Some factors affecting total milk yield and service per conception and estimated breeding value with sex ratio of Holstein Friesian cows in central Iraq
ANBAR JOURNAL OF AGRICULTURAL SCIENCES,
2009, Volume 7, Issue 4, Pages 277-289
AbstractA total of 2718 records belong to 1126 Holstein Friesian cows which divided to 911 cows in Al-Nasr station for dairy cattle and 215 cows in Al-Ishaky station for the period of 1994-2003 which they are daughters of 28 bulls in Abu-Ghraib Artificial Insemination Center . Total milk yield (TMY), service per conception (S/C), and sex ratio (SR) were studied.
البحث مستل من رسالة ماجستیر للباحث الثانی
The overall mean ± SE for TMY and S/C were 3774.11 ± 28.80 kg and 2.02 ± 0.03 insemination respectively. TMY was highly significant affected by herd , parity , season and year of calving , while age at first calving showed no significant effect on production. S/C was affected significantly (P 0.01) for all factors which mentioned previously. The statistical analysis showed a lack of significant differences between male and female births, with the mean ratio of 53.1 : 46.9 for 3033 births in two stations , but for the bull No. 543 (SR) was 67.8 : 32.2 (P 0.01).
The breeding value for bulls which used A.I. center for TMY ranged between – 590 to 539.1 kg and for S/C ranged between – 0.384 to 0.450 insemination.
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