AGB-0099
QUESTION
Selection differential depends on all except?
OPTIONS
(A) Sex of the animal
(B) Proportion
(C) Heritability
(D) Phenotypic standard deviation
ANSWER
(C) Heritability
EXPLANATION
Selection differential is determined from the difference between the mean of selected individuals and the population mean and, when standardized, relates to the phenotypic standard deviation and the proportion selected. Heritability affects response to selection, not the selection differential itself, so heritability is the exception.Most of the major draught breeds of Indian cattle were developed in the southern region, where traditional livestock production systems selected animals for endurance, heat tolerance and suitability for agricultural work. The coastal and dry northern regions also contain important cattle breeds, but they are not the principal region associated with the majority of India's draught breeds.