A Note on Heritability of Growth of Sahiwal Heifers to Bulling Age and Its Correlation With Milk Yield

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Date
1968
Authors
Mwandotto B.A.J
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Abstract
The breeding plan of the National Sahiwal Stud, Naivasha, places more emphasis on milk yield relative to growth rate as a measure of beef production component of the Sahiwal dualpurpose breed. The plan was drawn with an assumption that genetic correlation between growth rate and milk production was essentially zero. Animals with higher genetic growth capacity, however, tend to have higher growth hormone concentrations in the blood that stimulate better mammary growth and higher milk yield (Sejrsen, 1978). Excessive milk yield beyond calf needs in an extensive grazing system lowers efficiency of production at weaning and in the feedlot (Willham, 1972) and Naivasha data indicate that maximizing milk yield of Sahiwal cattle would protract calving intervals and therefore decrease annual calf crop (Mwandotto, 1986).
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East African Agricultural And Forestry Journal, LII (2), p. 127-129
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