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Reproduction In Range Sheep

United States Department of Agriculture

Abstract

A study has been made of reproduction in range sheep involving the records of breeding and lambing for nearly 8,000 matings over a period of 10 years at the U. S. Sheep Experiment Station, Dubois, Idaho. This study was undertaken to provide data on the normal reproductive rate of these sheep and to determine the influence of factors such as age, methods of management, feed conditions, etc., upon reproduction in sheep kept under range conditions.

The rate of reproduction is one of the chief limiting factors to selection in breeding for improvement and must be taken into consideration in plans for selection and mating. Determination of the influence of various environmental factors upon reproduction is basic to the development of methods for increasing fertility or maintaining high fertility.

Material and Methods

Breeding and lambing records of Rambouillet, Corriedale, Columbia, and Targhee ewes bred in pens at the U, S. Sheep Experiment Station to known sires for the 10-year period from 1929 to 1938 have been analyzed.

^* Acknowledgement is made to D. A. Spencer, W. A. Denecke, John M. Cooper, and Stanley L. Smith for assistance in collection of the data used.