AG 001 Lecture Notes - Lecture 27: Outcrossing, Epistasis, Heterosis
8 Oct 2020
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Mass selection - animals with superior characteristics are selected from a herd and then allowed to mate among each other. Progeny testing - assessing on the breeding value of an animal on the basis of performance of its offsprings. Contemporary comparison -comparison of performance between heifers of the same age and sexual maturity. Process of mating selected males and females to produce offspring with the desired characteristics. To expand the inherited potential of the animal. To overcome production problems created by the environment. Genetic transmission of characteristics from parents to offsprings. The mechanism of inheritance is carried by the sex cells (gametes) and is controlled by genes found in the chromosomes. Genes are very tiny units of inheritance carrying particular characteristics, such as colour, body shape and amount of milk production. Chromosomes are genetic materials which carry genes. They exist in pairs paternal and maternal) in the nucleus f the body cells.
