University of California

Some effects of varying calcium and phosphorus intake on the estrus cycle and reproduction in the rat


H. R. Guilbert
G. H. Hart

Authors Affiliations

H. R. Guilbert was Assistant Animal Husbandman in the Experiment Station; G. H. Hart was Professor of Animal Husbandry and Animal Husbandman in the Experiment Station.

Publication Information

Hilgardia 5(5):101-118. DOI:10.3733/hilg.v05n05p101. December 1930.

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Normal functioning of the genital tract of our domestic animals is of great economic importance. The regularity of the estrus cycle has been shown by Evans and Bishopv(1) to be a more delicate index of a sound physiology than is the growth curve alone. If the genital tract is to function normally, the food intake probably must be complete in all dietary essentials except for the limited period of time during which an animal may draw upon its reserves. The same factors are also involved in the rate of growth and of fattening on range feed of our food animals. Growth, fattening, and rate of reproduction vary greatly in different sections. The quantity and quality of the natural feed supply depends to a considerable extent upon the composition of the soil on which it is grown. Moisture and weather conditions and curing of grasses on the ground, with shattering of the seeds and processes involved in drying, bleaching, and possibly leaching, all have a bearing on the quality of the feed at the time it is utilized by the animal.

Literature Cited

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[9] Dutoit P. J., Bisschop J. H. R. The breeding of cattle of phosphorus deficient veld. 15th Annual Report of the Director of Veterinary Service, Union of South Africa. 1929. 2:1059-1166.

Guilbert H, Hart G. 1930. Some effects of varying calcium and phosphorus intake on the estrus cycle and reproduction in the rat. Hilgardia 5(5):101-118. DOI:10.3733/hilg.v05n05p101
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