The influence of exogenous estradiol on bobwhite quail (Colinus virginianus) reproductive systems

Productive Performance and Histological Responses of Japanese Quail Breeders to Age at Mating and Silver Nanoparticles Administration

“…Moreover, the increase in oviduct percentage of young females might be attributed to the increase in plasma levels of sex steroid hormones that are responsible for the development of the oviduct in terms of hyperplasia of the epithelium lining of all segments, submucosal development of tubular glands coincident with the increase in the synthesis and accumulation of the specific water-soluble protein. This is in close agreement with the findings of many workers who stated that estrogen (either endogenous or exogenous) promotes the formation of tubular secretary glands and induces the synthesis of ovalbumin, conalbumin, ovomucoid and avidin (Pageaux et al, 1984;Lien et al, 1985;Abdel-Fattah, 1999;El-Afifi and Abo-Taleb, 2002;Holmes et al, 2003., Ottinger et al, 2004. The lack of the significant influence of males age on testes relative weight in the present study could be explained by the fact that male quails undergo gradual reproductive decline, in contrast, to females.…”

Productive Performance and Histological Responses of Japanese Quail Breeders to Age at Mating and Silver Nanoparticles Administration

“…Moreover, the increase in oviduct percentage of young females might be attributed to the increase in plasma levels of sex steroid hormones that are responsible for the development of the oviduct in terms of hyperplasia of the epithelium lining of all segments, submucosal development of tubular glands coincident with the increase in the synthesis and accumulation of the specific water-soluble protein. This is in close agreement with the findings of many workers who stated that estrogen (either endogenous or exogenous) promotes the formation of tubular secretary glands and induces the synthesis of ovalbumin, conalbumin, ovomucoid and avidin (Pageaux et al, 1984;Lien et al, 1985;Abdel-Fattah, 1999;El-Afifi and Abo-Taleb, 2002;Holmes et al, 2003., Ottinger et al, 2004. The lack of the significant influence of males age on testes relative weight in the present study could be explained by the fact that male quails undergo gradual reproductive decline, in contrast, to females.…”

Effects of Dietary and Parenteral Estrogens on Bobwhite Reproduction

“…Because a dietary dosage 100 times this amount was the only level of E 2 B that prevented egg production in Exeriment 1, it appeared that injected E 2 B was approximately 100 times more potent than dietary E 2 B. By comparison, Lien et al (1985) reported 10 to 50-times greater dosages of dietary E 2 B were required to produce oviduct growth responses in bobwhites equivalent to those obtainted by injected E 2 B in this study.…”

Effect of estradiol-17β on follicle-stimulating hormone secretion and egg-laying performance of Japanese quail

“…Treatment of immature Japanese quail with E 2 increases BW and enhances growth of the oviduct, formation of tubular secretory glands, epithelial cell differentiation and causes early sexual maturation (Lien et al, 1985;Forgó et al, 1996). Estradiol-17b (E 2 ) initiates mRNA expression and synthesis of albumen proteins from the oviduct (Pennequin et al, 1978;Stevens, 1991;Salomaa et al, 1992).…”

“…Estradiol (E 2 ) is a main reproductive hormone affecting growth, development, maturation and functioning of reproductive tract, as well as the sexual differentiation and the behavior (Lien et al, 1985;Laugier et al, 1988;Balthazart et al, 2009). It is an intraovarian factor affecting the function of hypothalamus, pituitary, liver, skeleton and calcium (Ca) homeostasis (Connolly and Callard, 1987;Williams et al, 1991;Turner et al, 1994).…”

Productive Performance and Histological Responses of Japanese Quail Breeders to Age at Mating and Silver Nanoparticles Administration

“…Moreover, the increase in oviduct percentage of young females might be attributed to the increase in plasma levels of sex steroid hormones that are responsible for the development of the oviduct in terms of hyperplasia of the epithelium lining of all segments, submucosal development of tubular glands coincident with the increase in the synthesis and accumulation of the specific water-soluble protein. This is in close agreement with the findings of many workers who stated that estrogen (either endogenous or exogenous) promotes the formation of tubular secretary glands and induces the synthesis of ovalbumin, conalbumin, ovomucoid and avidin (Pageaux et al, 1984;Lien et al, 1985;Abdel-Fattah, 1999;El-Afifi and Abo-Taleb, 2002;Holmes et al, 2003., Ottinger et al, 2004. The lack of the significant influence of males age on testes relative weight in the present study could be explained by the fact that male quails undergo gradual reproductive decline, in contrast, to females.…”

