Sex-ratio in polwarth and corriedale lambs

Authors

  • Paulo Roberto Otto Universidade de São Paulo, Departamento de Biologia, São Paulo, SP
  • Domingos Sanchez Roda Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Agência Paulista de Tecnologia dos Agronegócios, Instituto de Zootecnia, Nova Odessa, SP

Keywords:

Corriedale lambs, Polwarth, Sex-ratio

Abstract

The sex-ratio was determined for samples of Powarth (2,347 individuals) and Corriedale (1,346 individuals) lambs born and reared at the Posto de Ovinos e Caprinos, Instituto de Zootecnia, Secretaria de Agricultura do Estado de São Paulo (Itapetininga, São Paulo) from 1972 to 1987. For Polwarth lambs the secondary sex-ratio (expressed as proportion of males) was 0.497, the corresponding figure for Corriedale lambs being 0.479. These figures do not differ significantly from each other or from the expected proportion of males of 0.5. The annual values observed, which ranged from 0.406 to 0.568 for Polwarth and from 0.370 to 0.569 for Corriedale lambs, can be ascribed to random sample fluctuations.

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Published

2013-12-05

Issue

Section

ANIMAL BREEDING

How to Cite

Sex-ratio in polwarth and corriedale lambs. (2013). Bulletin of Animal Husbandry, 54(2), 29-32. http://bia.iz.sp.gov.br/index.php/bia/article/view/959

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