Recently, weak estrous behavior was assumed to be the cause of a decline in breeding efficiency in cattle. The present study investigated the effect of measuring the vaginal temperature on the detection of estrus in Japanese Black cows. First, the effect of hormone administration to cows with a functional corpus luteum on the vaginal temperature was evaluated by continuous measurement using a t...

AKDAG, F., O. CADIRCI and B. SIRIKEN, 2010. Effect of estrus on milk yield and composition in Jersey cows. Bulg. J. Agric. Sci., 16: 783-787 This study was performed to demonstrate the effect of estrus on milk yield and composition in Jersey. In this study, 15 jersey cows which were at the same estrus period, in the third lactation period and breeding under uniform housing and feeding condition...

The present study was undertaken to measure estrus response (%), interval to estrus (hr), duration of estrus and conception rate (%) after synchronization in Black Bengal does. Synchronization of estrus was done by intramuscular injection of synthetic PGF2α as dinoprost. Two trials were conducted with twenty cyclic fertile adult Black Bengal does. The age and body weight of the does were betwee...

1. Normal rabbits in the course of their development, after infancy, vary in their responses to minute doses of horse serum given intracutaneously. 2. There is increased reactivity in males as they mature, beginning, in the stock employed in these experiments, at about the age of 13 weeks when a weight of 1,700 gm. has been attained. 3. The reactivity of normal females remains at a constant lev...

Objective: The aim of this study was to ascertain the effects adding green tea extract (GTE) skim milk-egg yolk (SM-EY) extender on both quality post-thawed bull semen and pregnancy rates recipient cows.Methods: Twelve ejaculates from four Simmental bulls, aged 3 5 years weighing 900 950 kg, were diluted SM-EY extender, added with 0, 0.05, 0.1, 0.15 mg GTE/100 mL then frozen. After weeks storag...

Abstract Korean black goat (Capra hircus coreanae) populations are dwindling and facing genetic erosion due to artificial insemination. Here, we introduced an estrus synchronization method for goats enable crossbreeding with non-native breeds on small farms investigated the application of insemination in goats. Semen was obtained using electro-ejaculation preserved a conventional simple freezin...

From these observations there seemed to be little doubt that the follicular fluid of the ovary contains an active growth-stimulating substance and one capable of initiating an active digestion of a foreign fat, which might otherwise remain unabsorbed for an indefinite time in the tissues of these animals (2). We have not attempted to ascertain whether this substance exciting growth and a digest...

The present investigation was carried out to evaluate the effects of environmental factors on reproductive performance of bovine (Bos taurus) during summer, winter and spring for one year. The study was performed on free moving animals under natural condition during the two consecutive estrus periods by visual observation. The duration of estrus, numbers of mounts were observed. There was a sea...

The objectives of the present study were to determine if lameness, a model for a natural chronic stressor, affects hormone concentrations in milk prior to estrus and/or the subsequent expression of estrus in the postpartum period. Dairy cows>20 days postpartum were scored for lameness and observed for estrus intensity using a weighted scoring system (>100 points=estrus=Day 0). Increasing lamene...

An experiment was conducted to investigate the changes in peripheral plasma FSH concentrations in relation to expression of estrus in Sahiwal cows. Out of total five estrus, three were accompanied by overt signs whereas rest two were silent estrus. In cows with overt estrus, plasma FSH concentrations during periestrus, early luteal, midluteal and late luteal phase were 1.65+/-0.34, 1.67+/-0.21,...