Gildersleeve R P, Johnson W A
Poult Sci. 1981 Feb;60(2):453-61. doi: 10.3382/ps.0600453.
Experiments were conducted to determine if sighted and blind plumage color mutants of Japanese quail elicit comparable testicular recrudescence when exposed to long daily photoperiods of low intensity red light. Quail exhibiting testicular regression after exposure to 8 hr of light daily for several weeks were blinded via bilateral ocular enucleation. A control group was not enucleated. Two light intensities, 1.4 and 2.8 lx, were applied to half of the birds in each group during a 16 hr daily photoperiod for several weeks. Enucleated birds and birds under the 2.8 lx intensity had greater testis weights than the controls. Birds were also blinded by optic tract sectioning, and a .7 lx red light intensity treatment was included. Greater testis weights were found in birds under higher light intensities. Three plumage pigmentation mutants, sex linked incomplete albino, white and wild-type, were exposed to 8 hr of light daily for either 4 or 8 weeks to induce testicular regression. They were then exposed to the three light intensities for 3 weeks. Higher intensities and albinism resulted in greater testicular recrudescence only when the regression interval was 8 weeks, even though testicular regression appeared after 4 weeks. The absence of eyes or plumage pigmentation, resulting in an increased exposure of the encephalon for extraretinal light reception, may have effected greater testicular recrudescence. Severed optic tracts with tract eyes did not produce this response to light, indicating that the eyes may play a role in mediating the photosexual reflex in quail. Lower intensities may have resulted in reduced tissue penetration and testicular growth. A definite threshold intensity necessary to elicit testis growth was not found.
进行了实验，以确定日本鹌鹑的有视力和失明的羽毛颜色突变体在暴露于低强度红光的长日照光周期时是否能引发相当的睾丸再发育。将连续数周每天暴露于8小时光照后出现睾丸退化的鹌鹑通过双侧眼球摘除使其失明。对照组未进行摘除。在每天16小时的光照周期中，对每组中的一半鹌鹑施加1.4勒克斯和2.8勒克斯两种光照强度，持续数周。摘除眼球的鹌鹑和处于2.8勒克斯光照强度下的鹌鹑睾丸重量比对照组更大。还通过切断视束使鹌鹑失明，并设置了0.7勒克斯的红光强度处理。在较高光照强度下的鹌鹑睾丸重量更大。三种羽毛色素沉着突变体，即性连锁不完全白化、白色和野生型，每天暴露于8小时光照下4周或8周以诱导睾丸退化。然后将它们暴露于三种光照强度下3周。仅当退化间隔为8周时，较高强度和白化才导致更大的睾丸再发育，尽管4周后就出现了睾丸退化。眼睛或羽毛色素沉着的缺失导致脑对视网膜外光接收的暴露增加，这可能导致了更大的睾丸再发育。切断视束且保留视束眼的鹌鹑对光没有产生这种反应，这表明眼睛可能在介导鹌鹑的光性反射中起作用。较低强度可能导致组织穿透减少和睾丸生长受限。未发现引发睾丸生长所需的明确阈值强度。
