Differential Effect of Some Gonadotropic Substances on Development of Cyclical Sex Characters in the English Sparrow.

Witschi, Emil; Keck, Warren N.

doi:10.3181/00379727-32-7780c

Cited by 14 publications

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“…Almost all deal with hormones of pituitary origin.'' An interesting as-* Later reports also support the conclusion that prolan has no significant effect on the gonads of birds (Hill and ; Witschi and Keck, 1935; Uhl and others, 1937). Breneman's results (1936) apparently were inconclusive.…”

Section: The Biology Of the Gonadotropic Hormones In Vertebratesmentioning

confidence: 77%

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The Physiology and Pharmacology of the Pituitary Body.

1937

Arch Intern Med

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The Pituitary Body in Relation to the Regulation of the Distribution OF Pigment IN Chromatophores . . . 244 IX. New Observations on the Chemistry and Pharmacology OF Extracts of the Pars Neuralis 258 X. The Pars Neuralis as a Gland of Internal Secretion . 274 Appendix. The Structural Formulas and Principal Actions OF Hormones of Natural Origin Bibliography Index 51955 ' Whether or not a pars intermedia can be identified in the bird's pituitary is still undecided (see the discussion of Wislocki and Gelling).f 10]''' Testosterone or androstenedione can cause ovulation by acting on the excised ovary of the toad, X. laevis .

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Section: The Biology Of the Gonadotropic Hormones In Vertebratesmentioning

confidence: 77%

“…The administration of testicular hormone, but not of oestrone, caused growth of the atrophied comb. Witschi and Keck (1935) the ovary might atrophy to the size of that of an immature bird 2-3 months old. [55] the color of the bill and the size of the oviduct, were observed (see Figs.…”

Section: The Biology Of the Gonadotropic Hormones In Vertebratesmentioning

confidence: 99%

The Physiology and Pharmacology of the Pituitary Body.

1937

Arch Intern Med

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“…Certainly U.P. appears to have proved inactive in all previous tests on birds [Allen, 1939[Allen, , p. 1027, but Witschi and Keck [1935] found Hill's extract of Horse Pituitary very effective in stimulating the quiescent ovary of the sparrow. Unfortunately, as these authors measure their doses in rat units, this does not allow of comparison with ours.…”

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Some Effects of Thyroid and Gonadotrophic Preparations in the Fowl

Greenwood

Blyth

1942

Exp Physiol

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WITsCHI [1935] has shown that certain pituitary and allied preparations can induce maturation and even full activity in the resting gonads of sparrows and finches. But while hormonal control appears to be involved in the non-breeding season, as it is in the cestrous cycle of mammals and the brooding cycle of birds, there is general agreement that the initiation and termination of the quiescent period are also related to certain external stimuli such as light variations. The researches of Bissonnette and Benoit indicate that these external agents require the intermediation of the anterior pituitary in order to exert their effect [reviewed by Marshall, 1936; Van Dyke, 1939, p. 58].As a rule, the annual autumnal cessation of egg production in the fowl coincides with the onset of the moulting period, and it might be assumed that the two processes are mutually incompatible, or too expensive physiologically to be carried on together. These views are supported by evidence from an inbred line, maintained at this Institute, in which a number of females have occurred which laid for two consecutive years without a break; such birds either did not moult, or replaced only a small percentage of their feathers while laying at a reduced rate.Nevertheless, the length of the infecund period varies greatly in individuals, and often far exceeds the time required for the completion of feather replacement. In a group of 58 hens, drawn from hatches in three successive years, the length of the gap at the end of the first laying year was 84-8 days, with a standard deviation of 34-56 days. The gap also lengthens with age: for the same 58 birds the mean difference between the dates of renewal of production in the second and third years is 2029 days (S.E., 3.89), and between the second and fourth years 29-74 days (S.E., 4 03). Greenwood et al. [1940] showed that although individual birds appeared to have a genetically determined date on which production ended, second-year birds tended to cease laying slightly earlier than pullets. In the same communication it was also pointed out that the range of dates on which birds cease to 175

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The relation of sex hormones to pigmentation and to testis descent in the opossum and ground squirrel

Finkel

1945

Am. J. Anat.

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Differential Effect of Some Gonadotropic Substances on Development of Cyclical Sex Characters in the English Sparrow.

Cited by 14 publications

References 0 publications

The Physiology and Pharmacology of the Pituitary Body.

The Physiology and Pharmacology of the Pituitary Body.

Some Effects of Thyroid and Gonadotrophic Preparations in the Fowl

The relation of sex hormones to pigmentation and to testis descent in the opossum and ground squirrel

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