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O Instituto de Investigação e Tecnologia da Agronomia e Meio Ambiente (IITAA) desenvolve trabalho de investigação com o objetivo de perseguir estudos em diversas áreas, como a caracterização / previsão do clima insular e os efeitos das mudanças globais em comunidades do oceano para os to... Ler mais »

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The ‘ram effect’ as a way of modifying the reproductive activity of the ewe: a review

Agricultura e Produção Animal

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Referência

Rosa, H. J. D. and Bryant, M. J. (2002). The ‘ram effect’ as a way of modifying the reproductive activity of the ewe: a review. Small Ruminant Research, 45(1), 1-16.

Resumo

Abstract The seasonality of breeding activity in sheep represents an important constraint in the breeding program of commercial flocks. The ‘ram effect’ is one among various techniques available to manipulate reproduction during the anoestrous season but with the advantages of being inexpensive, of easy application and free from causing problems to the consumer of animal foods (i.e. hormone residues). The aim of this paper is to summarize the most important aspects of the 'ram effect', including the nature of the ram stimuli involved, the behavioural and physiological events elicited in the ewe as a result of the presence of the ram, the neuroendocrine basis of the phenomenon and the various factors associated with variation in response. The effects of a wide range of social relationships on reproductive activity in sheep and other species are also discussed.

Tera, 31 Dezembro, 2002

Equipa

Henrique José Duarte Rosa
Membro Integrado com contrato

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