The Relation between the Hatching Time and the Sex-ratio in Japanese Quail

1972 ◽  
Vol 9 (2) ◽  
pp. 102-103
Author(s):  
Kenji Ichinoe ◽  
Osamu Yamamuro ◽  
Shozo Suzuki
Keyword(s):  
Sex Ratio ◽  
Japanese Quail ◽  
Hatching Time

Changes in serum concentrations of steroids during embryonic and post-hatching development of male and female Japanese quail (Coturnix coturnix japonica)

1988 ◽  
Vol 118 (1) ◽  
pp. 127-134 ◽  
Author(s):  
M. Schumacher ◽  
J. Sulon ◽  
J. Balthazart
Keyword(s):  
Japanese Quail ◽  
Reproductive Behaviour ◽  
Coturnix Japonica ◽  
Coturnix Coturnix Japonica ◽  
Serum Concentrations ◽  
Male And Female ◽  
Coturnix Coturnix ◽  
Hatching Time ◽  
Embryonic Life ◽  
Age Range

ABSTRACT Serum concentrations of testosterone, 5α-dihydrotestosterone, oestradiol and progesterone were measured by radioimmunoassay combined with Celite chromatography in male and female Japanese quail (Coturnix coturnix japonica) during the second half of embryonic life (days 9–17 of incubation) and during the first 5 weeks after hatching. The mean level of each of the four steroids was significantly affected by the age of the birds. An overall effect of sex was detected by analysis of variance only on oestradiol concentrations, with females having higher serum concentrations than males during most of the age range studied. Significant peaks of testosterone and progesterone were also detected around hatching time. These results are consistent with the view that oestradiol is the major hormone implicated in the sexual differentiation of reproductive behaviour in the quail. The relationships between the circulating concentrations of oestradiol during ontogeny and the critical period of differentiation as postulated by currently accepted models is also discussed. J. Endocr. (1988) 118, 127–134

scholarly journals Karyological sexing and sex ratio of Japanese quail embryos.

1985 ◽  
Vol 31 (4) ◽  
pp. 236-243 ◽  
Author(s):  
Midori YOSHIZAWA ◽  
Ikumi NOGUCHI ◽  
Takashi MURAMATSU ◽  
Akira OKAMOTO
Keyword(s):  
Sex Ratio ◽  
Japanese Quail

scholarly journals The Relation between the Hatching Time and the Sex-Ratio in Chicks

1968 ◽  
Vol 5 (4) ◽  
pp. 190-197 ◽  
Author(s):  
KENJI ICHINOE ◽  
EIICHIRO OHTA ◽  
SHOZO SUZUKI
Keyword(s):  
Sex Ratio ◽  
Hatching Time

scholarly journals Long-Term Exposure to Benzo[a]Pyrene Affects Sexual Differentiation and Embryos Toxicity in Three Generations of Marine Medaka (Oryzias Melastigma)

2020 ◽  
Vol 17 (3) ◽  
pp. 970 ◽  
Author(s):  
Dong Sun ◽  
Qi Chen ◽  
Bo Zhu ◽  
Yu Lan ◽  
Shunshan Duan
Keyword(s):  
Sex Ratio ◽  
Sexual Differentiation ◽  
Endocrine Disorders ◽  
Marine Medaka ◽  
Offspring Sex Ratio ◽  
Reproductive Genes ◽  
Hatching Time ◽  
Embryo Toxicity ◽  
High Concentrations ◽  
Embryonic Toxicity

Benzo[a]pyrene (BaP) is a common environmental disrupting chemical that can cause endocrine disorders in organisms. However, the continued interference effects of BaP on multi-generation fish needs further research. In this study, we performed different periods (G1F1-3, G2F2-3, G3F3) of BaP exposure on marine medaka. We determined the embryo toxicity, and analyzed relative reproductive genes (ERα, cyp19a and vtg1) to predict the sexual differentiation of marine medaka. The results showed that high concentrations of BaP (200 μg·L−1) significantly delayed the hatching time of embryos. Moreover, medium/high concentrations of BaP (20 and 200 μg·L−1) prolonged the sexual maturity time of marine medaka. The relative gene expression of ERα, cyp19a and vtg1 were measured at 5 dpf of embryos. We found that BaP had significantly inhibited the expression of the genes related to female fish development. Consequently, there were more males in the offspring sex ratio at BaP exposure. Overall, BaP can cause embryonic toxicity and abnormal sexual differentiation, while the expression of related reproductive genes can effectively indicate the sex ratio.

scholarly journals The Relation between the Hatching Time and the Sex-Ratio in Chicks

1967 ◽  
Vol 4 (4) ◽  
pp. 201-206 ◽  
Author(s):  
KENJI ICHINOE ◽  
EIICHIRO OHTA ◽  
TOSHIO MAKABE ◽  
TATSUO ICHIGE ◽  
SHOZO SUZUKI
Keyword(s):  
Sex Ratio ◽  
Hatching Time

scholarly journals The Relation between the Hatching Time and the Sex-ratio in Chicks

1972 ◽  
Vol 9 (2) ◽  
pp. 70-78 ◽  
Author(s):  
KENJI ICHINOE ◽  
EIICHIRO OHTA ◽  
TOSHIO MAKABE ◽  
SHOZO SUZUKI
Keyword(s):  
Sex Ratio ◽  
Hatching Time

scholarly journals The Relationship between Hatching Time and Sex-ratio in Chicks

1973 ◽  
Vol 52 (4) ◽  
pp. 1584-1592 ◽  
Author(s):  
Kenji Ichinoe
Keyword(s):  
Sex Ratio ◽  
Hatching Time ◽  
The Relationship
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