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Nutrient Requirements of Beef Cattle: Seventh Revised Edition, 1996
may become less willing and able to inseminate females. Specific nutrient deficiencies may result in lowered physical ability to mate in addition to specific effects noted by Hurley and Doane (1989).
It should be noted that the negative effects of malnutrition are more evident in the young male than in older animals. The mature male is remarkably resistant to nutritional stress, and infertility problems of nutritional origin are not often encountered. Both young and mature males frequently lose weight during the breeding season resulting from both decreased food consumption and substantially increased physical activity. Thus, bulls should be in good body condition at the beginning of the breeding season to provide energy and protein reserves for use during breeding.
Agricultural and Food Research Council. 1990. Nutrient Requirements of Ruminant Animals: Energy. Nutr. Abstr. Rev. Ser. B 60:729–804.
Agricultural Research Council. 1980. The Nutrient Requirements of Ruminant Livestock: Technical Review. Farnham Royal, U.K.: Commonwealth Agricultural Bureaux.
Alexander, G. 1964a. Studies on the placenta of the sheep (Ovis aries L.): Placental size. J. Reprod. Fertil. 7:289–305.
Alexander, G. 1964b. Studies on the placenta of the sheep (Ovis aries L.): Effect of surgical reduction of the number of caruncles. J. Reprod. Fertil. 7:307–322.
Alexander, G., and D.Williams. 1971. Heat stress and development of the conceptus in domestic sheep. J. Agric. Sci., Camb. 76:53–72.
Andersen, H., and M.Plum. 1965. Gestation length and birth weight in cattle and buffaloes: A review. J. Dairy Sci. 48:1224–1235.
Arnett, D.W., G.L.Holland, and R.Totusek. 1971. Some effects of obesity in beef females. J. Anim. Sci. 33:1129–1136.
Bartle, S.J., J.R.Males, and R.L.Preston. 1984. Effect of energy intake on the postpartum interval in beef cows and the adequacy of the cows milk production for calf growth. J. Anim. Sci. 58:1068–1074.
Bassett, J.M. 1986. Nutrition of the conceptus: Aspects of its regulation. Proc. Nutr. Soc. 45:1–10.
Bassett, J.M. 1991. Current perspectives on placental development and its integration with fetal growth. Proc. Nutr. Soc. 50:311–319.
Battaglia, F.C. 1992. New concepts in fetal and placental amino acid metabolism. J. Anim. Sci. 70:3258–3263.
Beal, W.E., D.R.Notter, and R.M.Akers. 1990. Techniques for estimation of milk yield in beef cows and relationships of milk yield to calf weight gain and postpartum reproduction. J. Anim. Sci. 68:937–943.
Beef Improvement Federation. 1990. Guidelines for Uniform Beef Improvement Programs, 6th Ed. Stillwater, Okla.: Oklahoma State University, Beef Improvement Federation.
Bell, A.W. 1987. Consequences of severe heat stress for fetal development. Pp. 313–333 in Heat Stress: Physical Exertion and Environment, J.R.S.Hales and D.A.B.Richards, eds. Amsterdam: Elsevier/North Holland.
Bell, A.W., J.M.Kennaugh, F.C.Battaglia, E.L.Makowski, and G. Meschia. 1986. Metabolic and circulatory studies of fetal lambs at mid-gestation. Am. J. Physiol. 250:E538–E544.
Bell, A.W., B.B.Wilkening, and G.Meschia. 1987. Some aspects of placental function in chronically heat stressed ewes. J. Develop. Physiol. 9:17–29.
Bellows, R.A., and R.E.Short. 1978. Effects of precalving feed level or birth weight, calving difficulty and subsequent fertility. J. Anim. Sci. 46:1522–1528.
Bellows, R.A., D.J.Patterson, P.J.Burfening, and D.A.Phelps. 1987. Occurrence of neonatal and postnatal mortality in range beef cattle. II. Factors contributing to calf death. Theriogenology 28:573–586.
