Data/hora: 22/09/2024 21:45:09

Biblioteca(s): 	Embrapa Acre.	
Data corrente: 	31/08/2020	
Data da última atualização: 	28/06/2021	
Autoria: 	ANDRADE, J. P. N.; GOMEZ-LÉON, V. E.; ANDRADE, F. S.; CARVALHO, B. P.; LACOUTH, K. L.; GARCIA, F. Z.; JACOB, J. C. F.; SALES, J. N. S.; WILTBANK, M. C.; MELLO, M. R. B.	
Afiliação: 	Joao P. N. Andrade, Universidade Federal Rural do Rio de Janeiro / University of Wisconsin-Madison; Victor E. Gomez-Leon, University of Wisconsin-Madison; Fabiana S. Andrade, Universidade Federal Rural do Rio de Janeiro / University of Wisconsin-Madison; BRUNO PENA CARVALHO, CPAF-AC; Karen L. Lacouth, Universidade Federal do Acre; Felipe Z. Garcia, Universidade Federal Rural do Rio de Janeiro; Júlio C. F. Jacob, Universidade Federal Rural do Rio de Janeiro; José N. S. Sales, Universidade Federal de Lavras; Milo C. Wiltbank, University of Wisconsin-Madison; Marco R.B. Mello, Universidade Federal Rural do Rio de Janeiro.	
Título: 	Development of a novel 21-day reinsemination program, ReBreed21, in Bos indicus heifers.	
Ano de publicação: 	2020	
Fonte/Imprenta: 	Theriogenology, v. 115, p. 125-131, Oct. 2020.	
ISSN: 	0093-691X	
DOI: 	https://doi.org/10.1016/j.theriogenology.2020.04.021	
Idioma: 	Inglês	
Conteúdo: 	The aim was to develop a program for resynchronization of ovulation (ReBreed21) that allowed reinsemination of non-pregnant Bos indicus heifers every 21 d using timed AI (TAI) without the need for detection of estrus. The Rebreed21 program begins 12 d after previous TAI (Day 0) by inserting an intravaginal P4 implant (Day 12) that is removed 7 d later (Day 19) combined with treatment with 300 IU of eCG. On Day 21, early pregnancy diagnosis (Doppler PD) is performed based on CL vascularity. Nonpregnant (NP) heifers immediately received AI combined with 100 mg of GnRH. The program is replicated 12 d after second TAI to produce a breeding season (BS) of 42 d with 3 potential TAIs. Two experiments were conducted as a proof of concept for this rapid rebreeding program. In Experiment 1, 76 heifers were enrolled in ReBreed21, as explained above. In Experiment 2, 300 Nellore heifers were synchronized for 1st TAI and randomly assigned to one of two groups: ReBreed21 (n = 147) or another early resynchronization procedure, Resynch14 (n = 153) with P4 implant inserted 14 d after previous TAI plus 50 mg of long-acting injectable P4; 8 d later P4 implant removed (Day 22) and early Doppler PD performed; NP heifers received 150 mg of cloprostenol, 0.5 mg of ECP, and 300 IU of eCG with TAI on Day 24. In both experiments, the largest follicle (LF) was measured at each Resynch TAI. Ultrasound was later used to confirm the early Doppler PD and to determine ovulation (OV) to Resynch at 12 d after TAI in ReBreed21 (Day 33 of pregnancy) and 14 d after TAI in Resynch14 (Day 38 of pregnancy). Final PD was performed 40 d after 3rd TAI. Results for Experiment 1 were: diameter of LF 11.8 ± 0.23 mm; 88.9% OV; 20.5% false positives; 38.1% P/AI at 1st TAI; 44.4% overall P/AI for ReBreed21 TAIs; 72.3% total pregnant at end of BS. In experiment 2, Rebreed21 vs. Resynch14 were different for: diameter of LF (10.9 ± 0.17 vs. 10.0 ± 0.17 mm, P = 0.0003), heifers with LF < 8.5 mm (10.2 vs. 26.4%, P = 0.04), or LF 11 mm (50.0 vs. 37.2%, P = 0.001), and P/AI at first TAI (29.3% [43/147] vs. 20.3% [31/153], P = 0.074) but similar for OV (overall 86.8% [239/275], P = 0.82), false positives (P = 0.52) overall P/AI for Resynch TAIs (33.6 vs. 28.8%, P = 0.4), and total pregnant at end of BS (58.5% [86/147] vs. 55.6% [85/153], P = 0.64). In addition, median time to pregnancy was 9 d earlier (P = 0.0007) for ReBreed21 than Resynch14. Thus, ReBreed21 is a novel protocol that allows earlier reinseminations than Resynch14 but with similar fertility.	
Palavras-Chave: 	Cruce de animales; Inseminación artificial; Métodos de mejoramiento genético; Ovulación; Razas zebú; ReBreed21; Ressincronização; Resynchronization; Vaquilla.	
Thesagro: 	Bos Indicus; Gado Nelore; Gado Zebu; Inseminação Artificial; Novilho; Ovulação; Reprodução Animal.	
Thesaurus Nal: 	Animal breeding; Artificial insemination; Breeding methods; Heifers; Nellore; Ovulation; Zebu breeds.	
Categoria do assunto: 	L Ciência Animal e Produtos de Origem Animal	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/215666/1/27022.pdf	
Registro original: 	Embrapa Acre (CPAF-AC)	
Exemplares: 	CPAF-AC - (27022-1) - UPC - AP - DD -  -  -  - DIS