02355naa a2200325 a 450000100080000000500110000800800410001910000210006024501130008126000090019450001280020352013040033165000210163565000110165665000170166765000170168465000110170165000170171265000230172965000180175265300280177065300140179870000230181270000210183570000180185670000190187470000230189370000230191677300900193920892522019-02-25       2018    bl uuuu     u00u1 u    #d1 aLOIOLA, M. V. G.  aOral progesterone supplementation for beef cattle after insemination in TAI programs.h[electronic resource]  c2018  aTítulo em português: Suplementação com progesterona oral para gado de corte após a inseminação em programas de IATF.  aThe objective of this work was to evaluate the effects of supplementation with melengestrol acetate (MGA), after timed artificial insemination (TAI), on the conception rate of Nellore cows, according to cyclicity during the protocol, estrus expression between intravaginal device withdrawal and insemination, and diameter of the largest follicle at the time of insemination, in order to identify predictors of the use of MGA. Multiparous lactating cows (577) were subjected to a hormonal protocol for ovulation synchronization. On day -2 of the protocol, the animals were painted with a marker on the base of their tail. On day 0, they were evaluated for estrus expression; the preovulatory follicle diameter (POFD) was measured by ultrasonography, and the artificial insemination was performed. The animals were assigned to two experimental groups according to the supplementation or not with 0.50 mg MGA, between 13 and 18 days after TAI. Pregnancy diagnosis was performed using an ultrasound examination 35 days after TAI. A positive effect of the treatment with MGA on the conception rate occurred generally in animals in anestrus, irrespective of the estrus expression. For animals treated with MGA, only those with POFD greater than 14 mm showed better conception rates that the control group.  aAnimal fertility  aCattle  aInsemination  aMelengestrol  aBovino  aCiclo estral  aFertilidade animal  aInseminação  aAcetato de melengestrol  aAnestrous1 aBITTENCOURT, R. F.1 aRODRIGUES, A. S.1 aFERRAZ, P. A.1 aLIMA, M. C. C.1 aCARVALHO, C. V. D.1 aFILHO, A. de L. R.  tPesquisa Agropecuária Brasileira, Brasília, DFgv. 53, n. 1, p. 105-112, jan. 2018.