J. Anim Sci.
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J. Anim Sci. 1970. 30:174-181.
© 1970 American Society of Animal Science
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Heritabilities and Genetic Correlations in Growth and Wool Traits of Rambouillet and Romnelet Sheep1,2,

J. A. Vesely3, H. F. Peters4, S. B. Slen5 and O. W. Robison6

Canada Department of Agriculture, Lethbridge and North Carolina State Univerity, Raleigh

Abstract

Data on 1522 Rambouillet and Romnelet lambs from 75 sires were used. The traits studied were: birthweight (BW), weaning weight (WW), grease and clean fleece weight (GF, CF), staple length (SL), wool grade (WG), wool yield (WY), average daily gain and total gain (ADG, TG), feed efficiency (FE) and final weight (FW). TG and FE were obtained from a 126-day postweaning test. Least squares analyses were used to estimate the effects of year, age of dam, sex, type of rearing, sires and regression of birth weight on birthdate, or of weaning weight and post-weaning traits on age at weaning or of wool traits on age at shearing. Estimates of genetic parameters were obtained for each breed from paternal half-sib analysis. The heritability estimates for the two breeds were in close agreement except for WG (Rambouillet, 0.10, Romnelet, 0.45). Moderate heritabilities were obtained for BW (0.30, 0.28), GF (0.31, 0.29), CF (0.23, 0.37), SL (0.25, 0.39), TG (0.23, 0.22) and FW (0.26, 0.03).

Footnotes

1 Paper No. 2859 of the Journal Series of the North Carolina State University Agricultural Experiment Station, Raleigh.

2 Computing services for this investigation were supported by Public Health Services Grant FR-00011.

3 Research Station, Canada Department of Agriculture, Lethbridge, Alberta; at present graduate student at North Carolina State University, Raleigh.

4 Animal Institute, Canada Department of Agriculture, Ottawa, Ontario.

5 Research Station, Canada Department of Agriculture, Lethbridge, Alberta.

6 Department of Animal Science, North Carolina State University, Raleigh.






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Copyright © 1970 by the American Society of Animal Science.