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Dive into the research topics where G. G. Macedo is active.

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Featured researches published by G. G. Macedo.


Theriogenology | 2013

Timed artificial insemination should be performed early when used norgestomet ear implants are applied for synchronizing ovulation in beef heifers.

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

Plasma Antimullerian Hormone as a Predictor of Ovarian Antral Follicular Population in Bos indicus (Nelore) and Bos taurus (Holstein) Heifers

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

Follicular dynamics of Nelore cows submitted to resynchronization 14 days after TAI using injectable P4 for synchronization of follicular wave

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

Kisspeptin stimulates LH release in buffalo cows in the breeding and nonbreeding season

G. G. Macedo; N. A. T. Carvalho; J. G. Soares; Ricarda Maria dos Santos; José Octavio Jacomini; P. S. Baruselli


Theriogenology | 2018

Profile of LH release in response to intramuscular treatment with kisspeptin in Bos indicus and Bos taurus prepubertal heifers

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

The role of Kisspeptin in bovine in vitro embryo production

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

Comparative study between the hemocytometric and spectrophotometric methods for measuring the sperm concentration of young Nelore bulls

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

Efeito da adição de ciclodextrina carregada com colesterol sobre a qualidade do sêmen congelado/descongelado de touros adultos da raça Nelore

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

7 KISSPEPTIN SLOWLY ADMINISTERED DURING PROESTRUS IMPROVES FOLLICLE GROWTH AND OVULATION IN ANESTROUS COWS

G. G. Macedo; R. V. Sala; L. F. Martins; P. S. Baruselli


INVESTIGAÇÃO | 2016

COLETA E AVALIAÇÃO MORFOLÓGICA DOS ESPERMATOZOIDES EPIDIDIMÁRIOS DE VEADO-CATINGUEIRO Mazama gouazoubira FISCHER, 1814

Teresinha Inês de Assumpção; André Luiz Quagliatto Santos; G. G. Macedo; Luciana R Peixoto; A C. A. Zampini

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Rogério Oliveira Pinho

Universidade Federal de Viçosa

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José Octavio Jacomini

Federal University of Uberlandia

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Mayara Oliveira

Federal University of Uberlandia

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Ricarda Maria dos Santos

Federal University of Uberlandia

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J. G. Soares

University of São Paulo

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