Evaluation of follicular growth patterns by ultrasound combined with measurement of
circulating reproductive hormones has allowed designation of three functionally critical …

During the last decade, researchers have studied the differences in the reproductive
physiology between Bos taurus and Bos indicus breeds. This manuscript focuses on the …

Administration of gonadotropin-releasing hormone (GnRH) induces a surge of luteinizing
hormone and ovulation in a variety of species, including human beings. Our objectives were …

Ovulatory response to the first GnRH of Ovsynch is the critical determinant for successful
synchronization of ovulation in dairy cows. Our objective in this study was to develop a pre …

Previous research indicated that the size of the ovulatory follicle at the time of insemination
significantly influenced pregnancy rates and embryonic/fetal mortality after fixed-timed AI in …

Early estrus-synchronization protocols focused on regressing the corpus luteum (CL) with an
injection of PGF2α followed by detection of estrus or involved the use of exogenous …

Two experiments compared follicular and luteal development and circulating steroid
concentrations from induced luteolysis to ovulation in lactating Holstein cows (n= 27; …

Compared to Bos taurus breeds, Bos indicus breeds of cattle present several differences in
reproductive physiology. Follicular diameter at deviation and at the time of ovulatory …

Several studies using transrectal ovarian ultrasonic scanning in Bos taurus (B. taurus) cattle
and more recently in Bos indicus (B. Indicus) females evaluated the reproductive cycles of …

Two experiments evaluated the influence of follicular wave at artificial insemination (AI) on
fertility of dairy cows. In experiment 1, data from 5,607 lactating cows enrolled in estrous and …