Lactation Curve Traits of Holstein Cows Raised at Polatli State Farm

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dc.contributor.authorKeskin, İsmail
dc.contributor.authorÇilek, Süleyman
dc.contributor.authorİlhan, Fatma
dc.date.accessioned2020-06-25T17:48:56Z
dc.date.available2020-06-25T17:48:56Z
dc.date.issued2009
dc.departmentKırıkkale Üniversitesi
dc.description.abstractThis study was done to determine lactation curves traits of Holstein cows raised at Polatli State Farm. Gamma curve parameters (Yt = at(b)e(-ct)) of Wood were used in determination of the types of lactation curve. In this study, values of parameters a, b, c were used in determination of the shape and type of lactation curve. All parameters in typical lactation curves are positive. As one of these parameters is negative, curve is atypical lactation curve. If both b and c parameter are negative, lactation curves are concave. If b parameter is negative and c parameter is positive, lactation curve have negative slope (decreasing type). In total 2581 lactation curves were investigated in this study, 2049 lactation curves were determined as typical (79.39%), 253 lactation curves were determined as concave (9.80%). 279 lactation curves were determined as decreasing type (10.81%). For typical lactation curves, a (beginning yield), b (coefficient of rising), c (coefficient of decreasing), persistency (S), the time after parturition when the peak yield occurs (T-max), maximum daily peak yield (Y-max) and coefficient of determination of variation (R-2) were 27.5 +/- 0.18, 0.47 +/- 0.008, 0.178 +/- 0.0023, 2.7 +/- 0.001, 81 +/- 2.1, 26.7 +/- 0.15, 68.0 +/- 0.50, respectively. For concave lactation curves, values of a, b, c, Tmax, Ymax and R-2 were found as 23.5 +/- 0.42, -0.37 +/- 0.016, -0.062 +/- 0.0038, 744 +/- 159, 16.5 +/- 0.42 and 47.8 +/- 1.68, respectively. For decreasing typical lactation curves, values of a, b, c, Tmax, S and R-2 were found as 27.6 +/- 0.41, -0.13 +/- 0.007, 0.051 +/- 0.0023, -567 +/- 327, 2.9 +/- 0.05 and 65.8 +/- 1.33, respectively.en_US
dc.identifier.citationKeskin, İ.& Çilek, S. & İlhan, F. (2009). Lactation Curve Traits of Holstein Cows Raised at Polatlı State Farm. Kafkas Universitesi Veteriner Fakultesi Dergisi. 15(39), 437-442. 10.9775/kvfd.2009.034-Aen_US
dc.identifier.endpage442en_US
dc.identifier.issn1300-6045
dc.identifier.issue3en_US
dc.identifier.scopus2-s2.0-70349242384
dc.identifier.scopusqualityQ3
dc.identifier.startpage437en_US
dc.identifier.urihttps://hdl.handle.net/20.500.12587/4594
dc.identifier.volume15en_US
dc.identifier.wosWOS:000268521900020
dc.identifier.wosqualityQ4
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isotr
dc.publisherKafkas Univ, Veteriner Fakultesi Dergisien_US
dc.relation.ispartofKafkas Universitesi Veteriner Fakultesi Dergisi
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectHolsteinen_US
dc.subjectLactation curveen_US
dc.subjectPersistencyen_US
dc.subjectMathematical modelen_US
dc.titleLactation Curve Traits of Holstein Cows Raised at Polatli State Farmen_US
dc.typeArticle

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