Estimativa dos efeitos diretos, maternos e de heterose para permanência produtiva em dialelo com Holandês e Pardo Suíço em condições subtropicais

Autores

  • Anel Ledesma-Rodríguez
  • Vicente Eliezer Vega-Murillo
  • Ángel Ríos-Utrera
  • Guillermo Martínez-Velázquez
  • Moisés Montaño-Bermúdez
  • Argel Flores-Primo
  • Rodolfo Canseco-Sedano
  • Jorge Genaro Vicente-Martínez
  • René Carlos Calderón-Robles

DOI:

https://doi.org/10.34188/bjaerv7n2-105

Palavras-chave:

permanência produtiva, México, lactação, gado leiteiro

Resumo

O objetivo do estudo foi estimar os efeitos genéticos diretos, maternos e de heterose para características de longevidade em dialelo com Holandês e Pardo Suíço, sob condições subtropicais. Foram utilizadas informações produtivas e genealógicas de 171 vacas Holandesas, Pardas Suíças e seus cruzamentos F1 recíprocos; totalizando 568 lactações. As características de longevidade avaliadas foram: a probabilidade de as fêmeas terem uma, duas, três, quatro e cinco lactações dado que tiveram o primeiro parto. Devido à natureza dicotômica das variáveis ​​respostas, elas foram analisadas com um modelo linear generalizado, assumindo uma distribuição binomial com função de ligação probit. Cada modelo incluiu os efeitos fixos da raça do pai, raça da mãe, ano de nascimento, hora de nascimento e interação raça do pai por raça da mãe. A heterose individual para cruzamentos específicos, bem como os efeitos diretos e maternos, foram estimados segundo o modelo descrito por Dickerson (1973). Os efeitos diretos e maternos não foram significativos (p>0.05) para as características analisadas. A heterose foi significativa (p<0.05) para permanência produtiva da terceira à quinta lactação, com valores de 0.26 ± 0.10, 0.18 ± 0.07 e 0.19 ± 0.07 pontos percentuais, respectivamente. Os cruzamentos recíprocos tiveram maior probabilidade de sobreviver a lactações sucessivas do que os animais de raça pura, sugerindo que os agricultores podem usar um sistema de cruzamentos e os efeitos da heterose para maximizar a permanência das vacas no rebanho.

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Publicado

2024-06-23

Como Citar

Ledesma-Rodríguez, A., Vega-Murillo, V. E., Ríos-Utrera, Ángel, Martínez-Velázquez, G., Montaño-Bermúdez, M., Flores-Primo, A., Canseco-Sedano, R., Vicente-Martínez, J. G., & Calderón-Robles, R. C. (2024). Estimativa dos efeitos diretos, maternos e de heterose para permanência produtiva em dialelo com Holandês e Pardo Suíço em condições subtropicais. Brazilian Journal of Animal and Environmental Research, 7(2), e70708 . https://doi.org/10.34188/bjaerv7n2-105

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