الفهرس | Only 14 pages are availabe for public view |
Abstract The objectives of this study were to investigate the effectiveness of PGF2α and GnRH injections at early lactation on placental drop, uterine involution, resumption of postpartum (pp) ovarian activity and subsequent reproductive performance parameters in dairy cows, also it aims to investigate the relationship between different blood metabolites and the resumption of pp ovarian cyclicity in cows. The study was conducted on 64 dairy cows in El-Salhya. Cows were randomly assigned into the following groups: (i) control group which were left without treatment. (ii) PGF2α treated group, where cows received PGF2α immediately after calving. (iii) GnRH treated group, each cow received GnRH analogue on 13-15 day pp. (iv) PGF2α plus GnRH treated group. The reproductive tract of the cows was examined twice weekly by rectal palpation and transrectal ultrasound scanning. Blood samples were obtained for progesterone and blood metabolites analysis. Administration of PGF2α and GnRH during the early pp period slightly improve the time required for placental drop, uterine involution |