J. Anim Sci.
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J. Anim Sci. 1982. 54:618-624.
© 1982 American Society of Animal Science
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Mineral Accretion during Prenatal Growth of Cattle1

C. L. Ferrell, D. B. Laster and R. L. Prior

US Department of Agriculture2, Clay Center, NE 68933

Abstract

Angus, Hereford and Red Poll crossbred yearling heifers (n = 81) were mated to Brown Swiss bulls. Pregnant heifers were assigned on the bases of weight and breed cross to one of three diets and fed to achieve maternal weight gains of 0, .5 or 1.0 kg/d. Heifers from each treatment group were slaughtered at about 120, 150, 180, 210, 240 or 255 d postmating. Reproductive tracts were recovered at slaughter. Weights of the gravid uterus, fetus, fetal membranes, fetal fluids, uterus, cotyledons and placenta were obtained and have been reported previously. Fetuses were frozen and later ground, mixed and sampled. Dry matter was determined. Samples of each fetus were ashed, arid concentrations of Ca, P, Na, K, Mg, Fe and Zn were determined. Relationships between total fetal content of each mineral and day postmating were obtained, and daily fetal accretion rates of each mineral were estimated for several stages of gestation. Daily requirements and allowances of each mineral for pregnancy in beef cows were estimated. Estimated allowances for Ca, P, Na, K, Fe and Zn were small during early gestation but increased rapidly and reached maxima of 8.4 g, 5.2 g, .76 g, .63 g, 65 mg and 21 mg, respectively, at about 250 d postmating.

Footnotes

1 Cooperation of the Nebraska Agr. Exp. Sta., Univ. of Nebraska, Lincoln, is acknowledged.

2 SEA, ARS, Roman L. Hruska US Meat Animal Research Center. Mention of trade name, proprietary product, or specific equipment does not constitute a guarantee or warranty by die USDA and does not imply its approval to the exclusion of other products that may be suitable.






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Copyright © 1982 by the American Society of Animal Science.