Precocious sexual maturity and enhanced egg production in chickens given goitrogen at an early age

Singh, Aradhana; Parshad, O

doi:10.1080/00071667808416508

Cited by 8 publications

(5 citation statements)

References 5 publications

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“…They also laid more eggs during the first few weeks of the laying period. These results confirm the findings of Singh & Parshad (1978) who reported that treatment with methimazole, up to 15 weeks of age, caused precocious sexual development in the pullets as judged by ovarian weight and age at maturity. Similar results have been obtained with female mice (Soliman & Reineke, 1952).…”

Section: Discussionsupporting

confidence: 92%

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The Effect of Carbimazole on Growth and Sexual Maturity in the Pullet

Shanawany

Morris

1987

Exp Physiol

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Carbimazole (100 mg/kg diet) was fed to pullets from 8 to 12 or from 12 to 16 weeks of age. Pullets fed carbimazole from 8 to 12 weeks of age matured about 12 d earlier and produced more eggs between 17 and 22 weeks of age. Their body weights and feed intake were significantly lower than those of normal birds. Feeding carbimazole from 12 to 16 weeks of age had no significant effect on the birds except during the course of treatment where their feed consumption was less than that of the controls.

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Section: Discussionsupporting

confidence: 92%

“…Methimazole has been reported by Singh & Parshad (1978) to cause precocious sexual maturity in White Leghorn pullets. Birds fed 100 mg methimazole/kg diet from 2 to 15 weeks of age reached age at first egg 14 d earlier than controls.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Carbimazole on Growth and Sexual Maturity in the Pullet

Shanawany

Morris

1987

Exp Physiol

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“…FSH is known to play an important role in stimulating testicular growth (Brown et al, 1975;Ishii and Furuya, 1975) while thyroid hormones are involved in the regulation of growth (Singh et al, 1968) and sexual development (Ogawa, 1962;Singh and Parshad, 1978). In the present study observations on changes in plasma LH, androgens, prolactin and growth hormone during sexual maturation in the cockerel have been extended to include data on FSH, T 3 and T 4 .…”

Section: Introductionmentioning

confidence: 85%

Plasma concentrations of Luteinising hormone, follicle stimulating hormone, androgen, growth hormone, Prolactin, Thyroxine and Triiodothyronine during growth and sexual development in the cockerel

Sterling

Sharp

Klandorf

et al. 1984

British Poultry Science

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Changes in concentrations of plasma luteinising hormone (LH), follicle stimulating hormone (FSH), androgen, growth hormone (GH), prolactin (Prl), thyroxine (T4) and triiodothyronine (T3) were measured during growth and sexual maturation in broiler cockerels reared in continuous light to 7 weeks and 14 h light/d thereafter. Concentrations of LH and FSH began to increase between 13 and 15 weeks, while those of androgens increased between 16 and 17 weeks. FSH concentration increased faster than that of LH. Concentrations of GH and Prl were high at 3 weeks; that of GH decreasing progressively between 3 and 14 weeks of age and thereafter remaining low, while that of Prl was low between 5 and 9 weeks, relatively high between 10 and 13 weeks, and then temporarily decreasing before increasing progressively during sexual maturation. Concentrations of T3 and T4 were higher in juvenile than in adult birds.

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“…This may be deduced from the finding that precocious gonadal development is induced in 8-9 week chickens fed propylthiouracil or methimazole from hatch to induce hypothyroidism (Singh and Parshad 1978). This may be deduced from the finding that precocious gonadal development is induced in 8-9 week chickens fed propylthiouracil or methimazole from hatch to induce hypothyroidism (Singh and Parshad 1978).…”

Section: Mechanisms Mediating Inhibitory Inputs Into the Hypothalamicmentioning

confidence: 99%

“…The stimulatory effects of goitrogen treatment on gonadal development appears to be most effective during the juvenile growth period because if continued beyond 15 weeks, reproductive function is inhibited (Singh and Parshad 1978). The stimulatory effects of goitrogen treatment on gonadal development can not be mimicked by thyroidectomy which is not compatible with full gonadal function (Snedecor and Mellen 1965, P. J.…”

Section: Mechanisms Mediating Inhibitory Inputs Into the Hypothalamicmentioning

confidence: 99%

The Photoperiodic Responses of Juvenile Domestic Hens

Sharp¹

1992

Ornis Scandinavica

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. . Wiley and Nordic Society Oikos are collaborating with JSTOR to digitize, preserve and extend access to Ornis Scandinavica. Sharp, P. J. 1992. The photoperiodic responses of juvenile domestic hens. -Ornis Scand. 23: 411-415.Domestic hens become sexually mature between 18 and 26 weeks of age, soon after reaching adult body size. The precise age of sexual maturity depends on the lighting patterns during rearing. During the prolonged period of juvenile development, the components of the hypothalamic-pituitary gland-gonadal axis (HPGA) are functional. Long daylengths exert both stimulatory and inhibitory effects on the juvenile HPGA. As early as 3 weeks of age, transfer of chickens from short to long days stimulates LH release. Exposure of newly hatched chickens to long days for several weeks and subsequent transfer to short days, delays the onset of sexual maturation. This long day-induced inhibitory input to the HPGA is a form of juvenile photorefractoriness evolved in the ancestors of domestic chickens to prevent young breeding in the year in which they are hatched. Juvenile photorefractoriness may be related to high steroid 5[3 reductase activity in neuroendocrine tissues and could depend upon thyroid hormones and neural pathways from extra-hypothalamic sites.

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Precocious sexual maturity and enhanced egg production in chickens given goitrogen at an early age

Cited by 8 publications

References 5 publications

The Effect of Carbimazole on Growth and Sexual Maturity in the Pullet

The Effect of Carbimazole on Growth and Sexual Maturity in the Pullet

Plasma concentrations of Luteinising hormone, follicle stimulating hormone, androgen, growth hormone, Prolactin, Thyroxine and Triiodothyronine during growth and sexual development in the cockerel

The Photoperiodic Responses of Juvenile Domestic Hens

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