Data/hora: 18/06/2024 15:03:27

Biblioteca(s): 	Embrapa Agrobiologia.	
Data corrente: 	18/05/2023	
Data da última atualização: 	18/05/2023	
Autoria: 	OLIVEIRA, J. dos S.; DEPABLOS, L.; HOMEM, B. G. C.; FERREIRA, I. M.; BODDEY, R. M.; PAIVA, A. J.; LARA, M. A. S.; CASAGRANDE, D. R.	
Afiliação: 	JACQUELINE DOS SANTOS OLIVEIRA, UFLA; LUIS DEPABLOS, UFLA; BRUNO GROSSI COSTA HOMEM, BOLSISTA EMBRAPA AGROBIOLOGIA; IGOR MACHADO FERREIRA, UFLA; ROBERT MICHAEL BODDEY, CNPAB; ADENILSON JOSÉ PAIVA, UFRRJ; MÁRCIO ANDRÉ STEFANELLI LARA, UFLA; DANIEL RUME CASAGRANDE, UFLA.	
Título: 	Forage intake and nitrogen metabolism of beef cattle grazing palisadegrass-calopo mixed pasture managed using canopy light interception.	
Ano de publicação: 	2023	
Fonte/Imprenta: 	Grasse and Forage Science, First published: 01 May 2023.	
ISSN: 	1365-2494	
DOI: 	10.1111/gfs.12613	
Idioma: 	Inglês	
Conteúdo: 	To define the best grazing management strategy, it is important to assess animals' responses to variations in the structure and composition of tropical forages. This 2-year study evaluated animal response to Marandu palisadegrass (Urochloa brizantha)-calopo (Calopogonium mucunoides) mixed pastures managed under rotational grazing. Treatments consisted of three defoliation frequencies defined by rest periods interrupted at 90% (90LI), 95% (95LI) and 100% (100LI) of photosynthetically active radiation interception (LI). The stubble post-grazing height target was 15 cm. Statistical difference was declared at p < .10. The 100LI had lowest crude protein (CP) and in vitro dry matter digestibility (IVDDM) for the Marandu palisadegrass (p = <.001 both) and calopo (p = .003 and p = .067, respectively). Also, the OM digestibility decreased 7.0% in the 100LI condition than 90LI and 95LI treatment (p = .005). There was no difference in forage, grass, and legume intakes between the treatments (p > .10). The 100LI treatment decreased CP intake from grass in 33.3% (p = <.001) compared to other treatments. Greatest production of microbial N (p = .093) occurred with the 90LI treatment. The CP/digestible organic matter (DOM) ratio, urinary N excretion and retained N were lowest in the 100LI treatment (p = <.001, p = .007 and p = .014, respectively). The recommendation for grazing between 90 and 95% of LI is recommended because of greater CP intake and N utilization for the animals and improved the nutritive value of Marandu palisadegrass and calopo mixed pastures.	
Palavras-Chave: 	Forage intake; Warm season legume.	
Thesaurus Nal: 	Grazing management.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
Registro original: 	Embrapa Agrobiologia (CNPAB)	
Exemplares: 	CNPAB - (42154-1) - UPC - AP - DD -  -  -  - DIS