Pregnancy index of cows using progesterone after fixed-time artificial insemination
Rafaela T. Benedito Alves, Rodrigo Gonçalves Mateus, Danaila Bruneli Fernandes Gama, Lucas Gomes da Silva, João Victor de Souza Martins, Rafael Oliveira Lima, Ester Lays Martins Ribeiro, Luiz Carlos Pereira
Journal Title:Revista Agraria Academica / Agrarian Academic Journal
The objective was to evaluate the pregnancy rate using progesterone (P4) after 4 days of the FTAI. A total of 126 multiparous cows were used. The experimental design was completely randomized, with two treatments (T1 and T2), being: T1 -Control and T2 -P4 injectable D14. The cows were submitted to the same hormonal protocol of 3 treatments until the day of the FTAI, differentiating only in the D14. After 40 days of FTAI, the following pregnancy rates were obtained: T1-55.6% and T2-49.20%. It is concluded that the use of progesterone after 4 days of AI does not show differences of conception rate in relation to the control group and its use reduces the profitability of the productive system.