Breeding system can affect the offspring sex ratio in Syrian hamsters
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
20/10/2012
20/10/2012
2011
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Resumo |
Nulliparous female Syrian hamsters were used to investigate the effect of two different breeding systems on the fertility of the female Syrian hamster. We hypothesized that females submitted to a harem system (HS) would deliver smaller and more female-biased litters than in a monogamic system. Ten female and 10 adult male hamsters housed individually (G1) were kept in a monogamic temporary breeding system, while 10 females and five males (G2) were submitted to HS with two females and a male permanently housed together since female weaning. Females from G1 and G2 delivered, respectively, 47 and 50 litters, and produced 364 (G1) and 383 (G2) weaned pups without any difference in litter size, mean weight of weaned pups and body condition of dams. Interparturition intervals were shorter and the percentage of male pups per litter was higher in the HS possibly as a result of different endocrine conditions provided by different breeding systems. Besides providing evidence that housing conditions can influence the sex of hamster offspring, our findings suggest a mechanism for the non-random distribution of male and female pups in hamster litters. FAPESP Fundacao de Amparo a Pesquisa do Estado de Sao Paulo[00/00282-6] Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) |
Identificador |
LABORATORY ANIMALS, v.45, n.1, p.55-57, 2011 0023-6772 http://producao.usp.br/handle/BDPI/32141 10.1258/la.2010.010099 |
Idioma(s) |
eng |
Publicador |
ROYAL SOC MEDICINE PRESS LTD |
Relação |
Laboratory Animals |
Direitos |
restrictedAccess Copyright ROYAL SOC MEDICINE PRESS LTD |
Palavras-Chave | #Hamster #reproduction #sex ratio #breeding system #PARENTAL HORMONE-LEVELS #MESOCRICETUS-AURATUS #TIME #CONCEPTION #STRESS #BIRTH #Veterinary Sciences #Zoology |
Tipo |
article original article publishedVersion |