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Birth to slaughter growth and carcass composition of Simmental-sired calves as influenced by birth season, pre-weaning stock rate, and sex
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Growth and carcass data were collected over 5 yr (I 984 through 1 988) from 53 5 1/2 Simmental x 1/4 Hereford x 1/4 Brahman calves (375 fall-bom and 160 winter-bom) reared at TAES-Overton under three different levels of forage mass (stocking rate) prior to weaning. After weaning, fall-bom cattle went to the feedlot (calves) or grazed bermudagrass as stockers (yearlings). All winter-born cattle grazed rye-ryegrassbermudagrass pastures as stockers (long-yearlings). At weaning, or at termination of the stocker phase, cattle were transported to TAES-Amarillo for feedlot and slaughter. Fallborn calves from low stocking rates weaned heaviest (305 kg), and winter-born calves grazed at high stocking rates weaned lightest (216 kg) (P<.05). Respective differences in weaning weight between steers and heifers were greater (P<.05) for fall-bom calves (291 vs 278 kg) than for winter-born calves (251 vs 244 kg). Cattle grazed preweaning at high stocking rates exhibited compensatory gains during the stocker phase (P<. 0 1). Compensatory gains of winter-bom cattle were dependent upon the availability of supplemental energy (P<.05). Winter-bom cattle were heavier (424 vs 334 kg) and older (12 vs 16 mo) than fall-born cattle at the termination of the stocker phase (P<.Ol). Feedlot ADG, feed to gain ratio, average daily intake, and final weight of fall-or winter-born cattle were not affected by preweaning stocking rate. Feedlot ADG for yearlings was 1. 25 kg/d, 1. 15 kg/d for calves, and 1. 21 kg/d for long-yearlings. Differences in feedlot ADG and feed to gain ratio due to sex were sioficant (P<.05) when heifers entered the feedlot at an older age and heavier weight. Since cattle were finished to a relatively uniform backfat, no major differences in carcass traits were observed due to pre-or postwearing management. Of the cattle born from 1984 to 1988, 65 % graded USDA Select, when finished to a visual appraisal of > .76 and < 1. 27 cm of backfat. Average USDA yield grade was, 1.9. This breeding combination provided highly cutable and lean carcasses when slaughtered at the targeted backfat thickness regardless of postwearing management.
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Includes bibliographical references: p. 152-158.
Issued also on microfiche from Lange Micrographics.
Garcia Estefan, Antonio (1996). Birth to slaughter growth and carcass composition of Simmental-sired calves as influenced by birth season, pre-weaning stock rate, and sex. Master's thesis, Texas A&M University. Available electronically from
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