Sexual Development of Coturnix as Affected by Changes in Photoperiods

Effect of Photoperiods on Early Growth of Gonads and on Potency of Gonadotropins of the Anterior Pituitary in Coturnix

“…In contrast, all birds in the other six light regimens showed an increase in mean weight of testes or ovaries. The fact that photoperiods longer than 12 hours per 24 hours stimulated the growth of testes and ovaries is not surprising, since some of the photoperiods previously had been shown to stimulate testicular growth and egg production (Wilson et al, 1962) in coturnix. A comparison of the effects of 3L:3D, 4L:4D, and 6L:6D with the effect of 12L:12D is of interest.…”

Estrogenic effects of the enantiomers of o,p′-DDT in Japanese quail

“…Groups of 10-15 birds were placed in steel wire cages (55 x 32 x 31 cm) and given food (turkey starter; Federated Co-operatives, Ltd.) and water ad libitum. The temperature of the experimental room was kept at 19-21°C and the light regime was 8 h light (L): 16 h dark (D) per 24 h), a photoperiod known to be non-stimulatory for sexual maturation in Japanese quail (Tanaka et al 1965;Wilson et al 1962).…”

“…important to determine whether the estrogenic activity of o,pf-DDT could be observed in male quail under the conditions of a controlled photoperiod (Follett and Farner 1966;Wilson et al 1962).…”

Feed Pigments

“…They were fed a commercial turkey breeder diet prior to being allotted to the experimental treatments. The basal diet used in these experiments (Table 1) was similar to a turkey breeder diet, since Wilson et al (1962) reported the nutritional requirements of the Japanese quail are similar to those of the turkey. It contained ingredients that supplied a minimum amount of natural pigments.…”