Bellows, R.A., R.E.Short, G.P.Kitto, R.B.Staigmiller, and M.D. MacNeil. 1990. Influence of sire, sex of fetus and type of pregnancy on conceptus development. Theriogenology 34:941–954.
Boggs, D.L., E.F.Smith, R.R.Shalles, B.E.Brent, L.R.Corah, and R.J.Pruitt. 1980. Effects of milk and forage intake on calf performance. J. Anim. Sci. 51:550–553.
Bowden, D.M. 1981. Feed utilization for calf production in the first lactation by 2-year-old F1 crossbred beef cows. J. Anim. Sci. 51:304–315.
Bratton, R.W., S.D.Musgrove, H.O.Dunn, and R.H.Foote. 1959. Causes and prevention of reproductive failures in dairy cattle. II. Influence of underfeeding and overfeeding from birth to 80 weeks of age on growth, sexual development and semen production of Holstein bulls. Bull. No. 940. Ithaca, N.Y.: Cornell University Agricultural Experiment Station.
Burns, W.C., M.Koger, W.T.Butts, O.F Pahnish, and R.L.Blackwell. 1979. Genotype by environmental interaction in Hereford cattle. II. Birth and weaning traits. J. Anim. Sci. 49:403–409.
Butson, S., and R.T.Berg. 1984a. Lactation performance of range beef and dairy beef cows. Can. J. Anim. Sci. 64:253–265.
Butson, S., and R.T.Berg. 1984b. Factors influencing lactation performance of range beef and dairy-beef cows. Can. J. Anim. Sci. 64:267–277.
Butts, W.T., M. Koger, O.F.Pahnish, W.C.Burns, and E.J.Warwick. 1971. Performance of two lines of Hereford cattle in two environments. J. Anim. Sci. 33:923–932.
Cartwright, G.A., and C.J.Thwaites. 1976. Foetal stunting in sheep. 1. The influence of maternal nutrition and high ambient temperature on the growth and proportions of Merino fetuses. J. Agric. Sci. Camb. 86:573–580.
Chenette, C.G., and R.R.Frahm. 1981. Yield and composition of milk from various two-breed cross cows. J. Anim. Sci. 52:483–492.
Christian, L.L., E.R.Hauser, and A.B.Chapman. 1965. Association of preweaning and postweaning traits with weaning weight in cattle. J. Anim. Sci. 24:652–659.
Clutter, A.C., and M.K.Nielson. 1987. Effect of level of beef cow milk production on pre- and postweaning calf growth. J. Anim. Sci. 64:1313–1322.
Collier, R.J., S.G.Doelger, H.H.Head, W.W.Thatcher, and C.J. Wilcox. 1982. Effects of heat stress during pregnancy on maternal hormone concentrations, calf birth weight and postpartum milk yields in postpartum cows. J. Anim. Sci. 54:309–319.
Commonwealth Scientific and Industrial Research Organization. 1990. Feeding Standards for Australian Livestock: Ruminants. East Melbourne, Victoria, Australia: CSIRO Publications.
Corah, L.R., T.G.Dunn, and C.C.Kaltenbach. 1975. Influence of prepartum nutrition on the reproductive performance of beef females and the performance of their progeny. J. Anim. Sci. 41:819–824.
Coulter, G.H., and G.C.Kozub. 1984. Testicular development, epididymal sperm reserves and seminal quality in two-year-old Hereford and Angus bulls: Effects of two levels of dietary energy. J. Anim. Sci. 59:432–440.
Cundiff, L.V., R.M.Koch, and K.E.Gregory. 1988. Pp. 3–4 in Germ plasm evaluation in cattle. Beef Progress Report No. 3. USDA-ARS-71. Washington, D.C.: U.S. Department of Agriculture.
Cundiff, L.V., K.E.Gregory, F.J.Schwulst, and R.M.Koch. 1974. Effects of heterosis on maternal performance and milk production in Hereford, Angus, and Shorthorn cattle. J. Anim. Sci. 38:728–745.
Daley, D.R., A.McCuskey, and C.M.Bailey. 1987. Composition and