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Diurnal patterns of heat production and heart rate under thermoneutral conditions in Holstein Friesian cows differing in milk production

Published online by Cambridge University Press:  27 March 2009

B. P. Purwanto ,
Y. Abo ,
R. Sakamoto ,
F. Furumoto  and
S. Yamamoto
B. P. Purwanto
Affiliation:
Department of Animal Science, Hiroshima University, Higashihiroshima, 724Japan
Y. Abo
Affiliation:
Department of Animal Science, Hiroshima University, Higashihiroshima, 724Japan
R. Sakamoto
Affiliation:
Department of Animal Science, Hiroshima University, Higashihiroshima, 724Japan
F. Furumoto
Affiliation:
Hiroshima Animal Husbandry Experimental Station, Shobara, 727Japan
S. Yamamoto
Affiliation:
Department of Animal Science, Hiroshima University, Higashihiroshima, 724Japan
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Summary

Ten dairy cows were allocated into three groups according to milk productivity (four high, four intermediate and two dry cows, respectively). Heat production and heart rate, but not rectal temperature, were significantly different (P < 0·05) between groups. Heat production increased during feeding in the morning and in the afternoon and reached a peak 3 h later. Minimum heat production was observed in the early morning before feeding. The diurnal pattern for heart rate reflected that of heat production. These results suggest that cooling dairy cows during hot summer days is most effective at feeding time and 3 h afterwards.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 114 , Issue 2 , April 1990 , pp. 139 - 142
Copyright
Copyright © Cambridge University Press 1990

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