Journal ArticleDOI
Effects of gonadal hormones on the blood composition of white-crowned sparrows.
Michael D. Kern,Michael D. Kern,Michael D. Kern,William A. De Graw,William A. De Graw,William A. De Graw,James R. King,James R. King,James R. King +8 more
TLDR
Serial changes in hematocrit and plasma calcium and cholesterol in response to progesterone, testosterone, and estradiol are described in female white-crowned sparrows.About:
This article is published in General and Comparative Endocrinology.The article was published on 1972-02-01. It has received 52 citations till now. The article focuses on the topics: Hematocrit & Testosterone.read more
Citations
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Journal ArticleDOI
Endocrine Responses of White-Crowned Sparrows to Environmental Stress
TL;DR: The effects of selected assumed stressors on the plasma concentrations of corticosterone, luteinizing hormone, and sex steroid hormones in White-crowned Sparrows (Zonotrichia leucophrys) were assessed.
Journal ArticleDOI
The endocrinology of a natural breeding population of the white-crowned sparrow (zonotrichia leucophrys pugetensis)
TL;DR: The levels of immunoreactive luteinizing hormone (irLH), testosterone, dihydrotestosterone (DHT), estradiol, estrone, and corticosterone have been measured through the course of the breeding season in the plasma of both sexes from a breeding population of white-crowned sparrows on Camano Island, Washington.
Journal ArticleDOI
Mechanisms Underlying the Costs of Egg Production
TL;DR: It is argued that hormonally mediated, non-resource-based costs of egg production caused by pleiotropic effects of reproductive hormones that can operate over the longer time scales at which costs of reproduction are expressed.
Book ChapterDOI
Endocrine Mechanisms of Migration
TL;DR: Migration involves complex interrelationships of anabolic and catabolic metabolism, behavior, and reproductive development and it is likely that some of the regulatory mechanisms of migration will be similar in spring and autumn and others different.
References
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Journal ArticleDOI
Extension of multiple range tests to group means with unequal numbers of replications
Abstract: In many fields of research, one is faced with the task of comparing the effects of treatments which have been replicated unequally. This happens for a number of reasons. In an experiment on animals, some may get sick and have to be removed from the experiment. In some experiments, the amount of material available for certain treatments may not be as much as for other treatments. If the experimenter has specified orthogonal contrasts that he is interested in before he runs the experiment, one can test the various treatment effects by an F-test after the treatment sum of squares has been partitioned into individual degrees of freedom for each orthogonal contrast. If the experimenter has not specified orthogonal contrasts, one is faced with the problem of deciding which treatments are significantly different. Several writers, including Duncan, Keuls, Newman, and Tukey, have developed multiple range tests to show differences among treatments that have been replicated the same number of times and when nothing was specified concerning the treatments. Duncan [1] compares the above methods and gives citations. This extension to unequal numbers of replications will be exemplified with reference to Duncan's "New Multiple Range Test," but is applicable to any of the above writers' tests; all one has to do is use their tabled ranges. In Duncan's test for an equal number of replications, the difference between any two ranked means is significant if the difference exceeds a shortest significant range. This shortest significant range is designated by R, and is obtained by multiplying the standard error of a mean, s,, by a given value, zn2, obtained from a table of significant studentized ranges which Duncan has tabled for both the 5% and 1% test. In Duncan's terminology, n2 is the degrees of freedom of the error mean square and p = 1, 2, * *, t is the number of means concerned. Consider an experiment with five treatments, A, B. C, D, and E, each replicated n times. Suppose on ranking the means from low to high one obtains
Journal ArticleDOI
A new color reaction for the quantitation of serum cholesterol.
TL;DR: The serum total and free cholesterol levels of 200 blood donors measured with the new color reaction were found to agree well with normal values reported by others and validates its use for either clinical or research purposes.
Journal ArticleDOI
Calcium metabolism and avian reproduction
TL;DR: The reproductive cycle and factors influencing the hypercalcaemia of the blood during reproduction are considered as well as the transport of calcium and other factors.
Journal ArticleDOI
Annual Gonadal Cycles and Pituitary Gonadotropins in Zonotrichia leucophrys gambelii
TL;DR: The annual cycle of pituitary gonadotropic potency in relation to gonadal cycles in free populations of the White-crowned Sparrow, Zonotrichia leucophrys gambelii Nuttall, and the annual ovarian cycle is investigated.
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