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Vol. 11, Special Issue 6 (2022)

Accuracy of part yield in estimating lactation milk yield of Gir (Bos indicus) cows

Author(s):
Pravin N Chaudhari, Mahesh R Gadariya, Bhagavanji D Savaliya and Pratik S Kapadiya
Abstract:
Standard lactation milk yield (SLMY) was predicted by simple regression equation from weekly, fortnightly and monthly, individual and cumulative part yields in Gir cows. A total of 300 normal lactations of Gir cows from 1st to 6th parity with lactation length >210 days were utilized. Correlation coefficients between 305-day milk yield (SLMY) and different weekly (1st to 25th week), fortnightly (1st to 10th fortnight) and monthly (1st to 5th month), individual and cumulative part lactations were positive and significant (P<0.01) and showed increasing trend with advancement of lactation. Reliability of prediction for standard lactation milk yield (SLMY) was reasonably high, i.e., about 85% with 20th, 21st, 22nd or 24th week yield, 9th or 10th fortnight yield and 5th month part lactation yields. Individual part yields were found to be more reliable than cumulative respective (weekly, fortnightly and monthly) part yields for prediction of SLMY. WY14 or FNY7 milk yield as part lactation covered 78.18-79.85% of variation in SLMY in of Gir cows. R2 value of 72.26% for first 100-day milk yield as part lactation was quite reliable to determine production potential in terms of SLMY of Gir cows. However, considering 4th or 5th month (120 to 150-days) milk yield alone of the cows gave still higher reliability (R2, 82.27 to 87.40%) of SLMY.
Pages: 1749-1753  |  193 Views  51 Downloads
How to cite this article:
Pravin N Chaudhari, Mahesh R Gadariya, Bhagavanji D Savaliya and Pratik S Kapadiya. Accuracy of part yield in estimating lactation milk yield of Gir (Bos indicus) cows. The Pharma Innovation Journal. 2022; 11(6S): 1749-1753.

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