, including transporting oxygen, nutrients, and hormones to cells and removing metabolic wastes. It also plays a pivotal role in immune response, haemostasis, and the regulation of body temperature and pH. This
section provides an in-depth overview of the clinical physiology of the haematological system, covering the composition of blood, haematopoiesis, haemostasis, and common haematological disorders. Blood is composed of two main elements: plasma and blood cells. Plasma, the liquid component, constitutes approximately 55% of blood volume and consists predominantly of water, electrolytes, proteins, waste products, and dissolved gases. Plasma is the medium for transporting nutrients, gases, hormones, and waste products throughout the body. It contains important proteins such as albumin, which maintains osmotic pressure; globulins, which are involved in immune responses; and fibrinogen, which is crucial for blood clotting. The blood cells include erythrocytes (red blood cells), leukocytes (white blood cells), and platelets. Erythrocytes are the most abundant cells in the blood, with the primary function of transporting oxygen from the lungs to tissues and carbon dioxide from tissues back to the lungs. This is facilitated by haemoglobin, an iron-containing protein within erythrocytes that binds to oxygen. The lifespan of an erythrocyte is approximately 120 days, after which it is phagocytosed by macrophages, which are a type of myeloid phagocytic cells in the spleen and liver. Leukocytes are integral to the immune system, protecting the body against infections and foreign pathogens. They are categorized into granulocytes (neutrophils, eosinophils, and basophils) and agranulocytes (lymphocytes and monocytes).

Introduction
The testicle is a unique and important reproductive organ that serves two main purposes. The primary purpose is the development of mature spermatozoa that are able to fertilise the egg.The production of hormones, which plays a role in ensuring that mature spermatozoa are delivered to mature eggs where fertilisation may take place, must be considered a supplemental function to the development of germ cells. The induction of behavioristic
reactions—also referred to as sex drive or mating instincts—and the provision of a means of transportation for spermatozoa, as well as the regulation of ejaculate—either its release into the aquatic medium surrounding the egg in the case of lower vertebrates or its introduction into female passages through an organ of intromission—are the two concrete necessities involved. The animal loses its ability to reproduce as long as either the production of germ cells or the propensity to mate is impaired, even though the two processes undoubtedly work in tandem to achieve the end result.

Introduction
The nervous system in animals is a complex group of highly specialized cells capable of collecting and transmitting information in response to external stimuli via receptors and highly specialized sensory organs. It aids in the regulation of muscle coordination, the release of hormones, neurotransmitters, and other chemical mediators, all of which facilitate numerous bodily activities.
The nervous system is divided into two systems: the central nervous system (CNS), which includes the brain and spinal cord, and the peripheral nervous system. Within these systems, there is another autonomic nervous system (ANS), which is distinguished by higher centers of the hypothalamus, midbrain, pons, and medulla, as well as tracts and nuclei in the spinal cord. The ANS is further divided into sympathetic and parasympathetic
systems, which help maintain homeostasis and activate emergency mechanisms in response to external stimuli. The brain is normally covered by three meninges: piameter, arachnoid, and durameter. These meninges create three spaces: the subarachnoid space (between pia mater and arachnoid), the subdural space (between arachnoid and dura mater), and the epidural space (between dura mater and the ligamentum flavum in the spinal canal). The subarachnoid space includes cerebrospinal fluid, which is isolated from cerebral blood by the morphological and enzymatic activity of cells with tight junctions that regulate intercellular diffusion and solute exchange inside the cells. These cells form a barrier known as the “blood-brain barrier”.
The blood-brain barrier works as a selective permeable membrane, allowing only certain chemicals and medications to pass through while excreting essential components from the central nervous system via energy-dependent efflux pumps like p-glycoprotein. These proteins are encoded by genes such as ABCB1, and mutations in them can result in severe effects such as Ivermectin poisoning in the Colie breed of dogs. Similarly, it aids in the relative isolation of the neurological system from the immune system by establishing an immune-suppressive parenchymal milieu. However, various infections, trauma, and developmental defects can result in underdevelopment or damage to different cerebellar structures. As a result, depending on the portion implicated, it might cause changed behavioral changes in animals such as muscle incoordination, depression, and paralysis. These clinical symptoms may be excitatory.

