Digestive System

Aperçu

Put a pig and a goat in the same paddock in Jos and feed them nothing but dry maize stover for a week. The goat holds its condition. The pig loses weight fast. Both animals have a mouth, a stomach and intestines, so the difference cannot be that one eats and the other does not. The difference is what happens between the mouth and the intestine, and that is the whole subject of this lesson.

You will trace two digestive tracts organ by organ: the pig's simple, single-chambered system, and the cow or goat's four-compartment ruminant system. You will meet the rumen's population of microbes, the only workforce on the farm that can actually break down cellulose, and see exactly why a compound stomach turns rough, fibrous, cheap feed into meat and milk. Nearly every later topic on nutrition and feeding assumes you already know this system cold, so build it carefully now.

Objectifs

  1. Identify the parts of the digestive system of a monogastric animal
  2. Identify the parts of the digestive system of a ruminant animal
  3. Distinguish between the digestive system of a monogastric and a ruminant animal
  4. Explain the process of digestion in farm animals
  5. State the functions of the four compartments of the ruminant stomach

Note de cours

A feed salesman in Ilorin once sold a smallholder a sack of poultry-style concentrate for her two goats, promising faster gains than grazing. Within a fortnight one goat was bloated and off its feed. The salesman had ignored something a WAEC candidate must know cold: a goat's stomach is not built like a chicken's or a pig's, and feeding it the wrong way disturbs an entire population of living microbes inside it. Knowing how a gut is built, not just that it exists, is what separates sound livestock management from an expensive mistake.

Évaluation de la leçon

Félicitations, vous avez terminé la leçon sur Digestive System. Maintenant que vous avez exploré le concepts et idées clés, il est temps de mettre vos connaissances à lépreuve. Cette section propose une variété de pratiques des questions conçues pour renforcer votre compréhension et vous aider à évaluer votre compréhension de la matière.

Vous rencontrerez un mélange de types de questions, y compris des questions à choix multiple, des questions à réponse courte et des questions de rédaction. Chaque question est soigneusement conçue pour évaluer différents aspects de vos connaissances et de vos compétences en pensée critique.

Utilisez cette section d'évaluation comme une occasion de renforcer votre compréhension du sujet et d'identifier les domaines où vous pourriez avoir besoin d'étudier davantage. Ne soyez pas découragé par les défis que vous rencontrez ; considérez-les plutôt comme des opportunités de croissance et d'amélioration.

  1. Which of the following is the correct order in which feed passes through the compartments of a ruminant stomach? A. Reticulum, rumen, abomasum, omasum B. Rumen, reticulum, omasum, abomasum C. Omasum, reticulum, rumen, abomasum D. Rumen, omasum, reticulum, abomasum Answer: B
  2. The true, glandular stomach of a ruminant, which secretes hydrochloric acid and pepsin, is the: A. Rumen B. Reticulum C. Omasum D. Abomasum Answer: D
  3. The main compounds absorbed from the rumen as an energy source, produced by microbial fermentation of fibre, are called: A. Amino acids B. Volatile fatty acids C. Simple sugars D. Bile salts Answer: B
  4. Which organ in the pig performs a fermentation role broadly similar to, but much smaller than, the ruminant rumen? A. Duodenum B. Caecum C. Oesophagus D. Reticulum Answer: B
  5. The regurgitation and re-chewing of partly fermented feed by a ruminant is known as: A. Peristalsis B. Egestion C. Rumination D. Mastication Answer: C

Livres recommandés

Introduction to Animal Science: Global, Biological, Social and Industry Perspectives
Introduction to Animal Science: Global, Biological, Social and Industry Perspectives
Sous-titre: Sixth edition
Éditeur: Pearson
Année: 2017
ISBN: 978-0-13-443605-0
Description: A comprehensive introduction to animal science covering anatomy and physiology, nutrition, genetics, reproduction, animal health and the major farm animal species and their production systems.
Small-scale Poultry Production: Technical Guide
Small-scale Poultry Production: Technical Guide
Éditeur: Food and Agriculture Organization of the United Nations
Année: 2004
ISBN: 978-92-5-105082-8
Description: An FAO Animal Production and Health Paper written by a Nigerian animal scientist, covering breeds, housing, feeding, incubation, disease control and marketing for small-scale poultry keepers in developing countries.
Tropical Animal Feeding: A Manual for Research Workers
Tropical Animal Feeding: A Manual for Research Workers
Éditeur: Food and Agriculture Organization of the United Nations
Année: 1995
ISBN: 978-92-5-103758-4
Description: An FAO Animal Production and Health Paper on the principles of ruminant and non-ruminant nutrition and the practical use of tropical feed resources, including crop residues and by-products, in sustainable livestock systems.

Questions précédentes

Vous vous demandez à quoi ressemblent les questions passées sur ce sujet ? Voici plusieurs questions sur Digestive System des années précédentes.

WAEC SSCE - Animal Husbandry - 2021

Question 1 Rapport

(a) State four ways in which livestock 1s important

(b)i. Mention sIx organs associated with the digestive system in rabbits.

(ii) State two functions of the alimentary canal in livestock

(c)i. State lour functions of the liver in farm animals

(ii) Mention two parasites that could be found in the liver of cattle

(d) State two differences between the digestive s systems of a goat and a rabbit

Voir la réponse