STUDIES ON VARIATION IN MILK PRODUCTION AND IT’S CONSTITUENTS DURING DIFFERENT SEASON, STAGE OF LACTATION AND PARITY IN GIR COWS
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Date
2017-03-03
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Dau Shri Vasudev Chandrakar Kamdhenu Vishwavidyalaya Durg
Abstract
The present study was conducted to determine major milk constituents of Gir
cows and to find out the effects of season, stage of lactation and parity on major milk
constituents. Data were generated from 42 Gir cows and 683 milk samples which
were analysed at 10 days interval for a period of 6 months from December 2016 to
May 2017. The overall means for fat, solid not fat, protein, lactose and total solids
were found as 4.399 ± 0.018, 8.632 ± 0.021, 3.173 ± 0.011, 4.582 ± 0.015 and 13.031
± 0.028 percent, respectively. The effect of season was significant (P<0.01) for all the
major milk constituents. Stage of lactation had significantly affected fat, SNF, protein,
and total solids percentage whereas the parity was significant (P<0.01) on fat and total
solids content of milk. The overall mean for test day milk yield was found to be 5.290
± 0.081 kg. The effect of season, stage of lactation and parity were found to be highly
significant (P<0.01) on test day milk yield. Test day milk yield was found negatively
correlated with fat and total solids contents of milk. Highly significant (P<0.01) and
positive correlation between fat, solid not fat, lactose and total solids of milk. The
overall means for lactation yield, lactation length, peak yield and days to attain peak
yield were found to be 1505.997 ± 37.621 kg, 254.989 ± 1.873, 6.162 ± 0.229 and
33.395 ± 1.351 days, respectively. The effect of season of calving was found to be
significant for lactation yield, peak yield and days to attain peak yield. Lactation order
had significant effect on lactation yield and peak yield whereas the age at first calving
was significant on peak yield only.