Artificial Induction of Lactation in Nonbreeder Dairy Cows

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dc.contributor.authorJewell, Tracy Michelleen
dc.contributor.committeechairBarnes, Michael A.en
dc.contributor.committeememberAkers, Robert Michaelen
dc.contributor.committeememberPearson, Ronald E.en
dc.contributor.committeememberNickerson, Stephen C.en
dc.contributor.committeememberNebel, Raymond L.en
dc.contributor.departmentDairy Scienceen
dc.date.accessioned2014-03-14T20:40:28Zen
dc.date.adate2003-07-31en
dc.date.available2014-03-14T20:40:28Zen
dc.date.issued2002-08-09en
dc.date.rdate2004-07-31en
dc.date.sdate2003-06-24en
dc.description.abstractThirty-four cows (26 Holsteins and 8 Jerseys) were subjected to an estrous synchronization protocol administering 2 PGF2Æ Ã injections 11 d apart prior to beginning the lactation-induction protocol. Artificial induction of lactation yielded a 92% success rate for Holstein cows with success defined as achieving >9 kg milk/d, and a 88% success rate for Jersey cows with success defined as achieving > 5 kg milk/d. Mean accumulated milk yield for induced cows at 150 DIM was 65% of mean yield for nontreated cows. Mean peak milk yield for lactation- induced Holsteins and Jerseys was 32 kg/d and 20 kg/d, respectively. Mean serum and milk progesterone concentrations for samples collected during the first 6 d of lactation were not different between lactation-induced and nontreated cows. However, mean serum estradiol concentrations for induced cows were higher (P <0.05) in samples collected 3 and 5 DIM. Lactation-induced cows exhibited an increase in serum alpha-lactalbumin concentrations 2 d prior to initiation of milking, reaching values of ~260 ng/ml. Mean days-to-first service was greatly reduced in cows induced into lactation compared to nontreated cows, while mean services per conception was similar between induced and nontreated cows. Mean days to conception was lower for induced cows than for nontreated cows. By 150 DIM, pregnancy rate of induced cows was 70%, whereas nontreated cows averaged 56% pregnancy rate.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-06242003-071849en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06242003-071849/en
dc.identifier.urihttp://hdl.handle.net/10919/33721en
dc.publisherVirginia Techen
dc.relation.haspartfinal1.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectestrous cycleen
dc.subjectdairy cattleen
dc.subjectinduction of lactationen
dc.titleArtificial Induction of Lactation in Nonbreeder Dairy Cowsen
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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