J. Anim Sci.
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J. Anim Sci. 1975. 41:16-22.
© 1975 American Society of Animal Science
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Phenotypic Relationships within Angus and Hereford Females. I. Heifer Growth and Subsequent Cow Productivity1

Andrew C. Boston2, J. V. Whiteman and R. R. Frahm

Oklahoma State University, Stillwater 74074

Abstract

For Angus and Hereford, respectively, weaning weights of 2,030 and 548 calves and of their 573 and 162 dams, along with 425-day yearling weights of 427 and 144 of the dams, were used to estimate within breed the merit of heifer weaning and yearling weights as indicators of subsequent cow productivity (first 10 possible progeny weaning weights, their mean and most probable producing ability). Phenotypic relationships of weights and herd-year ratios were estimated by product-moment correlations obtained from nested cross-product analyses involving herds, cow birth years and cows.

Ninety-two percent of the Angus and 100% of the Hereford correlations were positive. For those involving heifer weaning and yearling weights, respectively, 33 and 54% of the Angus and 55 and 45% of the Hereford values were significant (P<.05). Correlations of mean progeny weaning weight and of progeny weaning weights of 2- and 10-year-old dams with (a) heifer weaning weight were .15 (P < .01), .13 (P < .01) and –.02 for Angus and .20 (P < .01), .19 (P < .05) and .21 for Hereford and (b) heifer weaning weight were .15 (P<.01), .13 (P<.01) and –.02 for Angus and .20 (P<.01), .19 (P<.05) and .21 for Hereford and (b) heifer yearling weight were .19 (P<.01), .15 (P<.01) and –.01 for Angus and .29 (P<.01), .30 (P<.01) and .10 for Hereford, respective-weaning and yearling weights were nonsignificant.

Footnotes

1 Journal Article 2816 of the Agricultural Experiment Station, Oklahoma State University, Stillwater. This research was conducted in cooperation with the U.S.D.A., Agricultural Research Service, Southern Region.

2 Present address: Department of Animal Science, Louisiana State University, Baton Rouge 70803.






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Copyright © 1975 by the American Society of Animal Science.