Estimativas de parâmetros genéticos e de ambiente para medidas repetidas de produção leiteira em caprinos

George Rodrigo Beltrão da Cruz; Daiane Gonçalves dos Santos; Edvaldo Mesquita Beltrão Filho; Evandra da Silva Justino; Aécio Melo de Lima; Paulo Rodrigues Dantas Júnior

doi:10.1590/1089-6891v20e-47704

ESTIMATES OF GENETIC AND ENVIRONMENTAL PARAMETERS FOR REPEATED MEASURES OF MILK PRODUCTION IN GOATS

Authors

George Rodrigo Beltrão da Cruz Universidade Federal da Paraíba (UFPB), João Pessoa, Paraíba, Brasil https://orcid.org/0000-0002-8480-4625
Daiane Gonçalves dos Santos Universidade Federal da Paraíba (UFPB), João Pessoa, Paraíba, Brasil https://orcid.org/0000-0001-9629-0441
Edvaldo Mesquita Beltrão Filho Universidade Federal da Paraíba (UFPB), João Pessoa, Paraíba, Brasil https://orcid.org/0000-0002-1940-6356
Evandra da Silva Justino Universidade Federal da Paraíba (UFPB), João Pessoa, Paraíba, Brasil https://orcid.org/0000-0001-6888-9334
Aécio Melo de Lima Universidade Federal da Paraíba (UFPB), João Pessoa, Paraíba, Brasil https://orcid.org/0000-0002-2874-3047
Paulo Rodrigues Dantas Júnior Universidade Federal da Paraíba (UFPB), João Pessoa, Paraíba, Brasil https://orcid.org/0000-0002-2041-4441

DOI:

https://doi.org/10.1590/1089-6891v20e-47704

Abstract

Abstract
The objective of this study was to compare mathematical functions in adjusting the mean and individual lactation curve of goats and to estimate genetic and environmental parameters for repeated measures of milk production. 183 lactations were used, 121 of Saanen goats and 62 of Alpine goats, of animals belonging to the Laboratory of goat and Sheep of UFPB/CCHSA. The milk control was performed at intervals of seven days. The adjustment was made to the mean curve using six mathematical functions: inverse polynomial, linear hyperbolic, incomplete gamma, quadratic logarithmic, linear and quadratic, and adjusted by interactive processes through non-linear regression. The criteria used to verify the fit quality for each function were adjusted coefficient of determination (R2a), percentages of deviation between observed and estimated total yields, percentages of typical curves, mean absolute deviation and mean square of residues. It was verified that any of the models tested can be used for mean curve estimates, but for the study of the individual curves, the incomplete gamma model should be preferred because it presents better estimates of the components of the lactation curve.
Keywords: dairy goats; lactation curve; mathematical models

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Published

2019-05-24

How to Cite

CRUZ, G. R. B. da; SANTOS, D. G. dos; FILHO, E. M. B.; JUSTINO, E. da S.; LIMA, A. M. de; JÚNIOR, P. R. D. ESTIMATES OF GENETIC AND ENVIRONMENTAL PARAMETERS FOR REPEATED MEASURES OF MILK PRODUCTION IN GOATS. Brazilian Animal Science/ Ciência Animal Brasileira, Goiânia, v. 20, p. 1–13, 2019. DOI: 10.1590/1089-6891v20e-47704. Disponível em: https://revistas.ufg.br/vet/article/view/47704. Acesso em: 22 dec. 2024.

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Issue

Vol. 20 (2019): Continuous publication

Section

ZOOTECNIA

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