Department of Veterinary Medicine, Nihon University, Fujisawa, Japan.
Anim Sci J. 2012 Sep;83(9):644-9. doi: 10.1111/j.1740-0929.2012.01012.x. Epub 2012 Mar 13.
Blood estrone sulfate (E(1) S), estrone (E(1) ), estradiol (E(2) ) and progesterone (P(4) ) in newborn piglets were measured to clarify the relationships among birth and placental weight, vitality of offspring and litter size. First, the association between vital status (normal, weak and stillborn) from 165 newborn piglets of 18 litters and steroid concentrations; second, steroid concentrations from 152 newborn normal piglets and litter size; and third, steroid content in fetal placenta from 50 newborn normal piglets of six litters and litter size, were investigated. In the normal group, the birth and placental weight were significantly higher than those in the other groups. Blood E(1) S levels in the stillborn group were significantly lower, whereas E(1) , E(2) and P(4) were significantly higher compared to the normal group. Blood and placental E(1) S levels in the small litter group were significantly higher than those in the other groups. However, there was no significant difference among the three litter size groups in the levels of steroid hormones in maternal blood. These results indicate that vitality of newborn piglets is related to E(1) S concentration of neonate, to birth weight and placental weight. However, steroid hormone concentrations of newborn piglets were greatly affected by the number of littermates.
为了阐明出生和胎盘重量、后代活力和窝产仔数之间的关系，测定了新生仔猪的血雌酮硫酸酯（E(1) S）、雌酮（E(1)）、雌二醇（E(2)）和孕酮（P(4)）。首先，调查了 18 窝 165 头新生仔猪的活力状况（正常、虚弱和死产）与类固醇浓度之间的关系；其次，调查了 152 头正常新生仔猪的类固醇浓度与窝产仔数之间的关系；第三，调查了 6 窝 50 头正常新生仔猪的胎儿胎盘类固醇含量与窝产仔数之间的关系。在正常组中，出生体重和胎盘重量显著高于其他组。死产组的血 E(1) S 水平显著降低，而 E(1)、E(2)和 P(4)水平显著高于正常组。小窝产仔数组的血和胎盘 E(1) S 水平显著高于其他组。然而，母血中类固醇激素水平在三个窝产仔数组之间没有显著差异。这些结果表明，新生仔猪的活力与新生儿的 E(1) S 浓度、出生体重和胎盘重量有关。然而，新生仔猪的类固醇激素浓度受同窝仔数的影响很大。
