Blood were collected daily from 16 Nelore heifers confined, for radioimmunoassay (RIA).analyses of progesterone The plasma progesterone assay were at day zero (estrus) and at each three days until the -1 and the day zero.again The animals were divided in two groups: 1) with regular estrous cycle of 21 days (heifers with two and three follicular growth waves) and 2) with prolonged estrous cycle, greater than 25 days (heifers with four follicular growth waves). The mean plasma progesterone level from […]

Six lactating goats were randomly assigned to a crossover experimental design in two groups, under thermoneutral and heat stress conditions. An adaptation period of 28 days were followed by 4-periods of 14 days each, when the animals under heat stress were exposed to an average temperature of 33.34oC; THI of 86.20; BGT of 36.18 and BT of 32.11oC from 8 to 17 hours, including simulated solar radiation from 10 to 15 hours. There was no difference for progesterone plasma concentrations […]