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Featured researches published by T. C. Byerly.


Experimental Biology and Medicine | 1936

Studies of Prolactin in the Fowl Pituitary. I. Broody Hens Compared With Laying Hens and Males

William Burrows; T. C. Byerly

Conclusions It has been found that single fowl pituitaries implanted over the crop glands of 8- to 10-weeks-old pigeons (age computed from time of conception) will, in many instances, cause a prolactin-like reaction. It is assumed that this reaction is caused by prolactin in the pituitaries of the donating fowls. Pituitaries from broody hens cause a greater reaction of the pigeon crop gland than the pituitaries of laying hens. Pituitaries from males cause a reaction about equal to, or slightly less, than the pituitaries from laying hens. It was noted in a few cases that the pituitaries of hens just becoming broody gave a greater reaction than those of hens nearly over their broody period. More data are being gathered on this point.


Experimental Biology and Medicine | 1935

A new nutritional disease of the chick embryo.

T. C. Byerly; Harry W. Titus; N. R. Ellis; W. Landauer

Summary and Conclusions Abnormal embryos and chicks, with relatively short bones, were frequently produced in eggs laid by birds which received diets lacking in some factor or factors present in wheat germ, liver, and whey. The activity, amount or utilization of this factor or these factors was augmented by permitting the birds access to direct sunlight and green range.


Experimental Biology and Medicine | 1936

Sensitivity of the Baby-Chick Comb to Male Sex Hormone.∗:

William H. Burrows; T. C. Byerly; Everett I. Evans

Of the various existing tests for the male sex hormone, that of the capon comb is generally recognized as being the most satisfactory. The cost of capons and their upkeep is a hindrance to wide use of this test. If baby chicks can be utilized to test for male hormone properties, the cost of such tests will be materially reduced. The purpose of this investigation was to determine whether the comb of the baby chick is sufficiently sensitive to the action of male sex hormone to warrant the more extensive experiments necessary to establish that the baby chick may be used as a test object. † As a preliminary experiment 3 groups of day-old, Single-comb White Leghorn chicks (7 chicks to the group) were injected subcutaneously with the male hormone product testosterone. A fourth group of 7 chicks was carried as controls. Group 1 received 25 gamma daily, and group 3 received 100 gamma. After 4 injections, 2 chicks of Group 1, 5 chicks of Group 2 and all those in Group 3 showed a definite increase in comb growth. Injections were continued on 3 chicks selected from Group 3. After 14 daily (except Sunday) injections these 3 chicks were photographed with their controls. Fig. 1 shows one of these chicks with its control. In a second series of experiments, 117 other chicks were injected, some with testosterone and some with androsterone. Single-comb White Leghorns and Rhode Island Reds of both sexes were used. Their ages varied from 1 to 10 days of age, and injections of various amounts of material were made either in the base of the comb or in the breast muscle. Table I shows the results obtained.


Poultry Science | 1938

The Effect of Certain Groups of Environmental Factors upon the Expression of Broodiness

William H. Burrows; T. C. Byerly


Journal of Morphology | 1930

The effects of breed on the growth of the chick embryo

T. C. Byerly


Journal of Experimental Zoology | 1938

Growth in weight and cell number. Genetic effects in the chick embryo and chick

T. C. Byerly; W. G. Helsel; J. P. Quinn


Poultry Science | 1936

Multiple Turning and Orienting Eggs During Incubation as They Affect Hatchability

M. W. Olsen; T. C. Byerly


Poultry Science | 1938

Effect of Different Incubation Temperatures on Mortality of Chick Embryos

T. C. Byerly


Poultry Science | 1937

Egg Turning, Pipping Position and Malpositions

T. C. Byerly; M. W. Olsen


Poultry Science | 1935

Sex Ratio and Embryonic Mortality in the Domestic Fowl

T. C. Byerly; Morley A. Jull

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Harry W. Titus

United States Department of Agriculture

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N. R. Ellis

United States Department of Agriculture

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M. W. Olsen

United States Department of Agriculture

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Morley A. Jull

United States Department of Agriculture

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C. W. Knox

United States Department of Agriculture

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Ralph B. Nestler

United States Department of Agriculture

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Joseph P. Quinn

United States Department of Agriculture

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S. J. Marsden

United States Department of Agriculture

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S. K. Haynes

United States Department of Agriculture

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W. H. Burrows

Bureau of Animal Industry

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