Berger T, Mahone J P, Svoboda G S, Metz K W, Clegg E D
J Anim Sci. 1980 Sep;51(3):672-8. doi: 10.2527/jas1980.513672x.
Littermate pairs of crossbred boars, barrows and gilts were used to study the effects of an artificially extended photoperiod during decreasing daylength on puberty in boars and on weight gain and feed efficiency. Libido scores of the boars exposed to the extended photoperiod were higher (P < .01) than those of controls at 24 and 26 weeks of age. At 26 weeks of age, semen had been collected from 74% of the boars on supplemental light but from only 26% of the controls. Lighting treatment did not affect semen quality. The number of ejaculates previously collected did affect semen quality. Motility and total sperm per ejaculate increased with increasing ejaculate number, while the percentage of abnormalities appeared to decrease. A second group of boars was delayed in the development of mating behavior, perhaps because of inadvertent consumption of Gibberella zeae-infected corn. The extended photoperiod did not exert a beneficial effect on weight gain or feed efficiency of boars, barrows or gilts.
采用杂交公猪、阉公猪和小母猪的同窝仔对，研究在白昼渐短时人工延长光照周期对公猪青春期以及对公猪、阉公猪和小母猪体重增加和饲料效率的影响。在24周龄和26周龄时，接受延长光照周期的公猪的性欲评分高于对照组（P <.01）。在26周龄时，补充光照的公猪中有74%采集到了精液，而对照组中只有26%。光照处理不影响精液质量。先前采集的射精次数确实会影响精液质量。每次射精的活力和总精子数随射精次数增加而增加，而异常百分比似乎降低。第二组公猪的交配行为发育延迟，可能是因为无意中食用了感染玉米赤霉的玉米。延长光照周期对公猪、阉公猪或小母猪的体重增加或饲料效率没有产生有益影响。
