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Oestrus cycle of jennets and sperm production of jacks^*

Mississippi Agricultural Experiment Station

Abstract

Production of locally bred and raised jackstock has created considerable interest among breeders in Mississippi. Since very little is known about the actual breeding habits of jacks and jennets, a study of their physiology of reproduction was included in the research program of this de-partment. In 1938, observations were made on 10 jennets belonging to the Mississippi Experiment Station for symptoms and characteristics of estrus, similar to observations made on mares by McKensie and Andrews (1937). Some additional data were collected on 4 outside jennets. The data on 2 jacks also were collected during the routine breed' ing work for jackstock and mule production.

Eight jennets were in foal at the beginning of the experiment while 2 were open. The jennets were teased (checked for heat) with one of the jacks. When in heat most of them show marked physical signs that are typical for jennets. As soon as brought close to the jack, they would begin chewing movements with the mouth, sometimes holding it open as in a yawn.

^* Contribution from the Department of Animal Husbandry, Mississippi Agricultural Experiment Station, State College, Mississippi. Published with the approval of the Acting Director, Mississippi Agricultural Experiment Station. Paper No. 4 New Series, November 9, 1938.