Total lifetime weight of lamb weaned and weight of wool produced per ewe of the original flock is a meaningful way of expressing the overall economic advantage in production from various breeds or production situations because it takes longevity into consideration. Longevity will have an impact on lifetime production. Very few accurate figures are available for attrition rates for various groups of ewes. It is reasonable to figure an overall reduction from culling and death of about 5% the first year and 10% per year thereafter. At least part of the breed or production system differences in cumulative lamb and wool production is dependent upon differences in longevity.
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South Dakota State University
Copyright © 1985 South Dakota State University
Busch, W. J. and Slyter, A. L., "Effects of Breed of Ewe and Management System on the Production of Lamb and Wool 4. Cumulative Production Per Ewe Entering the Study" (1985). South Dakota Sheep Field Day Proceedings and Research Reports, 1985. 9.