Progesterone (P4) has a pivotal position on feminine puberty attainment in maximum cattle. Alternatively, there aren’t any research comparing the impact of P4 remedy in the past to boar publicity for puberty induction in gilts.
Strategies and effects: Serum P4 focus, estrus expression and reproductive efficiency after boar stimuli have been evaluated in gilts intramuscularly handled with long-acting P4 prior to boar publicity. In Experiment I, prepubertal gilts gained both 1 mL of saline (keep watch over) or intramuscular P4 remedy (150 mg, 300 mg or 600 mg; n = 6 in keeping with remedy). Serum P4 focus for P4-treated gilts used to be more than for keep watch over gilts for no less than 8 d for P4300 and P4600 teams, however higher till after 16 d just for the ones handled with 600 mg. In Experiments II (prepubertal) and III (peripubertal), gilts gained both saline (keep watch over) or 300 mg P4 intramuscular and the ones appearing estrus indicators have been artificially inseminated, while gilts with out estrus expression have been culled. In prepubertal gilts (Exp. II), estrus expression fee didn’t vary for keep watch over (79.1%; n = 110) and P4-treated gilts (81.5%; n = 108). In peripubertal gilts (Exp. III), despite the fact that estrus expression didn’t vary between keep watch over (77.6%; n = 106) and P4-treated (69.6%; n = 102) gilts, P4-treated gilts offered longer (23.1 ± 1.4 days) period from remedy to estrus expression than keep watch over gilts (17.1 ± 1.3 days). In Experiments II and III, the share of culled gilts with ovarian buildings in keeping with customary estrous cycles, farrowing fee, and muddle dimension didn’t vary between remedies.
Conclusion: Intramuscular remedy with 300 or 600 mg of long-acting P4 used to be environment friendly in keeping up top P4 concentrations in prepubertal gilts for no less than 8 days. Alternatively, P4 remedy over this time period didn’t receive advantages the reproductive efficiency of prepubertal and peripubertal gilts.
Baldessar P, de Brito CRC, Johann H, Schultz C, Peripolli V, Moreira F, Lucia T, Ulguim RR, Gasperin BG, Bianchi I,
Lengthy-acting injectable progesterone remedy previous to puberty induction in gilts. Home Animal Endocrinology. 2023; 84–85: 106807. https://doi.org/10.1016/j.domaniend.2023.106807.