Uneven milking intervals are adequate to achieve the benefits of increased milking frequency in early lactation

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dc.contributor.authorHanling, H. H.en
dc.contributor.authorMcGilliard, M. L.en
dc.contributor.authorCorl, Benjamin A.en
dc.contributor.departmentDairy Scienceen
dc.date.accessioned2021-07-29T17:51:04Zen
dc.date.available2021-07-29T17:51:04Zen
dc.date.issued2021-08-01en
dc.date.updated2021-07-29T17:51:02Zen
dc.description.abstractIncreasing milking frequency (MF) increases milk yield (MY) and farm profit, and optimal milking intervals (MI) prevent milk production decline. The objective of this experiment was to compare the MY effect of even and uneven 4 times daily (4×) MI in early lactation under increased MF. Fourteen multiparous and 6 primiparous cows were milked using unilateral frequent milking, with right udder halves milked 4× and left udder halves milked 2 times daily (2×) for 20 d in early lactation starting on d 5 postpartum. Ten (7 multiparous and 3 primiparous) cows were allocated evenly based on parity and assigned to either the even or the uneven MI groups distinguished by intervals of 9:3:9:3 h or 6:6:6:6 h. The left and right udder halves were milked at 0100 and 1300 h. The right udder glands were additionally milked at 0400 and 1600 h for the uneven MI group and at 0700 and 1900 h for the even MI group. Milk from each udder half was weighed and sampled for components on the final day of treatment and at 60, 120, 180, 240, and 300 d in milk. The overall effect of 4× milking on the right udder halves was a 5.96 ± 0.70 kg/d increase in MY on d 21 of unilateral frequent milking compared with the 2× udder halves. This elevated MY continued through 300 d in milk and averaged 1.56 ± 0.70 kg/d. Increased MF in early lactation increased the udder half difference in total yield throughout a 300-d lactation by 508 kg for milk, 25 kg for milk fat, and 15 kg for milk protein. Increased MF in early lactation increased milk component yields, but there were no differences between MI groups. The lack of treatment difference may be beneficial to farmers. The ability to achieve the same increased MY effect with uneven MI may optimize labor efficiency because early-lactation cows could be milked at the beginning and end of milking sessions. Farmers would not have to add additional milking sessions to achieve the enhanced MY response regardless of normal milking session length.en
dc.description.versionAccepted versionen
dc.format.extentPages 9355-9361en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.3168/jds.2020-20100en
dc.identifier.eissn1525-3198en
dc.identifier.issn0022-0302en
dc.identifier.issue8en
dc.identifier.orcidCorl, Benjamin [0000-0002-6495-3279]en
dc.identifier.otherS0022-0302(21)00572-5 (PII)en
dc.identifier.pmid33934868 (pubmed)en
dc.identifier.urihttp://hdl.handle.net/10919/104441en
dc.identifier.volume104en
dc.language.isoenen
dc.publisherAmerican Dairy Science Associationen
dc.relation.urihttps://www.ncbi.nlm.nih.gov/pubmed/33934868en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectincreased milking frequencyen
dc.subjectmilking intervalen
dc.subjectunilateral frequent milkingen
dc.subjectAgriculture Profitability and Sustainabilityen
dc.subjectDairy & Animal Scienceen
dc.subject0702 Animal Productionen
dc.subject0908 Food Sciencesen
dc.subject.meshMammary Glands, Animalen
dc.subject.meshMilken
dc.subject.meshAnimalsen
dc.subject.meshCattleen
dc.subject.meshLactationen
dc.subject.meshPregnancyen
dc.subject.meshTime Factorsen
dc.subject.meshDairyingen
dc.subject.meshFemaleen
dc.titleUneven milking intervals are adequate to achieve the benefits of increased milking frequency in early lactationen
dc.title.serialJournal of Dairy Scienceen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.otherJournal Articleen
dcterms.dateAccepted2021-03-28en
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/Agriculture & Life Sciencesen
pubs.organisational-group/Virginia Tech/Agriculture & Life Sciences/Dairy Scienceen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Agriculture & Life Sciences/CALS T&R Facultyen

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