Oestrus and Time of Ovulation in Friesian Cattle in Kenya

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Date
1974/1975
Authors
de Vries S.
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Abstract
From literature it becomes evident that yet undisclosed climatic factors cause a shorter oestrus in cattle in tropical and sub-tropical areas as compared to temperate areas where the mean duration of oestrus in cows is generally accepted to be approximately 20 hours (Cole and Cupps, 1969; Salisbury and Vandemark, 1961). Reported means in tropical and subtropical areas vary from 1•3 hours found in Kenya by Anderson (1936a) to approximately 16 hours found in Zambia by Rakha, Egboeli and King (1971). A mean duration of approximately 11.5 hours was recorded in Louisiana by Hall, et al. (1959) and in Kenya by Vries,et at. (1973). No report demonstrates significant differences between breeds.
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East African Agricultural And Forestry Journal, 40, p. 227-232
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