Calving intervals in beef cows at 2, 3, and 4 years of age when breeding is not restricted after calving.
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[1] D. Gibb,et al. Nutrient Requirements of Beef Cattle, 7th ed , 1997 .
[2] J. Kinder,et al. Weight changes prepartum and presence of bulls postpartum interact to affect duration of postpartum anestrus in cows. , 1992, Journal of animal science.
[3] R. Short,et al. Postpartum interval to estrus and patterns of LH and progesterone in first-calf suckled beef cows exposed to mature bulls. , 1990, Journal of animal science.
[4] R. Short,et al. Physiological mechanisms controlling anestrus and infertility in postpartum beef cattle. , 1990, Journal of animal science.
[5] M. D'Occhio,et al. Return to Cyclic Ovarian Activity Following Parturition in Mature Cows and First-calf Beef Heifers Exposed to Bulls , 1989 .
[6] K. Imakawa,et al. Influence of exposure to bulls on resumption of estrous cycles following parturition in beef cows. , 1984, Journal of animal science.
[7] C. Kaltenbach,et al. Nutrition and the postpartum interval of the ewe, sow and cow. , 1980, Journal of animal science.
[8] J. Lesmeister,et al. Date of First Calving in Beef Cows and Subsequent Calf Production , 1973 .
[9] B. M. Priode,et al. Effect of Calving Date on Subsequent Calving Performance , 1958 .