REPRODUCTIVE PERFORMANCE OF COWS UNDER HOMOEOTHERMAL DISTURBANCES
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Date
1995
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COLLEGE OF VETERINARY AND ANIMAL SCIENCE,MANNUTHY
Abstract
Based on the data on the maximum, minimum temperature
and humidity for a period of two years, a year of study was
divided into four seasons of JJA, SON, DJF and MAM. The mean
maximum environmental temperature of the seasons were 29.56,
31.52, 32.73 and 34.88°C respectively.
Two thousand two hundred and ninety eight cows brought
to the AX centre from the homesteads of Mannuthy were
grouped into 11 treatments of pre and post insemination rests
and no rests. They were bred by artificial insemination and
results of insemination were assessed on the basis of
non-return. Mean conception rate of the seasons were
statistically analysed to know the effect of environmental
temperature and the effect of pre and post insemination rests
to the animals. There was no significant difference in
conceptions between seasons, between the post insemination
rests and no rests and between pre insemination rests of 30
and 60 minutes and no rest. Conception per cent was
icantly higher in the animals those were given pre
insemination rest for 90 and 120 minutes.
Animals with light coat colour had a significantly
higher conception rate than those with dark colour
irrespective of the seasons. Animals inseminated in the
afternoon were generally found to have a better conception
rate than those inseminated in the forenoon. There was no
significant difference in the conception rate of heifers and
cows both between seasons and between themselves. So also,
there was no significant difference in conception rate of
parity groups both between seasons and between themselves.
Statistical analysis of seasonal mean weight of foetal
membranes, mean number of cotyledons and mean area of
cotyledons and mean birth weight of calves did not show any
correlation to suggest influence of seasonal environmental
temperature on placental development and birth weight of
calves.
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