Influence of male-to-female ratio and climatic conditions on the reproductive performance of Anglo Nubian goats

Autores

  • Carlos Geraldo Tenório Alves Instituto Federal de Educação, Ciência e Tecnologia de Pernambuco, Belo Jardim, PE
  • José Monteiro Almeida-Irmão Instituto Federal de Educação, Ciência e Tecnologia de Pernambuco, Barreiros, PE
  • Marcelo Tigre Moura Universidade Federal Rural de Pernambuco, Departamento de Medicina Veterinária, Recife, PE
  • José Carlos Ferreira da Silva Instituto Federal de Educação, Ciência e Tecnologia de Pernambuco, Barreiros, Pe
  • Pamela Ramos de Deus Universidade Federal Rural de Pernambuco, Departamento de Medicina Veterinária, Recife, PE
  • Jairo Pereira Neves Universidade de Brasília, Faculdade de Agronomia e Medicina Veterinária, Brasília, DF
  • Claudio Coutinho Bartolomeu Universidade Federal Rural de Pernambuco, Departamento de Medicina Veterinária, Recife, PE
  • Paulo Fernandes de Lima Universidade Federal Rural de Pernambuco, Departamento de Medicina Veterinária, Recife, PE
  • Marcos Antonio Lemos de Oliveira Universidade Federal Rural de Pernambuco, Departamento de Medicina Veterinária, Recife, PE

DOI:

https://doi.org/10.17523/bia.v71n3p284

Palavras-chave:

biostimulation, goats, male effect

Resumo

The objective of this study was to test the €œmale effect€ on the reproductive performance of Anglo Nubian does (n = 180), aged between 24 and 60 months, under different male-to-female ratios (1:20 €“ T20, 1:30 €“ T30, and 1:40 €“ T40) and climatic conditions (dry season €“ DS, and rainy season €“ RS). Does were randomly distributed into three groups (T20, T30, and T40) and were isolated from bucks at a distance of 300 m for 60 days before the start of the experiments. The first manifestation of estrous during the DS occurred 6.83 ± 4.54 (T20), 6.72 ± 4.56 (T30) and 7.05 ± 5.23 (T40) days following the onset of the breeding season (P>0.05). In the RS, onset of estrous was observed 6.60 ± 4.74 (T20), 6.70 ± 4.43 (T30) and 7.46 ± 4.54 (T40) days after the beginning of the breeding season (P>0.05). Estrous induction in females during the DS occurred in 95% (T20), 80% (T30), and 75.5% (T40) of all females. During the RS, estrous detection reached 100% (T20), 100% (T30), and 97.5% (T40) of all females, with no difference between all RS and DS groups. Estrous synchronization during the DS occurred in 35.00% (T20), 36.66% (T30), and 32.50% (T40) of all females, for an average occurrence of 34.72%. During the RS, synchronization occurred in 65% (T20), 70% (T30) and 62.25% (T40) of all females, for an average occurrence of 65.75%; no difference was detected between the RS and the DS. Pregnancy rates in the DS groups were 65.0% (T20), 70.0% (T30), and 62.5% (T40), while pregnancy rates in the RS were 90.0% (T20), 86.6% (T30), and 95.0% (T40). No difference was observed for conception rates between any of the RS and DS groups. Prolificacy during the DS was 1.30 (T20), 1.30 (T30) and 1.35 (T40), while in the RS prolificacy was 1.29 (T20), 1.25 (T30) and 1.30 (T40). Thus, the male effect can be used effectively for goats under 1:20€“1:40 male-to-female ratios in a 45-day mating season under varying climatic conditions.

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Publicado

01-03-2014

Edição

Seção

REPRODUÇÃO ANIMAL

Como Citar

Influence of male-to-female ratio and climatic conditions on the reproductive performance of Anglo Nubian goats. (2014). Boletim De Indústria Animal, 71(3), 284-290. https://doi.org/10.17523/bia.v71n3p284

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