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Persistency of lactation using random regression models and different fixed regression modeling approaches

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Persistency of lactation using random regression models and different fixed regression modeling approaches

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Título Persistency of lactation using random regression models and different fixed regression modeling approaches
Autor Cobuci, Jaime Araújo
Costa, Claudio Napolis
Abstract Milk yield test-day records on the first three lactations of 25,500 Holstein cows were used to estimate genetic parameters and predict breeding values for nine measures of persistency and 305-d milk yield in a random regression animal model using two criteria to define the fixed regression. Legendre polynomials of fourth and fifth orders were used to model the fixed and random regressions of lactation curves. The fixed regressions were adjusted for average milk yield on populations (single) or subpopulations (multiple) formed by cows that calved at the same age and in the same season. Akaike Information (AIC) and Bayesian Information (BIC) criteria indicated that models with multiple regression lactation curves had the best fit to test-day milk records of first lactations, while models with a single regression curve had the best fit for the second and third lactations. Heritability and genetic correlation estimates between persistency and milk yield differed significantly depending on the lactation order and the measures of persistency used. These parameters did not differ significantly depending on the criteria used for defining the fixed regressions for lactation curves. In general, the heritability estimates were higher for first (0.07 to 0.43), followed by the second (0.08 to 0.21) and third (0.04 to 0.10) lactation. The rank of sires resulting from the processes of genetic evaluation for milk yield or persistency using random regression models differed according to the criteria used for determining the fixed regression of lactation curve.
Contido em Revista brasileira de zootecnia= Brazilian journal of animal science [recurso eletrônico]. Viçosa, MG. Vol. 41, n. 9 (set. 2012), p. 1996-2004
Assunto Gado leiteiro
Genetica animal
Melhoramento genetico animal
[en] Breeding value
[en] Legendre polynomial
[en] Selection
[en] Test-day milk yield
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/98474
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