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dc.contributor.advisorSanders, James O.en_US
dc.creatorWright, Bradley Allenen_US
dc.date.accessioned2007-04-25T20:14:54Z
dc.date.available2007-04-25T20:14:54Z
dc.date.created2006-12en_US
dc.date.issued2007-04-25
dc.identifier.urihttp://hdl.handle.net/1969.1/4978
dc.description.abstractData from 75 F2 Brahman-Hereford cows of four specific breed combinations, F2 HB (produced by F1 HB sires x F1 HB dams, where “HB” refers to cattle sired by Hereford bulls and out of Brahman cows), F2 BH (produced by F1 BH sires x F1 BH dams), HB x BH and BH x HB, were evaluated for maternal performance at the Texas A&M Research Center near McGregor. Differences between breed combinations were analyzed for calf crop born (CCB), calf crop weaned (CCW), calf survival (CS), birth weight (BW), weaning weight (WW), and cow weight at palpation (PW). The adjusted means for F2 HB, F2 BH, HB x BH, and BH x HB were 0.84 ± 0.06, 0.57 ± 0.07, 0.82 ± 0.06, and 0.62 ± 0.08, respectively, for CCW. F2 HB cows had a 0.27 ± 0.09 higher percent calf crop weaned than F2 BH cows (P < 0.01) and a 0.22 ± 0.11 higher percent calf crop weaned than BH x HB cows (P < 0.05). HB x BH cows had a 0.25 ± 0.08 higher percent calf crop weaned than F2 BH (P < 0.01) and a 0.20 ± 0.10 higher percent calf crop weaned than BH x HB cows (P < 0.05). As 6-year-olds, the adjusted means for cow weight at palpation for F2 HB, F2 BH, HB x BH, and BH x HB cows were 523.65 ± 20.49 kg, 602.61 ± 23.63 kg, 492.84 ± 16.98 kg, and 515.93 ± 22.96 kg, respectively. Averaged across all ages, HB x BH cows weighed 56.59 ± 15.29 kg less than F2 BH cows (P < 0.001) and 41.11 ± 18.92 kg less than BH x HB cows (P < 0.05). Also, F2 HB cows weighed 40.45 ± 17.68 kg less than F2 BH cows (P < 0.05). In this herd, HB-sired cows had higher reproductive efficiency than BH-sired cows. Also, HB-sired cows tended to be lighter than BH-sired cows. Although these differences existed, exact causes could not be determined primarily due to confounding between the birth year of the cow and the sire breed of the cow.en_US
dc.format.extent426465 bytes
dc.format.mediumelectronicen_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherTexas A&M Universityen_US
dc.subjectReciprocal differencesen_US
dc.subjectF2 Brahman-Hereford cowsen_US
dc.subjectReproductive efficiencyen_US
dc.titleReciprocal cross differences in Brahman-Hereford F2 cows: reproductive and maternal traitsen_US
dc.typeBooken
dc.typeThesisen
thesis.degree.departmentAnimal Scienceen_US
thesis.degree.disciplineAnimal Breedingen_US
thesis.degree.grantorTexas A&M Universityen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelMastersen_US
dc.contributor.committeeMemberHerring, Andy D.en_US
dc.contributor.committeeMemberWomack, James E.en_US
dc.type.genreElectronic Thesisen_US
dc.type.materialtexten_US
dc.format.digitalOriginborn digitalen_US


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