SciELO - Scientific Electronic Library Online

vol.44 número3Relationship between production characteristics and breeding potential of 25-month old extensively managed Bonsmara bullsInteractive effect of dietary protein level and zilpaterol hydrochloride on feedlot performance and meat quality of steers índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados



Links relacionados

  • Em processo de indexaçãoCitado por Google
  • Em processo de indexaçãoSimilares em Google


South African Journal of Animal Science

versão On-line ISSN 2221-4062
versão impressa ISSN 0375-1589


MATEBESI-RANTHIMO, P.A.M; CLOETE, S.W.P; VAN WYK, J.B  e  OLIVIER, J.J. The relationships between faecal worm egg count and subjectively assessed wool and conformation traits in the Tygerhoek Merino flock. S. Afr. j. anim. sci. [online]. 2014, vol.44, n.3, pp.220-227. ISSN 2221-4062.

Subjectively assessed wool and conformation traits form part of the selection objective in wool sheep enterprises. The present study investigated the genetic, phenotypic and environmental correlations for nematode resistance (using faecal worm egg count (FEC)) with subjectively assessed wool and conformation traits. The Merino sheep flock (consisting of four lines) maintained on Tygerhoek Research Farm was used. Fixed effects of selection line, birth type, sex, age of dam in years, year of birth, and sex*birth year interaction had a significant effect on all subjective traits. At genetic level, log transformed FEC was significantly related to wool oil only at 0.18 ± 0.09, staple formation at 0.29 ± 0.10, and topline at -0.33 ± 0.11. These correlations suggested that sheep with high FEC are likely to have excessive wool oil, thicker and bulkier staples, and lower scores for topline. Selection for resistance to and resilience against nematodes in Merino sheep thus will not result in marked unfavourable correlated responses in the vast majority of these subjective wool and body conformation traits.

Palavras-chave : Linearly assessed traits; faecal worm egg count; conformation; correlations.

        · texto em Inglês     · Inglês ( pdf )


Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons