Estimation of sustained peak yield interval of dairy cattle lactation curves using a broken-line regression approach

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dc.contributor.authorSahinler, S.
dc.date.accessioned2024-09-18T20:59:12Z
dc.date.available2024-09-18T20:59:12Z
dc.date.issued2009
dc.departmentHatay Mustafa Kemal Üniversitesien_US
dc.description.abstractA broken-line regression model with three straight lines and two breakpoints was used to estimate the sustained peak yield of the lactation curve. A sample of 1548 lactation records of 425 Holstein-Friesian cows was provided by the Research and Application Farm of the Agriculture Faculty of Cukurova University in Adana, Turkey. A total of 13463 test-day milk yields (kg/day), recorded once a month with electronic identification and automatic milking recording systems, between November 1994 and January 2006, were used. The data was classified as first, second, third, fourth, fifth, sixth and seventh parity, and included 4105, 3238, 2495, 1800, 1113, 641 and 71 test-day records, respectively. Times (days) at the beginning and end of sustained peak yield per parity were 73.9 - 160.2, 70.6 - 131.9, 70.8 - 130.7, 71.0 - 130.3, 71.3 - 130.4, 71.2 - 128.2 and 71.1 - 129.8, respectively. The peak yields of lactation curves were 19.1 kg/d, 21.8 kg/d, 23.8 kg/d, 24.2 kg/d, 24.2 kg/d 24.4 kg/d and 21.3 kg/d, and days in milk (DIM) at peak yields of lactation curves per parity were 126, 103, 102, 104, 106, 103 and 104, respectively. Persistency values (days) and total lactation milk yields (kg/lactation) per parity were 86.4, 61.3, 59.9, 59.3, 59.1, 57.0, 58.7 and 4852.2, 5105.7, 5503.5, 5503.7, 5449.3, 5416.3, 4802.4, respectively. Results showed that the first parity had a lactation curve with the lowest milk yield at peak that reached the peak point at the latest time (DIM) after parturition, but the largest interval between the beginning and end of the sustained peak yield among all parities. This means that the cows in the first lactation were more persistent than those in the later lactations.en_US
dc.identifier.endpage29en_US
dc.identifier.issn0375-1589
dc.identifier.issue1en_US
dc.identifier.scopus2-s2.0-68949136887en_US
dc.identifier.scopusqualityQ3en_US
dc.identifier.startpage22en_US
dc.identifier.urihttps://hdl.handle.net/20.500.12483/12453
dc.identifier.volume39en_US
dc.identifier.wosWOS:000266889700004en_US
dc.identifier.wosqualityQ3en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherSouth African Journal Of Animal Sciencesen_US
dc.relation.ispartofSouth African Journal of Animal Scienceen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectSustained peak yield intervalen_US
dc.subjectbreakpoint estimationen_US
dc.subjectlactation curveen_US
dc.subjectpersistencyen_US
dc.titleEstimation of sustained peak yield interval of dairy cattle lactation curves using a broken-line regression approachen_US
dc.typeArticleen_US

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