Postweaning performance and carcass merit of F1 steers sired by Brahman and alternative subtropically adapted breeds.
Comparisons were made among F1 steers sired by Brahman and alternative subtropically adapted breeds of bulls for feedlot and carcass traits when steers were produced from Angus- and Hereford-type dams. Brahman-derivative breeds included Brangus, Beefmaster, and Santa Gertrudis. Brangus- and Beefmaster-sired steers weighed less at slaughter, whereas carcasses of Brangus- and Santa Gertrudis-sired steers had more marbling than those of Brahman-sired steers. Brahman-sired steer carcasses had greater longissimus muscle area than carcasses of Santa Gertrudis-sired steers. Other Zebu breeds compared to Brahman were Boran, Gir, Indu-Brazil, Nellore, Red Brahman, and Sahiwal. Steers by Brahman sires had higher slaughter weights than steers by Boran, Gir, Nellore, or Sahiwal sires. Hot carcass weights of Brahman-sired steers were also higher than those of Boran- and Sahiwal-sired steers. Steer carcasses by Brahman sires had greater longissimus muscle area than those of steers by Sahiwal sires. Non-Zebu breeds included Tuli and Senepol. Steers by Tuli sires grew slower, had lower slaughter weights, and their carcasses weighed less than those of Brahman-sired steers. Brahman-sired steer carcasses had greater longissimus muscle area but less marbling than carcasses of Tuli-sired steers. These data suggest that steers by Brahman sires have an advantage for slaughter weight over steers by Brangus, Beefmaster, Boran, Gir, Nellore, Sahiwal, and Tuli sires, but their carcasses are at a disadvantage for marbling score compared with those by Brangus, Boran, Nellore, and Tuli sires.
Franke
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Louisiana State University Agricultural Center, Baton Rouge 70803, USA.
D000222:Adaptation, Physiological / Q000502:physiology*; D000375:Aging / Q000502:physiology*; D000818:Animals; D001823:Body Composition / Q000235:genetics* / Q000502:physiology; D001947:Breeding; D002417:Cattle / Q000235:genetics* / Q000254:growth & development* / Q000502:physiology; D005260:Female; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology; D014329:Tropical Climate; D014886:Weaning; D015430:Weight Gain / Q000235:genetics / Q000502:physiology