%0 Journal Article
%T EFEITO DO PER¨ªODO P¨®S-PARTO SOBRE A TAXA DE PRENHEZ DE VACAS DE CORTE SUBMETIDAS ¨¤ IATF (INSEMINA  O ARTICIAL EM TEMPO FIXO)
%A Ana Paula da Silveira
%A Marcelo Zoccolaro Costa
%A Luiz Roberto Almeida Gabriel Filho
%A Cali¨º Castilho
%J Colloquium Agrariae
%D 2010
%I University of Western Sao Paulo, UNOESTE
%R 10.5747/ca.2010.v06.n2.a057
%X This work aimed to evaluate the influence of postpartum period (precocious - of 28 to 44 days and late - of 45 to 90 days) on the bovine pregnancy rate using fixed-time AI. For that, 678 cows were divided in two groups: precocious group (G-P, n=151) and late group (G-T, n=527). The animals received CIDR  + 2 mL of estradiol benzoate (BE) in the day zero (D0). After eight days (D8) the dispositive was removed and both groups received 2.5mL PGF2¦Á, concurrent with PGF2¦Á injection, they received either 1.5mL of eCG or temporary calf removal (RTB). In the next day (D9), the cows received 1 mL de BE and 24 hours later, the fixed-time AI was performed with Nelore bovine semen. The calves were returned to their mothers. The pregnancy rate was not different between the groups (p>0.05), G-P=40% and G-T=48%. The results indicate that females with less than 45 days of postpartum are able to hormone protocol of fixed-time IA.
%K eCG
%K Zebu cattle
%K Temporary calf removal
%U dx.doi.org/10.5747/ca.2010.v06.n2.a057