Timing of onset of somatotropin supplementation on reproductive performance in dairy cows

Journal of Dairy Science
W J SilviaT B Hatler

Abstract

The objective of this field trial was to determine whether delaying the start of recombinant bovine somatotropin (rbST) supplementation from 9 to 10 wk postpartum to 17 to 18 wk postpartum would improve reproductive performance in lactating dairy cows. Cows from nine herds (n = 798 cows; 766 Holsteins, 32 Jerseys) were assigned at random to receive rbST supplementation at 14-d intervals beginning during wk 9 to 10 (n = 399) or wk 17 to 18 (n = 399) after calving. Effects of herd, season of calving, parity, and onset of rbST supplementation (9 to 10 wk vs. 17 to 18 wk) on days to first service and days open were determined. In primiparous but not multiparous cows, there tended to be fewer days to first service and fewer days open when onset of rbST supplementation was delayed. Percentages of cows pregnant at 150, 200, and 250 d postpartum were also examined. Time of onset of rbST did not affect percentages of multiparous cows pregnant at 150, 200, and 250 d postpartum. However, there appeared to be a slight tendency for percentages of pregnant primiparous cows to be greater at 200 and 250 d postpartum for those receiving rbST supplementation beginning at 17 to 18 wk compared to those receiving rbST starting at 9 to 10 wk. In con...Continue Reading

References

Dec 1, 1992·Journal of Dairy Science·D E Bauman
Jun 1, 1997·Journal of Dairy Science·L W Tauer, W A Knoblauch
Jan 12, 2000·Journal of Dairy Science·D E BaumanR J Collier
Jul 25, 2000·Journal of Dairy Science·J E Luna-DominguezR L Ax

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Citations

May 14, 2005·Archives of Animal Nutrition·Gerhard FlachowskyKaren Aulrich

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