Effects of Calf Value and Reproductive Management on Optimum Days to First Breeding
作者： J.I. Weller , Y. Folman
DOI: 10.3168/JDS.S0022-0302(90)78798-X
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摘要: Abstract The effect of days open and to first breeding on cumulative calf milk production in the current following lactation was studied based annualized yield 121.627 Israeli-Holstein lactations. Optimum for parity ranged from 110 low value (500kg milk) 91 high (4000kg milk). second 40 value. Expected as a function computed probability conception, which varied .4 .6, estrus detection, .5 .7. reproductive management 95 65 d 77 less than parity. higher with lower better management. losses early (40 milk), compared optimum, up 780kg FCM cows, while expected late (120 790kg cows.
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