Nutritional restriction in lactating primiparous sows selectively affects female embryo survival and overall litter development.
Reprod Fertil Dev
; 18(3): 347-55, 2006.
Article
em En
| MEDLINE
| ID: mdl-16554010
ABSTRACT
This study explored the possibility of sex-specific effects on embryonic survival in primiparous sows subjected to restricted feed intake during the last week of lactation and bred after weaning (Restrict; n = 16), compared with control sows fed close to ad libitum feed intakes (Control; n = 17). Restrict sows were in a substantial negative net energy balance at weaning, and lost 13% of estimated protein and 17% of fat mass during lactation, yet the weaning-to-oestrous interval and ovulation rate were not different between treatments. However, embryonic survival at Day 30 of gestation was lower (P < 0.05) in Restrict than Control sows, and selectively reduced the proportion of female embryos surviving (P < 0.01). A decrease in weight and crown-rump length of surviving female (P < 0.05) and male (P < 0.05) embryos was seen in Restrict litters. The mechanisms mediating this sex-specific effect on embryonic loss in feed-restricted sows are unclear. The data presented here indicate that feed-restriction during the last week of lactation in primiparous sows causes a selective decrease in survival of female embryos and limits the growth of all surviving embryos.
Buscar no Google
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Sus scrofa
/
Fenômenos Fisiológicos da Nutrição Pré-Natal
/
Desenvolvimento Embrionário
Limite:
Animals
/
Pregnancy
Idioma:
En
Revista:
Reprod Fertil Dev
Assunto da revista:
MEDICINA REPRODUTIVA
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
Canadá