Reproductive Steroids in the Bovine. VI. Changes and Interrelationships from 0 to 260 Days of Pregnancy

Publisher Website
Google Scholar
Abstract
IN equations for predicting levels of plasma progesterone, partial regressions for estradiol-17β were significant during the first 42 days of pregnancy (Randel et al., 1971c) and during days 1 to 19 of the estrous cycle of cows (Garverick et al., 1971). The latter authors also reported a significant negative partial regression for estradiol-17β in an equation for predicting plasma corticosterone. Also, plasma progesterone and LH were negatively and significantly correlated during the luteolytic phase of the estrous cycle in cows (Garverick et al., 1971) and from 0 to 12 days after estrus in pregnant and nonpregnant sows (Tillson, Erb and Niswender, 1970). Rates of excretion of estrone and metabolites of progesterone in urine were positively and significantly correlated at 19, 26, 68, 75, 82 and 110 days of pregnancy in the sow (Edgerton and Erb, 1971a). During the last 2 weeks of pregnancy in the cow (Hunter et al., 1970) and sow (Edgerton and Erb, 1971b) ratios of progesterone to estrogen decreased rapidly. Copyright © 1971. American Society of Animal Science . Copyright 1971 by American Society of Animal Science.

This publication has 0 references indexed in Scilit: