Methods Of Animal Improvement

Resumen

A herder near Sokoto wants calves that grow faster without losing the White Fulani's famous heat tolerance. A poultry keeper in Ibadan wants birds that lay like an exotic hybrid but survive a Nigerian backyard on local feed. Neither farmer can wish a better animal into existence. What they can do is choose who mates with whom, generation after generation, and that single choice is the whole of animal improvement.

In this lesson you will meet the four methods examiners expect you to know inside out: selection, crossbreeding, inbreeding and outbreeding. You will learn what each one does to a herd's genes, work through realistic farm scenarios that decide which method fits which goal, and master the advantage and disadvantage of each, the exact comparison WAEC sets almost every year.

Objetivos

  1. State the methods of animal improvement
  2. Explain selection as a method of animal improvement
  3. Explain crossbreeding as a method of animal improvement
  4. Distinguish between inbreeding and outbreeding
  5. Explain the advantages and disadvantages of each method of animal improvement

Nota de la lección

Two farmers each want a better herd. One mates his best cow to his best bull. The other buys in an exotic bull to cross onto his local cows. Both practise animal improvement, with different tools and risks. A breeder who cannot name the method used cannot predict the next generation, and an examiner will ask exactly that.

Evaluación de la lección

Felicitaciones por completar la lección del Methods Of Animal Improvement. Ahora que has explorado el conceptos e ideas clave, es hora de poner a prueba tus conocimientos. Esta sección ofrece una variedad de prácticas Preguntas diseñadas para reforzar su comprensión y ayudarle a evaluar su comprensión del material.

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Utiliza esta sección de evaluación como una oportunidad para reforzar tu comprensión del tema e identificar cualquier área en la que puedas necesitar un estudio adicional. No te desanimes por los desafíos que encuentres; en su lugar, míralos como oportunidades para el crecimiento y la mejora.

  1. Which method of animal improvement combines animals of two different breeds to produce offspring that may outperform both parent breeds? A. Selection B. Crossbreeding C. Inbreeding D. Outbreeding Answer: B
  2. Mating a sire to his own daughter is an example of: A. Crossbreeding B. Outbreeding C. Inbreeding D. Selection Answer: C
  3. The improved performance often shown by the first-cross offspring of two different breeds is called: A. Inbreeding depression B. Hybrid vigour C. Genotype drift D. Betterment Answer: B
  4. A herd that has been mated among close relatives for several generations begins to show smaller litter sizes and weaker offspring. This is best described as: A. Hybrid vigour B. Inbreeding depression C. Heterosis D. Selection response Answer: B
  5. Which method of animal improvement chooses the best-performing animals within a single breed as parents of the next generation? A. Crossbreeding B. Outbreeding C. Selection D. Hybridisation Answer: C

Libros Recomendados

Introduction to Animal Science: Global, Biological, Social and Industry Perspectives
Introduction to Animal Science: Global, Biological, Social and Industry Perspectives
Subtítulo: Sixth edition
Editorial: Pearson
Año: 2017
ISBN: 978-0-13-443605-0
Descripción: 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
Editorial: Food and Agriculture Organization of the United Nations
Año: 2004
ISBN: 978-92-5-105082-8
Descripción: 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
Editorial: Food and Agriculture Organization of the United Nations
Año: 1995
ISBN: 978-92-5-103758-4
Descripción: 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.

Preguntas Anteriores

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WAEC SSCE - Animal Husbandry - 2021

Pregunta 1 Informe

(a) Explain each of the following terms as used in the slaughtering of farm animals:
(i) scalding 
(ii) singeing:
(iii) evisceration.

(b) Name four agents involved in the marketing of farm animals and animal products

(c) State five marketing functions that could be performed to facilitate the sale of chicken and eggs.

(d) Name three stages in the life cycle of a roundworm.

(e) Mention two methods of animal improvement.

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