Louis G F, Lewis A J, Weldon W C, Ermer P M, Miller P S, Kittok R J, Stroup W W
Department of Animal Science, University of Nebraska, Lincoln 68583-0908.
J Anim Sci. 1994 Aug;72(8):2051-60. doi: 10.2527/1994.7282051x.
To determine the effect of energy and protein intakes on boar libido, semen characteristics, and plasma hormone concentrations, 24 crossbred boars (1 yr of age) were allotted to one of three dietary treatments. Two protein levels (7.7 and 18.1 g/d of lysine) and two energy levels (6.1 and 7.7 Mcal/d of ME) were combined to create 1) low-energy and low-protein (ep), 2) low-energy and high-protein (eP), and 3) high-energy and high-protein (EP) treatments. Semen was collected two times per week for 27 wk. During wk 28, blood samples were collected before and after a intravenous injection of GnRH (375 ng/kg of BW). The EP boars had higher (P < .01) ADG than the eP boars (373 vs 169 g), which had higher (P < .01) ADG than the ep boars (169 vs 92 g). Fewer EP and eP boars (zero of eight and two of eight, respectively) than ep boars (five of eight) consistently refused to mount the collection dummy (P < .05). During the final 20 wk of the semen-collection period, EP and eP boars had 33% longer durations of ejaculation (P < .04), had 60% greater semen and gelatinous fraction volumes (P < .03), but had 25% lower sperm concentration in their semen (P < or = .12) than ep boars. The EP boars produced 38% more sperm than the ep boars (P < .10). Baseline LH concentration, LH pulse frequency, LH pulse amplitude, testosterone concentration, and estradiol-17 beta concentrations were not affected by treatment (P > .10).(ABSTRACT TRUNCATED AT 250 WORDS)
为确定能量和蛋白质摄入量对公猪性欲、精液特性及血浆激素浓度的影响，将24头杂交公猪（1岁）分配至三种日粮处理之一。两种蛋白质水平（赖氨酸分别为7.7和18.1克/天）和两种能量水平（代谢能分别为6.1和7.7兆卡/天）组合形成1）低能量低蛋白质（ep）、2）低能量高蛋白质（eP）和3）高能量高蛋白质（EP）处理。每周采集精液两次，共27周。在第28周，静脉注射促性腺激素释放激素（GnRH，375纳克/千克体重）前后采集血样。EP组公猪的平均日增重（ADG）高于eP组公猪（分别为373克和169克，P < 0.01），eP组公猪的ADG高于ep组公猪（分别为169克和92克，P < 0.01）。与ep组公猪（8头中有5头）相比，EP组和eP组公猪中持续拒绝爬跨采精假台畜的数量更少（分别为8头中的0头和2头，P < 0.05）。在精液采集期的最后20周，EP组和eP组公猪的射精持续时间长33%（P < 0.04），精液和胶冻部分体积大60%（P < 0.03），但其精液中的精子浓度比ep组公猪低25%（P ≤ 0.12）。EP组公猪产生的精子比ep组公猪多38%（P < 0.10）。基础促黄体生成素（LH）浓度、LH脉冲频率、LH脉冲幅度、睾酮浓度和雌二醇-17β浓度不受处理影响（P > 0.10）。（摘要截短至250字）
