J. Anim Sci.
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J. Anim Sci. 1966. 25:460-464.
© 1966 American Society of Animal Science
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Productivity of Farm Flock Ewes in Relation to Body Size

C. W. Nichols and J. V. Whiteman

Oklahoma Agricultural Experiment Station1, Stillwater

Abstract

Lifetime records of body weights, condition scores and production measures of 164 ewes were analyzed to study the associations of yearling weight, average lifetime weight, average lifetime condition score and average lifetime weight adjusted for condition score with average lifetime grease fleece weight, total number of lambs born, total number of lambs raised, average 70-day weight of lambs raised and average 70- to 140-day gain of the lambs raised.

The correlations between yearling weight and the lifetime production measures were positive and nonsignificant except for a significant (P<.05) correlation of 0.16 with average grease fleece weight. Average lifetime weight was positively correlated with average grease fleece weight (r=0.27, P<.01), total number of lambs born (r=0.11), total number of lambs raised (r=0.04), average 70-day lamb weight (r=0.20, P<.05) and average lamb gain from 70 to 140 days of age (r=0.24, P<.01). When average lifetime weight was adjusted to a constant condition score, these correlations increased to 0.32 (P<.01) with average grease fleece weight, 0.14 with total number of lambs born, 0.09 with total lambs raised, 0.09 with average lamb birth weight, 0.24 (P<.01) with average 70-day lamb weight and 0.28 (P<.01) with average lamb gain from 70 to 140 days of age. Average lifetime condition score was negatively and nonsignificantly correlated with measures of lifetime production. The regressions of lifetime production measures on the measures of ewe body size were very small, indicating that larger ewes actually produced only slightly more kilograms of lamb and wool during their lifetime than did the smaller ewes.

Footnotes

1 Department of Animal Science in cooperation with the AHRD, ARS, U. S. Department of Agriculture.






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Copyright © 1966 by the American Society of Animal Science.