Einarsson S, Larsson K, Ersmar M
Acta Vet Scand. 1978;19(1):156-8. doi: 10.1186/BF03547653.
A number of factors such as breed, feeding and management are considered to influence the attainment of puberty in gilts. The season of birth also has been indicated as a source of the variation in age at puberty (e.g. 1976). The chronological age is considered to be of greater importance than live weight ( 1972), but severely restricted feeding delays puberty. The recommendation in Sweden is to breed the gilts during their second or third estrus. No information is, however, available concerning the age at puberty of Swedish crossbred gilts of today. The object of the present investigation was to investigate the age at puberty of Swedish crossbred gilts by the use of careful heat checking and analyses of peripheral blood plasma levels of progesterone.
许多因素，如品种、饲养和管理，被认为会影响后备母猪青春期的到来。出生季节也被指出是青春期年龄变化的一个因素（例如，1976年）。按时间顺序计算的年龄被认为比体重更重要（1972年），但严重限制饲养会延迟青春期。瑞典的建议是在后备母猪第二次或第三次发情时进行配种。然而，目前没有关于当今瑞典杂交后备母猪青春期年龄的信息。本研究的目的是通过仔细的发情检查和分析外周血血浆孕酮水平来研究瑞典杂交后备母猪的青春期年龄。
