Effect of ovariectomy on concentration of progesterone in blood plasma and urinary estrogen excretion rate in the pregnant bovine.
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TLDR
Levels as low as 10ng/ml in some cows were associated with maintenance of pregnancy, though all cows which maintained pregnancy 264 days or longer following ovariectomy from 200 to 237 days had abnormal parturition and retained fetal membranes.About:
This article is published in Journal of Dairy Science.The article was published on 1968-03-01 and is currently open access. It has received 33 citations till now. The article focuses on the topics: Blood plasma.read more
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Journal ArticleDOI
The potential steroid hormone contribution of farm animals to freshwaters, the United Kingdom as a case study.
TL;DR: This survey suggests that direct excretion of steroid hormones by animals into water courses, or discharges from farmyard drains, are likely to be more important sources of contamination rather than via normal agricultural scenarios.
Journal ArticleDOI
Effects of ovariectomy during pregnancy and of prematurely induced parturition on progesterone, estrogens, and calving traits.
TL;DR: Four of eight ovariectomized cows had dystocia, and all retained the fetal membranes as did the six peers induced to calve prematurely on day 268 of gestation or 42±2h after treatment with dexamethasone and estradiol-17 β .
Book ChapterDOI
Comparative Endocrinology of Gestation
I. John Davies,Kenneth J. Ryan +1 more
TL;DR: This chapter discusses the comparative endocrinology of gestation with a focus on the development of the postimplantation endocrine system, a central aspect of the evolution of viviparity.
Journal ArticleDOI
PGE1 or PGE2 not LH regulates secretion of progesterone in vitro by the 88-90 day ovine corpus luteum of pregnancy.
Yoshie S. Weems,Phillip J. Bridges,Y. Tanaka,R.G. Sasser,B.R. LeaMaster,D.L. Vincent,C.W. Weems +6 more
TL;DR: It is concluded that PGE1 or PGE2 but not LH regulates secretion of progesterone in vitro by 88-90 day ovine CL of pregnancy.
Journal ArticleDOI
Effects of 17beta-estradiol on cardiac apoptosis in ovariectomized rats.
Cher Ming Liou,Ai-Lun Yang,Chia-Hua Kuo,Hua Tin,Chih Yang Huang,Chih Yang Huang,Shin-Da Lee,Shin-Da Lee +7 more
TL;DR: Cardiac apoptosis was found in ovariectomized rats without ischemia and the protective effects of 17β‐estradiol (E2) on cardiac Fas‐dependent and mitochondria‐dependent apoptotic pathways after post‐menopause or bilateral oophorectomy in women was available.
References
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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
Book
BMD : biomedical computer programs
TL;DR: This book is very referred for you because it gives not only the experience but also lesson, it is about this book that will give wellness for all people from many societies.
Journal ArticleDOI
Effect of ovariectomy on pregnancy maintenance and parturition in dairy cows.
TL;DR: The corpus luteum of pregnancy appeared essential for maintaining pregnancy in the bovine prior to Days 165–180; thereafter, a viable fetus was sometimes maintained in the absence of the gland, but the corpus lutenum was essential during late pregnancy to prevent shortened gestations and abnormal parturitions.
Journal ArticleDOI
Control of ovulation in cattle with melengestrol acetate. I. Effect of dosage and route of administration.
R. G. Zimbelman,L. W. Smith +1 more
TL;DR: In this paper, the authors used progestagen to prevent oestrus and ovulation in dairy heifers with normal oestrous cycles for 15 to 18 days beginning at the 15th day of the cycle.
Related Papers (5)
Maintenance of Pregnancy in Ovariectomized Cattle with Progestin Compounds and Their Effect on Progestin Levels in the Corpus Luteum
K.R. Johnson,R.E. Erb +1 more