a. Discuss the term heritability including its calculation, use and limitations.

Question

a. Discuss the term heritability including its calculation, use and limitations. Examples may be included. b. The narrow-sense heritability of egg weight in a particular flock of chickens is 0.6. A farmer selects for increased egg weight in his flock. The difference between the flock average egg weight and the average egg weight from the 40 hens Joe selects for breeding is 10g. i. What is the EBV for the selected group of 40 hens? ii. Joe mates these hens to a random group of 5 roosters. How much should egg weight increase in the offspring of the selected chickens? iii. Do you expect the average egg weight to increase by a constant amount if Joe continues this regime for the next 20 years? Explain.

Explanation / Answer

Heritability is statistic calculation by which genetic and environmental contribution in the phenotypic characteristic of any individual, can be calculated.

Phenotype(P) = Genotype + environmental

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