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Thermosensitivity of Bos indicus cattle and their F1, crosses with three breeds of Bos taurus

Published online by Cambridge University Press:  02 September 2010

Khub Singh  and
N. K. Bhattacharyya
Khub Singh
Affiliation:
Indian Veterinary Research Institute, Izatnagar-243 122, UP, India
N. K. Bhattacharyya
Affiliation:
Indian Veterinary Research Institute, Izatnagar-243 122, UP, India
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Abstract

Resting heat production (H), respiratory rate (RR) and rectal temperature (Tr) were measured at different controlled temperatures (Tt) in Hariana (Bos indicus) and its F, crosses with Jersey (JH), Brown Swiss (BH) and Holstein Friesian (FH) (Bos taurus) breeds and the values obtained were used to assess their relative thermosensitivity.

The lowest Tt at which H significantly decreased from that at 17°c was 32°c for Hariana, JH and BH and 27°c for FH after exposure for 8 days. The corresponding values after exposure for 18 days were 37°c for Hariana and 32°c for all the three crossbred groups. Differences between the genetic groups were also significant. The lowest Tt at which metabolizable energy (ME) decreased significantly in comparison with those at 17CC was 32°c in all the genetic groups. The differences in ME intake between genetic groups were significant only at 32°c Tt. The lowest Tt at which RR significantly increased from those at 17°c were 32°c in Hariana, 27°c in JH, BH and FH for both 5 to 7 and 15 to 17 days of exposure. The corresponding Tt for increase in Tr was 37°c in Hariana, 32°c in JH and 27°c in BH and FH at both 5 to 7 and 15 to 17 days of exposure.

The ambient temperature at which H would have significantly decreased and RR and Tr increased from the respective values at 17CC Tt were calculated curvilinearly for different genetic groups. There were differences in these values of calculated ambient temperatures between genetic groups and between exposure durations in respect of H, RR, and Tr, indicating differences in thermosensitivity.

Keywords

crossbredsheat tolerancezebu
Type
Research Article
Information
Animal Production , Volume 52 , Issue 1 , February 1991 , pp. 57 - 65
Copyright
Copyright © British Society of Animal Science 1991

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