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US Department of Agriculture4, Miles City, MT 59301 and and Montana Agricultural Experiment Station, Bozeman 59717, cooperating
Abstract
Sixty-two, 2-yr-old heifers and 65 cows, 4 to 7 yr old, were assigned randomly at 60 d before the median predicted calving date to a factorially designed study. Main effects were: age of dam (heifer or cow), moderate (M) or high (H) precalving feed level (110 or 135% of National Research Council recommendation) and short (S) or prolonged (P) duration of Stage II of parturition. After calving, all dams were placed in the same range pastures and received supplemental hay and a grain-salt mix until adequate range forage was available to produce weight gains in the lactating dams. Dams were bred in a 45-d artificial insemination period. Calving difficulty scores and duration of labor (Stage II) were greater (both P<.01) in heifers than in cows; calf birth weight (P<.01), calf vigor at birth (P<.05) and calf gains birth to weaning (P<.01) were higher in cows. Effect of gestation feed level on precalving, calving and postpartum data were nonsignificant. Eighty-two precent of the S females were given obstetrical assistance and 15% of the P females required assistance at parturition (P<.01). More S dams exhibited estrus by the beginning of the breeding season than P dams (91.4 vs 81.7%, P<.10), and October pregnancy of S dams was higher than P dams (89.5 vs 75.6%, P<.05). Interaction effects of dam x duration of Stage II were not significant, but short duration of labor had beneficial effects on postpartum reproduction in both dam age groups. Results of this study indicate prolonged labor may result in depressed subsequent reproduction in beef dams.
1 This study was conducted as a contribution to Western Regional Project W-112, Improving Reproductive Performance in Cattle and Sheep. The paper is published with the approval of the Director of the Montana Agr. Exp. Sta., Journal Series No. 1308.
2 Present address: Northern Agr. Res. Center, Havre, MT 59501.
3 Dept. of Anim. and Range Sci., Montana State Univ., Bozeman, MT 59717.
4 Livestock and Range Research Station.
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