Thompson D L, Johnson L, Wiest J J
Department of Animal Science, Louisiana State University Agricultural Center, Baton Rouge 70803.
J Reprod Fertil Suppl. 1987;35:67-70.
Prolactin concentrations in stallion serum were measured by a newly developed radioimmunoassay based on anti-dog prolactin serum and radiolabelled horse prolactin. Samples of serum from a total of 444 stallions were obtained at a commercial abattoir monthly from April to the following March. Ages of stallions were estimated from eruption and wear patterns of incisors. In the analysis of variance, both month (P less than 0.01) and age (P less than 0.05) were significant sources of variation whereas there was no interaction between these factors. Monthly means for prolactin concentrations were greatest between May and August with peak concentrations occurring in July (7.1 +/- 0.5 ng/ml). Lowest mean concentrations of prolactin (1.2 ng/ml) were observed during the winter months (December and January). Concentrations of prolactin were lowest in stallions less than or equal to 5 years old and were highest in stallions greater than 10 years old. It appears that prolactin secretion in the stallion is strongly influenced by season, as it is in the mare and in other seasonally breeding animals. Moreover, prolactin secretion in the stallion tends to increase as the stallion ages.
采用一种基于抗犬催乳素血清和放射性标记马催乳素的新开发的放射免疫分析法，测定种马血清中的催乳素浓度。从4月到次年3月，每月在一家商业屠宰场采集总共444匹种马的血清样本。根据门齿的萌出和磨损模式估计种马的年龄。在方差分析中，月份（P<0.01）和年龄（P<0.05）都是显著的变异来源，而这些因素之间没有相互作用。催乳素浓度的月度均值在5月至8月间最高，7月出现峰值浓度（7.1±0.5纳克/毫升）。在冬季月份（12月和1月）观察到催乳素的最低平均浓度（1.2纳克/毫升）。催乳素浓度在小于或等于5岁的种马中最低，在大于10岁的种马中最高。种马的催乳素分泌似乎受季节的强烈影响，就像母马和其他季节性繁殖动物一样。此外，种马的催乳素分泌往往随着种马年龄的增长而增加。
