G. G. Macedo
Federal University of Uberlandia
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Featured researches published by G. G. Macedo.
Theriogenology | 2013
M. F. Sá Filho; L. Penteado; G.R. Siqueira; J. G. Soares; M.F. Mendanha; G. G. Macedo; P. S. Baruselli
The present study evaluated the effect of the type of norgestomet ear implant (new vs. used) on the ovarian follicular response (experiment 1) and pregnancy per artificial insemination (AI) (P/AI; experiment 2) of beef heifers subjected to an estradiol plus progestin timed artificial insemination (TAI) program. In experiment 1, 57 cyclic beef heifers were randomly assigned to one of two groups according to the type (new or previously used for 9 days) of norgestomet ear (NORG) implant. At the time of NORG implant insertion, the heifers were treated with 2 mg of intramuscular estradiol benzoate. Eight days later, the NORG implants were removed, and the heifers received an intramuscular administration of 150 μg of d-cloprostenol, 300 IU of equine chorionic gonadotropin, and 0.5 mg of estradiol cypionate. The heifers had their ovaries scanned every 12 hours from the time of NORG implant removal to 96 hours after verifying the occurrence and timing of ovulation. No difference (P = 0.89) was observed in the ovulation rates between the two treatments (new = 80.0%; 24/30 vs. used = 81.5%; 22/27). However, the heifers treated with a used NORG implant had (P = 0.04) higher proportion (36.4%; 8/22) of early ovulation (between 36 and 48 hours after NORG implant removal) compared with the heifers treated with a new NORG implant (8.3%; 2/24). In experiment 2, at the beginning of the synchronization protocol, 416 beef heifers were randomly assigned into two groups, as described in the experiment 1. Two days after the NORG implant removal, the heifers were reassigned to be inseminated at 48 or 54 hours after NORG implant removal. There was an interaction (P = 0.03) between the type of NORG implant and the timing of TAI on P/AI. The timing of insemination only had an effect (P = 0.02) on the P/AI when the heifers were treated with a used NORG implant [(TAI 54 hours = 41.9% (44/105) vs. TAI 48 hours = 58.6% (58/99)]. In conclusion, beef heifers synchronized with a used NORG implant plus estradiol exhibited a higher proportion of earlier ovulations, and TAI in these heifers should be performed 48 hours after removal of used NORG implants.
Reproduction in Domestic Animals | 2014
E. O. S. Batista; G. G. Macedo; R.V. Sala; M. D. D. V. Ortolan; M. F. Sá Filho; T. A. Del Valle; Elmeson Ferreira de Jesus; R. N. V. R. Lopes; Francisco Palma Rennó; P. S. Baruselli
Animal reproduction | 2016
R. G. Rezende; B. G. de Freitas; R. D. Mingoti; M. H. A. Colli; M. F. Sá Filho; J.B.P. Carvalho; J. C. Lemos Motta; G. G. Macedo; L. M. Vieira; P. S. Baruselli
Animal reproduction | 2014
G. G. Macedo; N. A. T. Carvalho; J. G. Soares; Ricarda Maria dos Santos; José Octavio Jacomini; P. S. Baruselli
Theriogenology | 2018
G. G. Macedo; R. D. Mingoti; E. O. S. Batista; Bruno Moura Monteiro; L. M. Vieira; R.V. Barletta; M.C. Wiltbank; G.P. Nogueira; Francisco Palma Rennó; J.R. Maio; P. S. Baruselli
Semina-ciencias Agrarias | 2018
Mayara Mafra Soares; D. C. Antonino; Mayara Oliveira; Jairo Melo Júnior; Luciana Ribeiro Peixoto; Tatiane Silva Maia; Kele Amaral Alves; José Octavio Jacomini; Ricarda Maria dos Santos; G. G. Macedo
Semina-ciencias Agrarias | 2017
Cléber Cardeal; Luiz Romulo Alberton; André Giarola Boscarato; Mirelly Vitalina Rocha; Lucas Giovanni Lima Marchetti; G. G. Macedo; Emerson Luiz Botelho Lourenço; Leonardo Franco Martins
Revista Brasileira de Reprodução Animal | 2016
André Giarola Boscarato; Leonardo Franco Martins; Rogério Oliveira Pinho; Yamê Fabres Robaina Sancler da Silva; F.O. Papa; G. G. Macedo
Reproduction, Fertility and Development | 2016
G. G. Macedo; R. V. Sala; L. F. Martins; P. S. Baruselli
INVESTIGAÇÃO | 2016
Teresinha Inês de Assumpção; André Luiz Quagliatto Santos; G. G. Macedo; Luciana R Peixoto; A C. A. Zampini