Dr. S.K. ChourasiaDora, Suryam2024-02-272024-02-272017-03-03https://krishikosh.egranth.ac.in/handle/1/5810207144The 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.EnglishThesis