Somade B
Beitr Trop Landwirtsch Veterinarmed. 1985;23(1):81-7.
120 young sows of less than one year of age and 240 old sows indigenous to Nigeria were randomly subjected to a 2 X 2 X 2 factorial analysis of variance. The results showed that the factors season, parity, and lactation period had no influence on the gestation period and some weaning features, like the number of stillborn piglets per litter and pre-weaning deaths. More piglets were farrowed live by old sows than by the young sows. The litter birth weight, the number of piglets weaned per litter and the number of days to estrous following weaning depended on the season and the lactation length.
120头年龄小于一岁的年轻母猪和240头尼日利亚本地的老龄母猪被随机进行二因素方差分析（2×2×2）。结果表明，季节、胎次和哺乳期这些因素对妊娠期以及一些断奶特征没有影响，比如每窝死产仔猪数量和断奶前死亡情况。老龄母猪产出的活仔猪比年轻母猪多。每窝仔猪出生体重、每窝断奶仔猪数量以及断奶后发情天数取决于季节和哺乳期长度。
