AGE 204 — Anatomy and Physiology of Farm Animals: Lecture Note

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This is the complete lecture note for AGE 204 Anatomy and Physiology of Farm Animals. You can read it online below, open it in the full viewer, or download the PDF for offline study. It pairs with the course's video lectures, so you can read and watch together.

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AGE la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS

AGE la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Course code: AGE 204 Course title: Anatomy and Physiology of Farm Animals Course credit load: 2 Units Series 1: Topographical and Descriptive Terms in Animal Anatomy • Part 1.1: Introduction to Animal Anatomy o Sub Part 1.1.1: Definition and scope of anatomy and physiology o Sub Part 1.1.2: Importance of anatomy and physiology to animal production o Sub Part 1.1.3: Major body systems and their interrelationships • Part 1.2: Anatomical Planes, Directions, and Regions o Sub Part 1.2.1: Body planes and sections o Sub Part 1.2.2: Directional and positional terms o Sub Part 1.2.3: Topographical regions of the body • Part 1.3: Body Cavities and Their Contents o Sub Part 1.3.1: The thoracic cavity and its organs o Sub Part 1.3.2: The abdominal and pelvic cavities o Sub Part 1.3.3: Serous membranes lining body cavities • Part 1.4: Cells, Tissues, and Organs o Sub Part 1.4.1: The animal cell o Sub Part 1.4.2: The four tissue types o Sub Part 1.4.3: Organisation from tissue to organ to system

AGE la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Introduction Before a student can understand how a cow digests feed, how a chicken's heart pumps blood, or how a goat's kidney filters waste, they must first learn the language of anatomy. The directional and descriptive terms used in veterinary and animal science create a shared vocabulary that makes description of the animal body precise regardless of the position of the animal or the observer. The aim of this Series is to introduce the scope of anatomy and physiology in farm animal production, to establish the standard terms for body planes, directions, regions, and cavities, and to review the organisation of the animal body from cell to tissue to organ to system. We shall begin with anatomy and physiology definitions, move through planes and directional terms, examine the body cavities, and conclude with cellular and tissue organisation. Series Learning Outcomes Upon completing this Series, you should be able to: • SLO 1.1 define anatomy and physiology and distinguish between gross and microscopic anatomy (Linked to Part 1.1), • SLO 1.2 explain the importance of anatomy and physiology to farm animal production (Linked to Part 1.1), • SLO 1.3 name the major body systems of farm animals and describe their general functions (Linked to Part 1.1), • SLO 1.4 define and correctly use the standard anatomical planes and sectional terms (Linked to Part 1.2), • SLO 1.5 apply directional terms correctly to describe the location of structures on farm animal bodies (Linked to Part 1.2), • SLO 1.6 identify the major topographical regions of cattle, sheep, goats, pigs, and poultry (Linked to Part 1.2), • SLO 1.7 identify and describe the contents of the thoracic, abdominal, and pelvic cavities (Linked to Part 1.3),

AGE la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS • SLO 1.8 describe the serous membranes lining body cavities and explain their function (Linked to Part 1.3), and • SLO 1.9 describe the animal cell, the four tissue types, and the hierarchical organisation from cell to organ system (Linked to Part 1.4). 1.1 Introduction to Animal Anatomy 1.1.1 Definition and scope of anatomy and physiology Anatomy is the science of the structure of living organisms. Gross anatomy studies structures visible to the naked eye such as organs, bones, and blood vessels. Histology examines tissues under the microscope, and cytology examines individual cells. Comparative anatomy compares structures across species, which is essential for understanding how cattle, sheep, pigs, and poultry differ in body organisation. Physiology is the science of how organisms function. It explains mechanisms such as rumen fermentation, kidney filtration, and hormonal control of reproduction. Anatomy and physiology are inseparable: structure determines function, and understanding function requires knowledge of the underlying structure. Together they form the scientific foundation of all farm animal management disciplines. Fill in the blank: ________ is the science of structure while physiology is the science of function; both are studied together as the foundation of farm animal production.

AGE la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Figure 1.1: Diagram showing the subdivisions of anatomy and their relationship to physiology in farm animal science 1.1.2 Importance of anatomy and physiology to animal production Knowledge of anatomy and physiology underpins every practical decision in farm animal production. Feeding programmes are designed around the digestive anatomy of each species: ruminants have a multi-chambered fermentation stomach, so rations must support rumen function, while poultry lack a rumen entirely and require directly digestible feeds. Reproductive management depends on knowledge of the reproductive tract, oestrous cycle, and mechanisms of parturition.

AGE la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Health management requires anatomical knowledge to locate lesions, interpret clinical signs, and perform procedures such as injections and catheterisation at the correct site. Production assessment depends on understanding how the mammary gland produces milk, how muscle is deposited in the carcass, and how the integument reflects nutritional status. Anatomy and physiology are the conceptual framework within which nutrition, breeding, and health courses are integrated. Fill in the blank: Feeding programmes for ruminants are designed around the ________ anatomy, specifically the fermentation function of the multi-chambered stomach that distinguishes them from poultry. Figure 1.2: Diagram showing anatomy and physiology at the centre connected to the practical disciplines of animal production

AGE la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS 1.1.3 Major body systems and their interrelationships The body of a farm animal is organised into systems that work together to maintain life and support production. The major systems are: skeletal (support and movement), muscular (locomotion), integumentary (body surface protection), digestive (nutrient processing), cardiovascular (blood circulation), lymphatic (immune defence and fluid balance), respiratory (gas exchange), urinary (waste elimination), nervous (coordination), endocrine (hormonal regulation), and reproductive (offspring production). No system operates in isolation. The digestive system delivers nutrients that the cardiovascular system transports to every cell; the nervous and endocrine systems coordinate all others. This interconnection means that a problem in one system has consequences throughout the animal. Anaemia from parasitism, for example, reduces oxygen delivery and impairs growth, immune function, and reproductive performance simultaneously. Fill in the blank: The animal body is organised into organ ________, each performing specific functions, but no system operates independently as all are interconnected through the cardiovascular, nervous, and endocrine systems.

AGE la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Figure 1.3: Network diagram showing the eleven major body systems of farm animals and their primary interconnections Pilot questions 1.1 1. Define anatomy and physiology and explain why they are studied together. 2. Distinguish between gross anatomy, histology, and cytology. 3. Explain how knowledge of the digestive system influences feeding programmes for ruminants versus poultry. 4. Name seven major body systems of farm animals and state the primary function of each. 5. Explain why anaemia caused by parasitism can affect multiple body systems simultaneously.

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