Breeding system can affect the offspring sex ratio in Syrian hamsters


Autoria(s): CHELINI, M. O. M.; SOUZA, N. L.; OTTA, E.
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

20/10/2012

20/10/2012

2011

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

http://dx.doi.org/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