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The rate of breeding and lambing and the length of gestation period of range ewes

Montana Agricultural Experiment Station

Abstract

The breeding and lambing records of 1472 grade Rambouillet ewes were secured during the years 1934–35, 1935–36 to study the rate of breeding and lambing and the length of gestation period of range ewes, and to determine what influence, if any, the breed of rams used might have on the points in question.

The herd was divided into two uniform groups at the beginning of the breeding season. One group was bred to Hampshire rams, the other to Rambouillets. The rams were painted on the breast when turned with the ewes, were herded with them during the day and corralled with them at night. At daylight each group was run through a sorting chute, the ear tag number of each ewe that had been bred during the twenty-four hour period recorded, the rams separated from the ewes, fed grain, painted and turned back on the range with their respective groups.

The rams were run with the ewes for thirty days each season.