Introduction
Respiratory diseases are a common clinical issue in dogs, particularly in those housed in environments like pet shops, shelters, breeding and boarding kennels. Puppies and senior dogs are at a higher risk of developing respiratory infections compared to adult dogs. The respiratory system is one of the body’s four major systems, comprising the upper airways (pharynx, larynx, and trachea and the lower airways (bronchi, bronchioles, and
alveoli). The pharynx, which serves as a common passageway for both the respiratory and gastrointestinal systems, explains the relatively high incidence of aspiration pneumonia. The luminal diameter of the pharynx is the widest, followed by the larynx and trachea.
The ratio of tracheal diameter to thoracic inlet height (TD:TI) remains relatively constant, regardless of the animal’s size or respiratory phase. The respiratory tract is typically protected from harmful pathogens by physical, chemical, and immunologicbarriers, including mucus, mucociliary clearance, innate antimicrobial factors, alveolar macrophages, and the pulmonary immune response. The entire respiratory tree is lined with ciliated epithelial cells, except for the bronchioles, which are lined by non-ciliated granular secretory cells known as club cells. The respiratory system’s primary function is achieved through four major processes: pulmonary ventilation; diffusion of oxygen and carbon dioxide between the alveoli and the blood; transport of these gases in the blood and body fluids to and from the body’s tissue cells; and regulation of ventilation and other respiratory factors. The pulmonary alveoli, the main sites for gas exchange between air and blood, are highly vulnerable to injury if the body’s defense mechanisms are compromised, underscoring the importance of prompt emergency treatment for respiratory diseases

Introduction
The skin, also known as the integumentary system, is the largest organ of the human body and protects animals from external factors. It consists of different tissues (epidermis, dermis, hypodermis, glands, hair and nails) and plays an important role in maintaining homeostasis, especially in regulating body temperature, protecting the body from damage and sensing the outside world. The skin consists of three main layers: epidermis, dermis and subcutaneous tissue; each has its own specific function. The epidermis is the outermost layer of keratinocytes that produce keratin as a protective layer. The dermis, beneath the epidermis, is rich in collagen and elastin, which give the skin strength and elasticity. The subcutaneous tissue beneath the dermis consists of fatty tissue and acts as an insulator for the body. Dermal fibroblasts are the primary cells that synthesize and maintain the skin’s extracellular matrix, contributing to its structural integrity and function. The integumentary system also plays an important role in regulating temperature, providing sensation, synthesizing biochemicals, absorbing nutrients, and protecting the body from various types of damage. In general, the integumentary system plays an important role in the body’s overall health and function by regulating body temperature, providing a sense of well-being, producing important biochemicals, absorbing nutrients, and protecting the body from external factors.

Introduction
The renal system is primarily responsible for the filtration of waste products from blood plasma through urine production. The kidneys, along with the ureters, bladder, and urethra, are part of the urinary system responsible for removing waste products from blood and eliminating them in urine. They filter around 120 ml of blood plasma per minute and perform homeostatic roles such as regulating blood volume and pressure, pH and electrolyte
composition, stimulating erythropoiesis, and supporting vitamin D biosynthesis. Nephrons, with around 1-1.3 million per adult kidney, are primarily cortical, with 80-85% of them located in the renal cortex. The remaining 15-20% are called juxtamedullary nephrons. The kidneys remove nitrogenous compounds like urea, uric acid, and creatinine, as well as metabolic waste products, toxins, excess hormones, water, and electrolytes. Urine formation involves three main stages: glomerular filtration, tubular reabsorption, and secretion. The kidneys produce renal filtrate, which contains blood components that can be filtered out, and the body recovers 99% of the water and electrolytes from the filtrate. The renal corpuscle, comprising the Bowman’s capsule and glomerular capillaries, is responsible for filtration of blood plasma and producing renal filtrate. Its structural elements allow
for efficient filtration, with glomerular capillaries having a 100-fold greater permeability to water, small ions, and solutes. The glomerular capillaries also have increased pressure due to the smaller diameter of the efferent arteriole. The filtration membrane consists of endothelium, basement membrane, and podocytes. The proximal convoluted tubule in the kidneys plays a crucial role in reabsorption of water and electrolytes, including sodium,
chloride, potassium, calcium, and bicarbonate. It reabsorbs approximately 80% of filtered bicarbonate, with further reabsorption from the loop of Henle and distal convoluted tubule. This reabsorption regulates the body’s acid-base balance, contributing to the acidic nature of urine. The proximal convoluted tubule is the only region able to reabsorb glucose. The loop of Henle is a crucial region in the kidney, responsible for concentrating urine and facilitating water and electrolyte reabsorption. It regulates fluid volume, blood pressure, and acid-base balance through bicarbonate reabsorption. The loop consists of two main regions: the descending limb and the ascending limb.

Creatinine Clinical significance Creatinine is produced at a steady rate due to muscle catabolism and is not reabsorbed by the kidney tubules after filtration. Its measurement provides an indirect assessment of the glomerular filtration rate (GFR). Unlike urea it is not markedly affected by diet or any aspect of liver function and therefore the test is more specific for renal dysfunction