Genetic parameters and correlations for lactation milk yields according to lactation numbers in Jersey cows [Jersey i·neklerde laktasyon si{dotless}ralari{dotless}na göre laktasyon süt verimleri i·çin genetik parametreler ve korelasyonlar]

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dc.contributor.authorÜnalan A.
dc.contributor.authorÇankaya S.
dc.date.accessioned2019-08-01T13:38:39Z
dc.date.available2019-08-01T13:38:39Z
dc.date.issued2010
dc.departmentNiğde ÖHÜ
dc.description.abstractIn this study, heritabilities, genetic and phenotypic correlations for lactation milk yields were estimated using 3630 305-day lactation milk yield records obtained from cows calved from 1984 to 2007 years in Jersey cattle herd of Karaköy Agricultural State Farm in Samsun. Calving year, calving month and lactation number were assumed as fixed effect factors in statistical analysis of data. Heritabilities, genetic and phenotypic correlations were estimated by derivative-free REML with the animal model. Analysis showed that the overall means of 305-day milk yield, lactation length, dry off period and calving interval were 3467 kg, 297 days, 70 days and 367 days, respectively. Variance analysis results showed that all of the fixed effect factors were statistically significant on lactation milk yields (P<0.001). REML estimates of heritability were 0.289, 0.319, 0.324, 0.331, 0.339, 0.357 and 0.379 for lactation milk yields (from the first to seventh lactation numbers, respectively). Genetic correlations among the first and sub-sequent lactation milk yields were 0.687, 0.676, 0.631, 0.601, 0.590 and 0.551, respectively. All genetic correlations were high and statistically significant (P<0.01). High genetic correlations among lactation numbers reflected that the first lactation milk yield of cows would be useful indicator for the sub-sequent lactations and selection of breeding stock.
dc.identifier.endpage1000
dc.identifier.issn1300-6045
dc.identifier.issue6
dc.identifier.startpage995
dc.identifier.urihttps://hdl.handle.net/11480/1014
dc.identifier.volume16
dc.institutionauthor[0-Belirlenecek]
dc.language.isotr
dc.relation.ispartofKafkas Universitesi Veteriner Fakultesi Dergisi
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectCorrelation
dc.subjectHeritability
dc.subjectJersey
dc.subjectMilk yield
dc.subjectParity
dc.subjectREML
dc.titleGenetic parameters and correlations for lactation milk yields according to lactation numbers in Jersey cows [Jersey i·neklerde laktasyon si{dotless}ralari{dotless}na göre laktasyon süt verimleri i·çin genetik parametreler ve korelasyonlar]
dc.typeArticle

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