RESUMO
The objective of this study was to evaluate the association of IATF with FD on the reproductiveefficiency of Nellore cows. It was used 917 females submitted to estrus synchronization protocol, with P4 deviceplaced and applied 2mL BE in D0; In D9 removed the device, applied 2.5mL of PG, 0.3mL of CE and 300uI ofeCG. The inseminations made on D11, 48-54 hours after withdrawal from the device. Blood collections weremade on D0 and D11. G1 (n = 489) were formed, with synchronized females and, prior to insemination,measured FD, classified as large, medium or small; The G2 (n = 428), by females only synchronized andinseminated. Gestation rates in G1 and G2 were 46.01% and 41.12%, and did not differ between groups. In theG1, females with large and medium follicles rates did not differ, since females with small follicles had lowerrates. P4 in the D0 indicated 47.19% of females in the follicular phase and 46.67% in the progesterone phase;In D11, the means of P4, considered low, medium or high, had rates of 82.14, 57.14 and 8.57%, respectively. Itis concluded that females with small follicles or with P4 raised to insemination have low pregnancy rates.
Assuntos
Feminino , Animais , Bovinos , Bovinos/embriologia , Fase Folicular , Folículo Ovariano/anatomia & histologia , Progesterona/análise , Inseminação Artificial/veterináriaRESUMO
The objective of this study was to evaluate the association of IATF with FD on the reproductiveefficiency of Nellore cows. It was used 917 females submitted to estrus synchronization protocol, with P4 deviceplaced and applied 2mL BE in D0; In D9 removed the device, applied 2.5mL of PG, 0.3mL of CE and 300uI ofeCG. The inseminations made on D11, 48-54 hours after withdrawal from the device. Blood collections weremade on D0 and D11. G1 (n = 489) were formed, with synchronized females and, prior to insemination,measured FD, classified as large, medium or small; The G2 (n = 428), by females only synchronized andinseminated. Gestation rates in G1 and G2 were 46.01% and 41.12%, and did not differ between groups. In theG1, females with large and medium follicles rates did not differ, since females with small follicles had lowerrates. P4 in the D0 indicated 47.19% of females in the follicular phase and 46.67% in the progesterone phase;In D11, the means of P4, considered low, medium or high, had rates of 82.14, 57.14 and 8.57%, respectively. Itis concluded that females with small follicles or with P4 raised to insemination have low pregnancy rates.(AU)