Monitoring and Comparing Follicular and Luteal Function Between Genetically High- and Low-Producing Dairy Cows by Ultrasonography

Authors : Şükrü Metin PANCARCI

Pages : 141-148

View : 8 | Download : 5

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The objectives of this study were to investigate the effectiveness of ultrasonography in monitoring ovarian activity by examining follicular growth and regression and studying the correlation between corpus luteum insert ignore into journalissuearticles values(CL); measurements and plasma progesterone insert ignore into journalissuearticles values(P4); concentrations, and to compare high-and low-production genetic lines of dairy cows regarding endogenous bovine somatotropin insert ignore into journalissuearticles values(bST); and milk production effects on follicular wave patterns, size and number of follicles, CL growth and plasma P4 concentrations during the estrous cycle monitored by ultrasound. Seventeen multiparous lactating Holstein cows were divided into two groups, a low-production group insert ignore into journalissuearticles values(control group, n=9); and a high-production group insert ignore into journalissuearticles values(select group, n=8);. Ovaries were examined daily from the day after estrus until the subsequent estrus by ultrasonography to monitor follicular and luteal dynamics. Nine of the 17 estrous cycles investigated in this trial had two follicular waves with an estrous cycle length of 22.2±0.4 days with a ovulatory insert ignore into journalissuearticles values(Graafian); follicle insert ignore into journalissuearticles values(18.1±0.4 mm);, while 8 cycles had three follicular waves with an estrous cycle length of with a ovulatory insert ignore into journalissuearticles values(Graafian); follicle insert ignore into journalissuearticles values(18.1±0.4 mm);, while 8 cycles had three follicular waves with an estrous cycle length of 24.5±0.7 days with a Graafian follicle insert ignore into journalissuearticles values(16.0±0.9 mm);. The average length of the 2-wave estrous cycle was significantly shorter insert ignore into journalissuearticles values(P
Keywords : Cow, Follicle, Corpus luteum, Progesterone, Bovine somatotropin, Ultrasonography, Reproduction, Milk Production