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Projection of lactation milk yield from part records in crossbred dairy cows

Published online by Cambridge University Press:  01 June 2009

Sutej B. S. Yadav ,
Jai S. Sharma  and
Om P. Dutta
Sutej B. S. Yadav
Affiliation:
Department of Animal Breeding, Haryana Agricultural University, Hissar-125 004, India
Jai S. Sharma
Affiliation:
Department of Animal Breeding, Haryana Agricultural University, Hissar-125 004, India
Om P. Dutta
Affiliation:
Department of Animal Breeding, Haryana Agricultural University, Hissar-125 004, India
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Summary

First lactation records of a total of 242 Jersey (JH), Brown Swiss (BH) and Holstein-Friesian (FH) halfbreeds from Hariana cows were studied for projecting 300 d milk yield from 12,14,16,18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38 and 40 weeks’ milk yield. The correlation coefficients between 300 d milk yield and part records ranged from 0·84 to 0·9 in the JH, 0·80 to 0·90 in the BH and 0·72 to 0·86 in the FH groups. Prediction equations and standard errors of estimation for prediction of 300 d milk yield for an individual animal are presented. It is suggested that part records up to 16, 22 and 22 weeks may be used for projecting 300 d yield with sufficient accuracy in the JH, BH and FH groups respectively.

Type
Original Articles
Information
Journal of Dairy Research , Volume 51 , Issue 4 , November 1984 , pp. 525 - 530
Copyright
Copyright © Proprietors of Journal of Dairy Research 1984

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References

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