Influence of decreased length of different spectral photoperiods on testis development of domestic fowl.

were subjected to a decrease in hours ofclear, red, blue and green photoperiods. The decrease in photoperiod length of clear and red light inhibited testis development and spermatogenesis. The decrease in photoperiod length in blue and green light failed to show the inhibitory effect. Pituitary gonadotrophin activity indicated that both production and release ofgonadotrophins were inhibited by decreased hours of clear and red light.

[1]  J. Lauber,et al.  Sexual maturity and subsequent reproductive performance of white leghorn chickens subjected to different parts of the light spectrum. , 1969, Poultry science.

[2]  P. Harrison,et al.  Light Induced Exophthalmos in the Domestic Fowl.∗ † , 1967, Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine.

[3]  J. Benoit.  THE ROLE OF THE EYE AND OF THE HYPOTHALAMUS IN THE PHOTOSTIMULATION OF GONADS IN THE DUCK , 1964, Annals of the New York Academy of Sciences.

[4]  R. W. Lowe,et al.  Effect of various light treatments during growing period on egg production of October hatched White Leghorn pullets. , 1964 .

[5]  J. Mcginnis,et al.  Effect of Light on Economic and Physiological Characters of Laying Hens , 1963 .

[6]  R. B. Herrick,et al.  Gonadotropic activity of chicken pituitary glands. , 1962, Endocrinology.

[7]  J. Mcginnis,et al.  Influence of Different Photoperiods During Brooding and Rearing on Subsequent Productive Characteristics in Chickens , 1961 .

[8]  D. F. King.  Effects of Increasing, Decreasing, and Constant Lighting Treatments on Growing Pullets , 1961 .

[9]  T. Morris,et al.  Artificial Light and Sexual Maturity in the Fowl , 1958, Nature.

[10]  C. Shellabarger.  Observations of the Pineal in the White Leghorn Capon and Cockerel , 1953 .

[11]  A. Ringoen.  Effects of continuous green and red light illumination on gonadal response in the English sparrow, Passer domesticus (Linnaeus) , 1942 .

[12]  T. C. Byerly,et al.  CHICK TESTIS WEIGHT RESPONSE TO GONADOTROPIC HORMONE , 1938 .

[13]  H. M. Scott,et al.  Light in Relation to the Experimental Modification of the Breeding Season of Turkeys , 1937 .

[14]  E. Dakan.  Light absorption, feed consumption, and the urge to lay. , 1934 .

[15]  T. H. Bissonnette.  Studies on the Sexual Cycle in Birds. VI. Effects of White, Green, and Red Lights of Equal Luminous Intensity on the Testis Activity of the European Starling (Sturnus vulgaris) , 1932, Physiological Zoology.