COMPARATIVE PERFORMANCE OF FIRST LACTATIONAL TRAITS IN JERSEY X RED SINDHI AND FRIESIAN X RED SINDHI
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Date
1992
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Mahatma Phule Krishi Vidyapeeth, Rahuri.
Abstract
The present study entitled, "Comparative performance of
first lactational traits in Jersey X Red Sindhi and Friesian X
Red Sindhi", was undertaken at the Agricultural College Dairy
Farm, Pune. Data on fifty eight Red.Sindhi halfbred cows from
1974 to 1988 were collected and analysed to study the
reproduction, production and prod uction efficiency traits. The
least squares analysis (Harvey, 1966) was carried out to assess
the influence of genetic group, period of calving and season of
calving on said traits.
Correlations between economically important traits were
studied. Prediction equations were developed to predict full milk yield, 300 days milk yield, daily milk yield per 300 days,
daily milk yield per lactation length and daily milk yield per
calving interval.
The least-squares means for age of first calving
(days), full milk yield (kg), 300 days milk yield (kg), lactation
length (days), calving interval (days), daily milk yield per 300
days (kg), daily milk yield per lactation length and daily milk
yield per calving interval were 1059.05 (days), 2623.84 (kg),
2144.54 (kg), 360.71 (days), 380.27 (days), 7.22 (kg), 7.20 (kg)
and 5.77 (kg) for FRS, these figures were 1007.99 (days), 2705.12
(kg), 2094.28(kg), 394.14 (days), 384.51 (days), 6.98 (kg), 6.89
(kg) and 5.70 (kg) for JRS.
Period of calving exerted significant influence on age
at first calving in FRS and DMY/300 days, DMY/LL and DMY/CI in
JRS. Season of calving did not show significant influence on any
trait under study. Both genotypes differed significantly for
lactation length.
In multiple regression of birth weight and age at first
calving on full milk yield, 300 days milk yield, daily milk
yield/300 days, daily milk yield/lactation length and daily milk
yield/calving interval, all partial regression coefficients were
non-significant in Friesian x Red Sindhi and Jersey x Red Sindhi.
Accuracy of predictability of said traits was ranged from 5.00 to
51.00 per cent in both genotypes.
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