Data/hora: 23/09/2024 04:56:25

Biblioteca(s): 	Embrapa Rondônia.	
Data corrente: 	18/09/2018	
Data da última atualização: 	18/09/2018	
Autoria: 	PFEIFER, L. F. M.; MAPLETOFT, R. J.; DARDAWAL, D.; SINGH, J.	
Afiliação: 	LUIZ FRANCISCO MACHADO PFEIFER, CPAF-RO; Reuben John Mapletoft, University of Saskatchewan; Dinesh Dardawal, University of Saskatchewan; Jaswant Singh, University of Saskatchewan.	
Título: 	Effect of injectable progesterone on follicular development in lactating beef cows treated with estradiol plus a low-concentration progesterone device.	
Ano de publicação: 	2018	
Fonte/Imprenta: 	Brazilian Journal of Veterinary Research and Animal Science, v. 25, n. 2, p. 1-8, 2018.	
DOI: 	10.11606/issn.1678-4456.bjvras.2018.136924	
Idioma: 	Inglês	
Conteúdo: 	The effect of injectable progesterone was evaluated along with estradiol benzoate (EB) on the fate of the dominant follicle (DF) present in the ovary at the beginning of low progesterone-based TAI protocol. All cattle were given 500 µg cloprostenol im (PGF; Schering-Plough Animal Health for Estrumate, Pointe-Claire, QC, Canada) twice, 11 d apart, and allocated into two groups: Estradiol group (E group, n = 11) and Estradiol-Progesterone group (EP group, n = 11). Ten days after the second PGF (Day 0), all cattle were given an intravaginal progesterone device with half progesterone concentration (Cue-Mate with a single pod containing 0.78 g progesterone). Concurrently, all cattle were given 1.5 mg im of estradiol benzoate in 3 mL of canola oil and PGF im on Day 0 of the protocol in a crossover design, in which each cow received both treatments. Cows in the EP group also received 100 mg im progesterone (Sigma) in 2 mL of canola oil. On Day 8, progesterone devices were removed and all cattle were given PGF im. All statistical analyses were performed with SAS 9.0. The DF present on Day 0 ovulated in 76% (16/21) of cows from E group and 28.6% (6/21) of cows from EP group (P = 0.002). After progesterone device removal, the size of ovulatory follicle did not differ between groups (E group, 15.5 ± 0.43 mm vs EP group, 15.8 ± 0.98 mm; P = 0.82). These follicles ovulated in 81.3 ± 3.1 h in E group and 71.0 ± 6.1 h in EP group (P = 0.13). In conclusion, injectable progesterone reduced the proportion of cows that ovulate the dominant follicle present in the ovary at the beginning of estradiol-progesterone-based protocols. However, no difference was detected on time of ovulation after progesterone device removal between groups.	
Palavras-Chave: 	Dominant follicle; Folículo dominante.	
Thesagro: 	Gado de Corte; Ovulação; Rebanho.	
Thesaurus Nal: 	Beef cattle; Livestock.	
Categoria do assunto: 	L Ciência Animal e Produtos de Origem Animal	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/183194/1/BJVRAS-injectable-P4.pdf	
Registro original: 	Embrapa Rondônia (CPAF-RO)	
Exemplares: 	CPAF-RO - (18113-1) - UPC - AP - DD -  -  -  - DIS