7Ebling F J P. The neuroendocrine timing of puberty[J]. Reproduction, 2005,129 (6) : 675-683. K.
8alantaridou S N, Chrousos G P. Monogenic disorders of puberty [J]. J Clin Endocrinol Metab, 2002, 87(6) :2481-2494.
9Rydhmer L, Eliasson Selling L, Johansson J, et al. A genetic study of estrus symptoms at puberty and their relationship to growth and leanness in gilts[J]. Journal of Animal Science, 1994,72:1964.
10King R H. Effect of live weight and body composition of gilts at 24 weeks of age on subsequent reproductive efficiency[J]. Anita Prod, 1989,49 : 109-115.