Data/hora: 13/06/2024 00:04:06

Biblioteca(s): 	Embrapa Gado de Leite.	
Data corrente: 	31/10/2023	
Data da última atualização: 	31/10/2023	
Autoria: 	DIAS, H. R. S.; CAMARGO, A. J. dos R.; OLIVEIRA, G. F.; MOURÃO, A. M.; SARAIVA, N. Z.; CAMARGO, L. S. de A.; MULLER, M. D.; MARTINS, C. E.; NOGUEIRA, L. A. G.; BRANDÃO, F. Z.; OLIVEIRA, C. S.	
Afiliação: 	HUGO ROCHA SABENÇA DIAS, UNIVERSIDADE FEDERAL FLUMINENSE; AGOSTINHO JORGE DOS REIS CAMARGO; GABRIELA FERREIRA OLIVEIRA, UNIVERSIDADE FEDERAL RURAL DO RIO DE JANEIRO; ANDERSON MOREIRA MOURÃO; NAIARA ZOCCAL SARAIVA, CNPGL; LUIZ SERGIO DE ALMEIDA CAMARGO, CNPGL; MARCELO DIAS MULLER, CNPGL; CARLOS EUGENIO MARTINS, CNPGL; LUIZ ALTAMIRO GARCIA NOGUEIRA, UNIVERSIDADE FEDERAL FLUMINENSE; FELIPE ZANDONADI BRANDÃO, UNIVERSIDADE FEDERAL FLUMINENSE; CLARA SLADE OLIVEIRA, CNPGL.	
Título: 	Reproductive development of dairy heifers in an integrated livestock-forest system during the summer.	
Ano de publicação: 	2023	
Fonte/Imprenta: 	Animal Reproduction, v. 20, n. 3, e20230100, 2023.	
DOI: 	https://doi.org/10.1590/1984-3143-AR2023-0100	
Idioma: 	Inglês	
Conteúdo: 	This study aimed to assess the cortisol, body and reproductive development of prepubertal Holstein and Holstein-Gir ¾ heifers at 27 months of age maintained in an integrated livestock-forest (ILF) system for 60 summer days compared to the monoculture system in full sun (FS). The ILF system promoted changes (P=0.02) in the cortisol levels of Holstein-Gir ¾ heifers and did not affect weight gain in any of the breed groups studied. Animals in ILF system presented a lower (P=0.006) vulvar development for the rima height parameter and similar for the vulva width parameter. The ovarian follicular population of Holstein-Gir ¾ heifers in the ILF system was lower (P=0.004); however, for the Holstein heifers, no statistical difference was found, and numbers were higher (P=0.08) in the ILF system. None of the other ovarian parameters studied had any changes, and we also found important racial differences. Weight gain (P=0.003), vulvar development (P<0.001), and mean follicular size (P=0.008) were higher in the Holstein-Gir ¾ animals. Based on such results, the effect of the ILF system at 27 months of age on stress and reproductive parameters in the Holstein breed is considered positive, although negative effects have been detected on reproductive parameters in the Holstein-Gir ¾ breed.	
Palavras-Chave: 	Desenvolvimento reprodutivo; Estresse térmico; Integração pecuaria-floresta; Sistema integrado.	
Thesagro: 	Bem-Estar; Bovino; Gado Leiteiro; Reprodução Animal.	
Categoria do assunto: 	L Ciência Animal e Produtos de Origem Animal	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1157603/1/Reproductive-development-of-dairy-heifers-in-an-integrated-livestock-forest-system-during-the-summer.pdf	
Registro original: 	Embrapa Gado de Leite (CNPGL)	
Exemplares: 	CNPGL - (26139-1) - UPC - AP - DD -  -  -  - DIS