Data/hora: 24/06/2024 13:46:03

Biblioteca(s): 	Embrapa Pantanal.	
Data corrente: 	11/11/2019	
Data da última atualização: 	06/01/2020	
Autoria: 	RODRIGUES, W. B.; JARA, J. do P.; SILVA, J. C. B.; OLIVEIRA, L. O. F. de; ABREU, U. G. P. de; ANACHE, N. A.; SILVA, K. C. da; BEZERRA, A. de O.; CARDOSO, C. J. T.; NOGUEIRA, E.	
Afiliação: 	WALVONVITIS BAES RODRIGUES, Fundacao de Apoio ao Desenvolvimento do Ensino Ciencia e Tecnologia do Estado de Mato Grosso do Sul; JEAN DO PRADO JARA, Uniderp Anhanguera; JULIANA CORREA BORGES SILVA, CPAP; LUIZ ORCIRIO FIALHO DE OLIVEIRA, CNPGC; URBANO GOMES PINTO DE ABREU, CPAP; NATALIA ALBANESE ANACHE, UFMS - Universidade Federal de Mato Grosso do Sul; KARINE CASANOVA DA SILVA, UFMS- Universidade Federal de Mato Grosso do Sul; ALEXANDRE DE OLIVEIRA BEZERRA, UFMS - Universidade Federal de Mato Grosso do Sul; CHRISTOPHER JUNIOR TAVARES CARDOSO, UFMS – Universidade Federal de Mato Grosso do Sul; ERIKLIS NOGUEIRA, CPAP.	
Título: 	Efficiency of mating, artificial insemination or resynchronisation at different times after first timed artificial insemination in postpartum Nellore cows to produce crossbred calves.	
Ano de publicação: 	2019	
Fonte/Imprenta: 	Animal Production Science, v. 59, n. 2, p. 225-231, 2019.	
DOI: 	https://doi.org/10.1071/AN17466	
Idioma: 	Inglês	
Conteúdo: 	The objective of this trial was to evaluate different post-timed artificial insemination (TAI) reproductive managements in postpartum beef cows to produce crossbred calves from artificial insemination (AI). Nellore cows (n = 607), with 45 days postpartum, were inseminated at a fixed time, using a protocol that included an intravaginal progesteronereleasing device along with oestradiol benzoate, prostaglandin, equine chorionic gonadotropin, and oestradiol cypionate, followed TAI 48 h post-device removal. Four post-TAI treatments were evaluated: in CONTROL (T1, n = 161), cows were exposed to Nellore clean-up bulls until the end of the breeding season (75 days). In OBSERVATION (T2, n = 132), heat detection was performed for 15?25 days post-TAI, followed by AI. In RESYNC22 (T3, n = 157) and RESYNC30 (T4, n = 157), resynchronisation started after 22 or 30 days, following second TAI at Day 32 or 40 days after first TAI. In T2, T3 and T4, after the second AI, cows were exposed to Nellore clean-up bulls until the end of the breeding season (75 days). The pregnancy rate (PR) for the first TAI did not differ (54.6%, 53.0%, 59.2%, and 51.6% for CONTROL, OBSERVATION, RESYNC 22, and RESYNC 30, respectively; P = 0.66), and no difference was observed for the second TAI (RESYNC 22 = 45.31% and RESYNC30 = 46.05%; P = 0.137), in the PR at the end of the breeding season (86.33%, 86.36%, 78.98%, and 81.52%, P = 0.43), or embryonic losses (4.54%, 2.85%, 6.45% and 7.40%, respectively; P = 0.61), but the percentage of crossbred pregnancy was higher in groups with resynchronisation (RESYNC22 and RESYNC30) than CONTROL and OBSERVATION (98.38%, 90.62%, 63.30%, 78.95%, P < 0.001). In conclusion, resynchronisation programs of 22 or 30 days are more efficient to produce AI products, and the final pregnancy rate is similar among the treatments, differing only in the amount of calves produced by AI.	
Thesagro: 	Gado Nelore; Inseminação Artificial; Reprodução Animal; Vaca.	
Thesaurus Nal: 	Animal reproduction; Artificial insemination; Cows.	
Categoria do assunto: 	L Ciência Animal e Produtos de Origem Animal	
Registro original: 	Embrapa Pantanal (CPAP)	
Exemplares: 	CPAP - (60453-1) - UPC - AP - DD -  -  -  - DIS