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The Reproductive History of the Stud at the United States Morgan Horse Farm from 1928 to 1938^*

United States Department of Agriculture

Abstract

A knowledge of the normal reproductive physiology of the horse is necessary as a background for studies designed to improve the reproductive capacity of this species. Data on the normal reproductive processes give a picture of the variation that may be expected in these processes and hence furnish a yardstick by which other studies can be measured.

It is the purpose of this paper to give the results of such studies as accumulated on the stud at the U. S. Morgan Horse Farm from 1928 to 1938.

Material

Each year during the period between 1928-1938 data were kept on such things as number of services required to settle each mare, total number of mares settled, birth weight of foals, duration of gestation, and the sex of offspring. It is on these records that this study is based. A total of 43 mares were bred during this period totaling 223 mare breeding seasons, and 150 foals resulted.

^* These data were collected under the direction of E. B. Krantz and J. O. Williams, superintendents of the U. S. Morgan Horse Farm during this period.