Perkins A, Fitzgerald J A
U.S. Department of Agriculture, Dubois, ID 83423.
J Anim Sci. 1992 Jun;70(6):1787-94. doi: 10.2527/1992.7061787x.
During the breeding season three experiments were conducted to evaluate the LH and testosterone (T) response of rams with male sexual orientation (e.g., male-oriented homosexual rams) to female sheep, to male sheep, and to treatment with LHRH. Male-oriented rams were identified through a series of sexual performance and sexual preference tests. Treatments included exposure to estrous females and to males for 15 min (Exp. 1) and exposure to estrous females and to males for 8 h (Exp. 2). Behavioral responses to stimulus animals were recorded. In Exp. 2 homosexual rams mounted males more than females (P less than .02) and exhibited more flehmen (P less than .002) and investigatory sniffs (P less than .01) when exposed to males vs females. Acts of aggression (butting the stimulus animals) did not differ by gender (P greater than .1). Flehmen and butting were positively correlated to LH secretion (P less than .02) of rams exposed to females but not to males. In Exp. 1, LH concentration determined every 15 min for 6 h was not affected (P greater than .05) by the gender of the stimulus animal. In Exp. 2, LH pulse frequency and concentration were similar (P greater than .05) by treatment. Lack of an LH response to sexual activity in homosexual rams was not a result of pituitary or gonadal insensitivity; within 1 h of a single injection of LHRH both LH and T increased (Exp. 3).(ABSTRACT TRUNCATED AT 250 WORDS)
在繁殖季节进行了三项实验，以评估具有男性性取向的公羊（例如，雄性取向的同性恋公羊）对母羊、公羊以及促性腺激素释放激素（LHRH）处理的促黄体生成素（LH）和睾酮（T）反应。通过一系列性行为表现和性偏好测试来识别雄性取向的公羊。处理方式包括让其接触发情母羊和公羊15分钟（实验1）以及接触发情母羊和公羊8小时（实验2）。记录对公羊刺激动物的行为反应。在实验2中，同性恋公羊对公羊的爬跨多于母羊（P小于0.02），并且在接触公羊与母羊时，表现出更多的卷唇反应（P小于0.002）和探究性嗅闻（P小于0.01）。攻击行为（顶撞刺激动物）在性别上没有差异（P大于0.1）。卷唇反应和顶撞行为与接触母羊而非公羊的公羊的LH分泌呈正相关（P小于0.02）。在实验1中，刺激动物的性别对6小时内每15分钟测定一次的LH浓度没有影响（P大于0.05）。在实验2中，不同处理方式下的LH脉冲频率和浓度相似（P大于0.05）。同性恋公羊对性活动缺乏LH反应并非垂体或性腺不敏感所致；单次注射LHRH后1小时内LH和T均增加（实验3）。（摘要截断于250字）
