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The Effect of Rations Deficient in Phosphorus and Protein on Ovulation, Estrous, and Reproduction of Dairy Heifers^*

Divisions of Agricultural Biochemistry, Dairy Husbandry and Veterinary Medicine, Minnesota Agricultural Experiment Station

ABSTRACT

Conclusions: We conclude from this study that a combined deficiency of phosphorus and protein in the bovine, analogous to similar deficiencies in animals reared largely on prairie hay in the phosphorus deficient regions, delays sexual maturity, represses normal evidences of estrum so that periods of estrum appear to be missed, but does not interfere with normal regularity of ovulation or the ease of conception. The reduction in breeding efficiency noted in a previous experiment when phosphorus alone was deficient, was not observed in this study. The ease with which these undersized, miserable appearing specimens of the bovine species conceived when bred long after the normal age of first breeding and the normal vigor of the calves produced were definitely contrary to all expectations. However, the marked dystocia (mainly maternal) which occurred in four of the eight animals employed for the breeding study must be regarded as probably due in large measure to the dietary deficiencies imposed.

^* Published with the approval of the Director as Paper No. 1845, Scientific Journal Series, Minnesota Agricultural Experiment Station.

This article has been cited by other articles:

				H. Lopez, F. D. Kanitz, V. R. Moreira, L. D. Satter, and M. C. Wiltbank Reproductive Performance of Dairy Cows Fed Two Concentrations of Phosphorus J Dairy Sci, January 1, 2004; 87(1): 146 - 157. [Abstract] [Full Text] [PDF]