J. Anim Sci.
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J. Anim Sci. 1987. 65:16-32.
© 1987 American Society of Animal Science
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Growth Traits and Composition of Two- and Three-Way-Cross Intact Male Progeny of Bos Taurus and Bos Indicus x Bos Taurus Dams1

Karen M. Van Ornum2, Curtiss M. Bailey3,4,, Thomas P. Ringkob4 and Young O. Koh5

University of Nevada, Reno 89557

Abstract

Feedlot traits, carcass traits and distribution of commercial cuts of crossbred intact male progeny (n=556) from young and mature Hereford, Red Poll, Hereford x Red Poll, Red Poll x Hereford, Angus x Hereford, Angus x Charolais, Brahman x Hereford and Brahman x Angus dams were evaluated. First-calf heifers were bred to Red Angus bulls; Santa Gertrudis sires were used for each cow's second and third breeding seasons. Calves from these young dams were slaughtered at 13 mo. Calves of mature dams were all sired by Limousin bulls and slaughtered at 12 mo. Dam breed was a major source of variation in most bull traits. Progeny of Brahman-cross dams were inferior (P<.01) in daily gain, final weight, carcass weight and in edible cuts/day of age compared with progeny from Bos taurus dams. Intact male progeny of Angus x Charolais dams ranked highest in longissimus area, cutability, and edible cuts/day of age. The range of dam breed means in percentage of steak, roast, bone-in cuts (chuck short ribs and back ribs), short plate and thin cuts, and lean trim was just over 1%. Greater variation among dam breeds existed in fat measurements. Analyses in which Hereford-Red Poll diallel data for young dams and mature dams were combined showed positive maternal heterosis for dressing percentage (P<.05), carcass weight (P<.05), carcass weight/day of age (P<.05), estimated carcass fat (P<.05), fat thickness (P<.01) and marbling score (P<.01). Reciprocal effects were inconsequential. Results illustrate the importance of dam breed-type effects in formulating breeding strategies for commercial beef herds.

Footnotes

1 Appreciation is expressed to Edward Dunn and Gary Fellwock, Meats Lab., and Don Albert, Anim. Res. and Ext. Center Supervisor, for assistance.

2 Data from this study were used by the senior author in a thesis that was submitted in partial fulfillment of the requirements for the M.S. Degree.

3 Address reprint requests to this author.

4 Anim. Sci. Dept.

5 Statistical Consultant, Graduate School, Univ. of Nevada, Reno.






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Copyright © 1987 by the American Society of Animal Science.