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

Fernanda Dornelles Feijó, Gilson de Mendonça, Pablo Tavares Costa, Rômulo Tavares Costa, Marina Benedetti, Maurício Cardozo Machado

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.


Palavras-chave


estrus; morphometry; plasma progesterone; puberty

Texto completo:

PDF (English)


DOI: http://dx.doi.org/10.21708/avb.2017.11.2.6556

Apontamentos

  • Não há apontamentos.





Acta Veterinaria Brasilica
 
Universidade Federal Rural do Semi-Árido
Pró-Reitoria de Pesquisa e Pós-Graduação

Av. Francisco Mota, nº 572 - Bairro Costa e Silva  Mossoró - RN

CEP: 59.625-900