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Influence of environmental adjustments on heritability of weaning weight of range Rambouillet lambs



Influence of environmental adjustments on heritability of weaning weight of range Rambouillet lambs



Jour Animal Sci 21(1): 91-94



The least squares procedure was used to estimate the importance of factors affecting weaning weight of range Rambouillet lambs. Male lambs grew 7.2% faster than females. Single lambs weighed 4.6% more than twins raised as singles and 10% more than twin lambs raised as twins. Lambs out of 2-year old dams weighed 5.1 lbs. or 8% less than lambs out of mature ewes (3 through 7 years). Very old ewes weaned lambs weighing 7.6 lbs. or 11.7% less than ewes in their years of peak production. Heritability of weaning weight was estimated at 13.8% using unadjusted values. The extent to which the calculated heritability could be increased by various methods of adjustments and calculations is reported. Correction for age of lamb made the greatest improvement. In this study it was found that the use of a pooled regression coefficient (0.30 lbs. per day) gave results comparable to other procedures used.

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Accession: 014079591

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