Estimação de tendência genética para produção de leite na raça Holandesa no estado de Minas Gerais

A total of 32,817 test-day milk yield (TDMY) records of the first lactation of 4,056 Girolando cows daughters of 276 sires, collected from 118 herds between 2000 and 2011 were utilized to estimate the genetic parameters for TDMY via random regression models (RRM) using Legendre’s polynomial functions whose orders varied from 3 to 5. In addition, nine measures of persistency in milk yield (PSi) and the genetic trend of 305-day milk yield (305MY) were evaluated. The fit quality criteria used indicated RRM employing the Legendre’s polynomial of orders 3 and 5 for fitting the genetic additive and permanent environment effects, respectively, as the best model. The heritability and genetic correlation for TDMY throughout the lactation, obtained with the best model, varied from 0.18 to 0.23 and from −0.03 to 1.00, respectively. The heritability and genetic correlation for persistency and 305MY varied from 0.10 to 0.33 and from −0.98 to 1.00, respectively. The use of PS7 would be the most suitable option for the evaluation of Girolando cattle. The estimated breeding values for 305MY of sires and cows showed significant and positive genetic trends. Thus, the use of selection indices would be indicated in the genetic evaluation of Girolando cattle for both traits.

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Estimation of Genetic and Phenotypic Trends, Heritability and Repeatability for Some Milk Production Traits of Holsteins

Bakir¹,

Kaygisiz²

2009

Kafkas Univ Vet Fak Derg

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Bu çalışmada, Siyah Alaca sığırlarda 305 günlük süt verimi ve laktasyon süresine ilişkin yönelim unsurları ve genetik parametreler tahmin edilmiştir. 305 günlük süt verimi ve laktasyon süresi için fenotipik, genetik ve çevresel yönelimler sırasıyla, 23.59 kg/yıl ve -0.486 gün/yıl, 7.99 kg/yıl ve -0.49 gün/yıl ve -31.58 kg/yıl ve -0.976 gün/yıl olarak tespit edilmiştir. 305 günlük süt verimi ve laktasyon süresine ait kalıtım dereceleri 0.10 ve 0.11, tekrarlanma dereceleri ise 0.27 ve 0.17 olarak hesaplanmıştır.Anahtar sözcükler: Siyah Alaca, Süt verimi, Genetik yönelim, Genetik parametre Estimation of Genetic and Phenotypic Trends, Heritability and Repeatability for Some Milk Production Traits of Holsteins SummaryThe purpose of this study is to estimate the trend components and genetic parameters of 305-day milk yield and lactation length in Holstein Friesian Cattle. The phenotypic, genetic and environmental trends for 305 days milk yield and lactation length were found to be -23.59 kg/year and -0.486 days/year, 7.99 kg/year and -0.49 days/year, -31.58 kg/year and -0.976 day/year, respectively. The heritability and repeatability for 305 days milk yield and lactation length were 0.10, 0.11 and 0.27, 0.17, respectively.

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Estimação de tendência genética para produção de leite na raça Holandesa no estado de Minas Gerais

Abstract: RESUMO

Cited by 3 publications

References 10 publications

Genetic trend estimates for milk yield production and fertility traits of the Girolando cattle in Brazil

Genetic trend estimates for milk yield production and fertility traits of the Girolando cattle in Brazil

Genetic Parameters for Milk Yield and Lactation Persistency Using Random Regression Models in Girolando Cattle

Estimation of Genetic and Phenotypic Trends, Heritability and Repeatability for Some Milk Production Traits of Holsteins

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