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Yearly Differences in Growth of Navajo and Crossbred Ewe Lambs

United States Department of Agriculture¹

Abstract

Groups of Navajo and crossbred ewe lambs raised at the Southwestern Range and Sheep Breeding Laboratory, Fort Wingate, N. Mex., have been weighed at intervals of four weeks from birth to 20 weeks of age each year from 1938 to 1941, inclusive.

A comparison of the weights of the two groups of lambs showed that the crossbreds varied more than the Navajos from year to year at all ages. From the analysis of variance the percent of total variation in weight due to differences between years was determined. From 4 to 20 weeks of age this averaged 14.2 percent for the Navajos, and 37.4 percent for the crossbreds. The reasons for this difference in reaction to the environment are discussed.

¹ This study was conducted at the Southwestern Range and Sheep Breeding Laboratory, Fort Wingate, N. Mex., under authority of the Bankhead-Jones Act, in cooperation with the Office of Indian Affairs, United States Department of the Interior.

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