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A new way to measure milk yield persistency: a genetic point of view with application to Gyr (Bos indicus) cattle

Published online by Cambridge University Press:  05 August 2015

Rodrigo Junqueira Pereira ,
Denise Rocha Ayres ,
Lenira El Faro ,
Aníbal Eugênio Vercesi Filho ,
Rui da Silva Verneque  and
Lucia Galvão de Albuquerque
Rodrigo Junqueira Pereira*
Affiliation:
Departamento de Zootecnia, Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista, Rodovia Carlos Tonnani, Km 5, CEP 14870 -000 Jaboticabal, SP, Brazil Grupo de Melhoramento Animal de Mato Grosso (GMAT), Instituto de Ciências Agrárias e Tecnológicas, Universidade Federal de Mato Grosso, MT-270, Km 06, CEP 78735-001, Campus Rondonópolis, MT, Brazil
Denise Rocha Ayres
Affiliation:
Departamento de Zootecnia, Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista, Rodovia Carlos Tonnani, Km 5, CEP 14870 -000 Jaboticabal, SP, Brazil Grupo de Melhoramento Animal de Mato Grosso (GMAT), Instituto de Ciências Agrárias e Tecnológicas, Universidade Federal de Mato Grosso, MT-270, Km 06, CEP 78735-001, Campus Rondonópolis, MT, Brazil
Lenira El Faro
Affiliation:
Instituto de Zootecnia, Rodovia Carlos Tonanni, Km 94, CEP 14160-900, Sertãozinho, SP, Brazil
Aníbal Eugênio Vercesi Filho
Affiliation:
Instituto de Zootecnia, Rodovia Carlos Tonanni, Km 94, CEP 14160-900, Sertãozinho, SP, Brazil
Rui da Silva Verneque
Affiliation:
Embrapa Gado de Leite, Rua Eugênio do Nascimento, 610, Bairro Dom Bosco, CEP 36038-330, Juiz de Fora, MG, Brazil
Lucia Galvão de Albuquerque
Affiliation:
Departamento de Zootecnia, Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista, Rodovia Carlos Tonnani, Km 5, CEP 14870 -000 Jaboticabal, SP, Brazil
*
*For correspondence; e-mail: [email protected]
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Abstract

The objective of this work was to estimate genetic parameters for a measure of persistency of milk yield and to evaluate its association with 305-d cumulative milk yield and lactation length. 12 346 records from 8202 dairy Gyr cows including lactations up to fifth calving were used. The measure of persistency was obtained from one of the parameters of a quadratic model that describes the cumulative yield across lactation as a function of days in milk. A three-trait multivariate analysis was done. Heritability and repeatability for persistency were 0·08 and 0·21, respectively. Deviance Information Criterion provided evidence that the additive genetic covariance between the measure of persistency studied and 305-d cumulative yield is zero. Genetic correlations between persistency and lactation length were 0·50 and 0·27 for first or all lactations, respectively. Milk yield persistency as measured in this study has low heritability. Selection for persistency can increase lactation length. The measure of milk yield persistency studied here is genetically independent of total milk yield and can be included in routine genetic evaluations of dairy cattle.

Keywords

Bayesian inferencedairy cattlegenetic parameterspersistency
Type
Research Article
Information
Journal of Dairy Research , Volume 82 , Issue 4 , November 2015 , pp. 385 - 390
Copyright
Copyright © Proprietors of Journal of Dairy Research 2015 

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