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The periodicity and duration of oestrus in zebu and grade cattle

Published online by Cambridge University Press:  27 March 2009

James Anderson
James Anderson
Affiliation:
Experimental Station, Naivasha, Kenya
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Extract

Records are given for 1130 oestrous cycles in zebus and 678 cycles in grades. The mean length was 23·03 days in zebus and 22·42 days in grades. The mean duration of oestrus was 4·78 hr. in zebus. 7·40 hr. in grades. Neither exposure to additional light at night nor feeding a supplementary ration had any effect on the cycle of oestrus.

Seasonal variations in both the cycle and oestrus occurred in zebus, but in grades they were much less marked. An association between climatic conditions and sexual function was noted in that a season of increased temperature and sunshine was associated with increased sexual function and vice versa.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 34 , Issue 2 , April 1944 , pp. 57 - 68
Copyright
Copyright © Cambridge University Press 1944

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References

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