Hormones, Metabolites, and Reproduction in Holsteins, Jerseys, and their crosses

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dc.contributor.authorBrown, Karen Leighen
dc.contributor.committeecochairCassell, Bennet G.en
dc.contributor.committeecochairGwazdauskas, Francis C.en
dc.contributor.committeememberHanigan, Mark D.en
dc.contributor.departmentDairy Scienceen
dc.date.accessioned2014-03-14T20:44:08Zen
dc.date.adate2010-09-06en
dc.date.available2014-03-14T20:44:08Zen
dc.date.issued2010-08-04en
dc.date.rdate2012-05-08en
dc.date.sdate2010-08-24en
dc.description.abstractCows in first (n = 163) and second (n = 101) lactation were studied to determine if reproduction, progesterone (P4), IGF-I, insulin, NEFA, and milk production differed between genetic groups. Thirty-five cows were Holstein-Jersey (HJ) crosses, 48 were Jersey-Holstein (JH) crosses, 51 were Holsteins (HH), and 29 were Jerseys (JJ). Days open (DO) was affected by genetic group. HH had 168.6 ± 9.6 DO which was different from HJ (142.9 ± 11.3 d), JJ (132.1 ± 12.1 d), and JH (127.2 ± 9.3 d). HH had 2.4 ± 0.1 services per conception which was different from JH (1.9 ± 0.1), but not different from HJ (2.1 ± 0.2) or JJ (2.1 ± 0.2). In HH P4 concentrations (1.6 ± 0.11 ng/mL) were not different from HJ (1.5 ± 0.12 ng/mL), but lower than JH (1.8 ± 0.10 ng/mL) and JJ (1.8 ± 0.13 ng/mL). NEFA concentrations were greater in lactation 2 (0.52 ± 0.02 mEq/L) than in lactation 1 (0.45 ± 0.02 mEq/L). Insulin in HH (0.83 ± 0.03 ng/mL) was not different from HJ (0.87 ± 0.04 ng/mL) or JH (0.76 ± 0.03 ng/mL), but was greater than JJ (0.66 ± 0.04 ng/mL). IGF-I gradually increased over the 10 wk period. The HH produced 10,348 ± 208 kg of milk, which was greater than the HJ (9,129 ± 230 kg), the JH (9,384 ± 192 kg), and the JJ (7,080.9 ± 261 kg). Reproductive measures, milk yield, hormones and metabolites were affected by genetic groups.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-08242010-161432en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-08242010-161432/en
dc.identifier.urihttp://hdl.handle.net/10919/34746en
dc.publisherVirginia Techen
dc.relation.haspartBrown_KL_T_2010.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectInsulinen
dc.subjectNEFAen
dc.subjectProgesteroneen
dc.subjectIGF-Ien
dc.titleHormones, Metabolites, and Reproduction in Holsteins, Jerseys, and their crossesen
dc.typeThesisen
thesis.degree.disciplineDairy Scienceen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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