J. Anim Sci.
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J. Anim Sci. 1965. 24:388-391.
© 1965 American Society of Animal Science
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Relationships among Weights and Linear Measurements in Sheep and Heritability Estimates of some of These Measurements

E. Salah E. Galal1, T. C. Cartwright and Maurice Shelton

Texas A&M University,2 College Station

Abstract

Relationships among linear measurements and body weight were studied in approximately 1400 lambs. Measurements and weights studied were: metacarpus and metatarsus width and breadth, hook width, birth weight, adjusted 30-day weight and adjusted weaning weight. Simple correlations among these variables as well as multiple regressions of weaning weight and 30-day weight on the other variables are reported. Generally, birth weight was the most valuable for predicting weaning weight. Considering any linear measurements simultaneously with birth weight adds significant information, but the addition is too low to be practically useful. Sex, year, breeding-location and type of birth were significant sources of variation for all characters. Simple correlations between chilled carcass weight percent of live weight and the area of ribeye muscle were 0.00 and –.44 with metacarpus length, 0.80 and 0.51 with metacarpus lateral diameter, 0.46 and 0.51 with metacarpus anterior-posterior diameter, 0.31 and 0.37 with metatarsus lateral diameter, 0.32 and 0.57 with metatarsus anterior-posterior diameter and 0.44 and 0.71 with hook-bone width, respectively.

Heritabilities as estimated from offspring-dam regressions and correlations at birth were 0.46 and 0.38 for cannon length and 0.38 and 0.37 for the hook-bone width, respectively.

Footnotes

1 Present address: Department of Animal Science, Iowa State University, Ames, Iowa.

2 Thanks are due to Charles F. Parker for assisting in collecting and analyzing the data.






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Copyright © 1965 by the American Society of Animal Science.