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Reproductive Performance And Serum Concentrations Of Progesterone Of Heat-Stressed Holstein Heifers Subjected To Timed Artificial Insemination And Progesterone Supplementation, Abelardo Correa Calderon, Juan Augusto Hernandez Rivera, Leonel Avendaño Reyes, Ulises Macias Cruz, Raul Diaz Molina, Francisco Daniel Alvarez Valenzuela, Arnoldo Gonzalez Reyna
Reproductive Performance And Serum Concentrations Of Progesterone Of Heat-Stressed Holstein Heifers Subjected To Timed Artificial Insemination And Progesterone Supplementation, Abelardo Correa Calderon, Juan Augusto Hernandez Rivera, Leonel Avendaño Reyes, Ulises Macias Cruz, Raul Diaz Molina, Francisco Daniel Alvarez Valenzuela, Arnoldo Gonzalez Reyna
Turkish Journal of Veterinary & Animal Sciences
Sixty-nine Holstein heifers were used to evaluate the effect of progesterone supplementation after timed artificial insemination (TAI) on conception rates of heifers under heat stress. Heifers were randomly assigned to 1 of 3 treatments: 1) control treatment (C), visual detection of estrus. Heifers detected in estrous were inseminated according to the AM-PM procedure (n = 23); 2) TAI (n = 24), using a CIDR device (insert containing progesterone) placed intravaginally on day -10 and removed on day -2 with PGF2α given on day -3. Heifers were given 0.5 mg of ECP at CIDR insertion and a second injection (0.5 mg …