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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
dc.creator | Garcia Estefan, Antonio | |
dc.date.accessioned | 2012-06-07T22:44:36Z | |
dc.date.available | 2012-06-07T22:44:36Z | |
dc.date.created | 1996 | |
dc.date.issued | 1996 | |
dc.identifier.uri | https://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-G374 | |
dc.description | Due to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to digital@library.tamu.edu, referencing the URI of the item. | en |
dc.description | Includes bibliographical references: p. 152-158. | en |
dc.description | Issued also on microfiche from Lange Micrographics. | en |
dc.description.abstract | 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. | en |
dc.format.medium | electronic | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | en_US | |
dc.publisher | Texas A&M University | |
dc.rights | This thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries in 2008. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use. | en |
dc.subject | animal science. | en |
dc.subject | Major animal science. | en |
dc.title | Birth to slaughter growth and carcass composition of Simmental-sired calves as influenced by birth season, pre-weaning stock rate, and sex | en |
dc.type | Thesis | en |
thesis.degree.discipline | animal science | en |
thesis.degree.name | M.S. | en |
thesis.degree.level | Masters | en |
dc.type.genre | thesis | en |
dc.type.material | text | en |
dc.format.digitalOrigin | reformatted digital | en |
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