Effects of Dietary and Parenteral Estrogens on Bobwhite Reproduction

“…Because a dietary dosage 100 times this amount was the only level of E 2 B that prevented egg production in Exeriment 1, it appeared that injected E 2 B was approximately 100 times more potent than dietary E 2 B. By comparison, Lien et al (1985) reported 10 to 50-times greater dosages of dietary E 2 B were required to produce oviduct growth responses in bobwhites equivalent to those obtainted by injected E 2 B in this study.…”

Effect of estradiol-17β on follicle-stimulating hormone secretion and egg-laying performance of Japanese quail

“…Treatment of immature Japanese quail with E 2 increases BW and enhances growth of the oviduct, formation of tubular secretory glands, epithelial cell differentiation and causes early sexual maturation (Lien et al, 1985;Forgó et al, 1996). Estradiol-17b (E 2 ) initiates mRNA expression and synthesis of albumen proteins from the oviduct (Pennequin et al, 1978;Stevens, 1991;Salomaa et al, 1992).…”

“…Estradiol (E 2 ) is a main reproductive hormone affecting growth, development, maturation and functioning of reproductive tract, as well as the sexual differentiation and the behavior (Lien et al, 1985;Laugier et al, 1988;Balthazart et al, 2009). It is an intraovarian factor affecting the function of hypothalamus, pituitary, liver, skeleton and calcium (Ca) homeostasis (Connolly and Callard, 1987;Williams et al, 1991;Turner et al, 1994).…”

Productive Performance and Histological Responses of Japanese Quail Breeders to Age at Mating and Silver Nanoparticles Administration

“…Moreover, the increase in oviduct percentage of young females might be attributed to the increase in plasma levels of sex steroid hormones that are responsible for the development of the oviduct in terms of hyperplasia of the epithelium lining of all segments, submucosal development of tubular glands coincident with the increase in the synthesis and accumulation of the specific water-soluble protein. This is in close agreement with the findings of many workers who stated that estrogen (either endogenous or exogenous) promotes the formation of tubular secretary glands and induces the synthesis of ovalbumin, conalbumin, ovomucoid and avidin (Pageaux et al, 1984;Lien et al, 1985;Abdel-Fattah, 1999;El-Afifi and Abo-Taleb, 2002;Holmes et al, 2003., Ottinger et al, 2004. The lack of the significant influence of males age on testes relative weight in the present study could be explained by the fact that male quails undergo gradual reproductive decline, in contrast, to females.…”

Effects of Dietary and Parenteral Estrogens on Bobwhite Reproduction

“…Because a dietary dosage 100 times this amount was the only level of E 2 B that prevented egg production in Exeriment 1, it appeared that injected E 2 B was approximately 100 times more potent than dietary E 2 B. By comparison, Lien et al (1985) reported 10 to 50-times greater dosages of dietary E 2 B were required to produce oviduct growth responses in bobwhites equivalent to those obtainted by injected E 2 B in this study.…”

Effect of estradiol-17β on follicle-stimulating hormone secretion and egg-laying performance of Japanese quail

“…Treatment of immature Japanese quail with E 2 increases BW and enhances growth of the oviduct, formation of tubular secretory glands, epithelial cell differentiation and causes early sexual maturation (Lien et al, 1985;Forgó et al, 1996). Estradiol-17b (E 2 ) initiates mRNA expression and synthesis of albumen proteins from the oviduct (Pennequin et al, 1978;Stevens, 1991;Salomaa et al, 1992).…”

“…Estradiol (E 2 ) is a main reproductive hormone affecting growth, development, maturation and functioning of reproductive tract, as well as the sexual differentiation and the behavior (Lien et al, 1985;Laugier et al, 1988;Balthazart et al, 2009). It is an intraovarian factor affecting the function of hypothalamus, pituitary, liver, skeleton and calcium (Ca) homeostasis (Connolly and Callard, 1987;Williams et al, 1991;Turner et al, 1994).…”