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Detection of silent oestrus in dairy cows by milk temperature measurement

Published online by Cambridge University Press:  02 September 2010

Z Gil
Affiliation:
Agricultural University, Al. Mickiewicza 24/28, 30-059 Kraków, Poland
J. Szarek
Affiliation:
Agricultural University, Al. Mickiewicza 24/28, 30-059 Kraków, Poland
J. Kural
Affiliation:
Proagra Unit — Co. Ltd, 32-064 Rudawa, Poland
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Abstract

Milk temperature was measured automatically during milking with a view to detecting silent oestrus in dairy cows. A total of 38 silent oestrous periods were studied, based mainly on ovulation and milk progesterone levels together with visual observation.

In 78·9% of silent oestrous periods, a significant increase in milk temperature amounting to a mean of 0·6 (s.e. 0·07)°C was found, and this was highly correlated (r = 0·90) with an increased body temperature. In most silent oestrous periods increases in milk and body temperatures and ovulation with milk progesterone levels below 2 μg/l were found, the oestrous cycles being characterized by typical progesterone profiles. In some cows increases in milk and body temperatures and ovulation during a silent oestrous period were associated with non-typical progesterone profiles although most of these occurred shortly after parturition.

Keywords

Type
Research Article
Copyright
Copyright © British Society of Animal Science 1997

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