Onset of reproductive activity of white and natural colored corriedale ewe lambs

  • Fernanda Dornelles Feijó Universidade Federal do Rio Grande do Sul
  • Gilson de Mendonça Universidade Federal de Pelotas
  • Pablo Tavares Costa Universidade Federal de Pelotas
  • Rômulo Tavares Costa Universidade Federal de Pelotas
  • Marina Benedetti Universidade Federal de Pelotas
  • Maurício Cardozo Machado Universidade Federal de Pelotas

Resumo

The objective of this study was to estimate differences in growth, plasma progesterone (P4) and age at puberty between white and natural colored Corriedale ewe lambs. Thirty ewe lambs with average age of 12 months were randomly allocated to genetic groups: white (WC, n = 15) and natural colored (NC, n = 15). Ewes were maintained under extensive grazing conditions on natural pasture, and herbage mass was estimated over a 28-day experimental period. Morphometric measurements (front and hind height, body length, thoracic perimeter, rump length and width, wool fiber length), body condition score (CC) and weight were taken at 28-day intervals. There was no effect of genetic group on body weight, average daily gain and morphometric measurements (P > 0.05). The WC ewe lambs had longer fiber length (P < 0.05). Plasma P4 was similar between genotypes (P > 0.05); however, it increased above 1ng ml-1 in NC from January onward and in WC from March onwards. Estrus was detected at the same time in both groups. The results of this study indicate that both genetic groups have similar growth patterns and ovarian activities.

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Biografia do Autor

Gilson de Mendonça, Universidade Federal de Pelotas
Instituto de Biologia/Departamento de Fisiologia
Pablo Tavares Costa, Universidade Federal de Pelotas
Departamento de Zootecnia
Rômulo Tavares Costa, Universidade Federal de Pelotas
Departamento de Zootecnia
Marina Benedetti, Universidade Federal de Pelotas
Departamento de Zootecnia
Maurício Cardozo Machado, Universidade Federal de Pelotas
Departamento de Zootecnia
Publicado
2017-07-01
Seção
Original Articles / Artigos de Pesquisa