Data/hora: 23/09/2024 10:10:24

Biblioteca(s): 	Embrapa Pantanal.	
Data corrente: 	24/08/1995	
Data da última atualização: 	16/07/2012	
Autoria: 	CLARK, K. W.; MOTT, G. O.	
Título: 	The dry matter digestion in vitro of forage crops.	
Ano de publicação: 	1960	
Fonte/Imprenta: 	Canadian Journal of Plant Science, v.40, n.1, p.123-129, Jan.1960.	
Idioma: 	Inglês	
Conteúdo: 	An artificial rumen technique was evaluated as a method of determining the dry matter digestion of forages. The digestibility estimates obtained in the spring were significantly correlated (r = 0.77xx) with estimates obtained on these forages from a conventional digestion trials, whereas in the fall the coefficients were low and longer significantly correlated ( r = 0.49) with the conventional trial data. A medium maturing timothy polycross nursey was harvested at 10-day intervals throughout the first growth cycle. With the exception of the April 14th stage there were no significant differences in digestibility between the clones harvested in the early-leaf stage. Significant differences between selections were  obtained in digestibility at later stages of maturity which may be a function of the leaf-stem ratio, the amount of leaf firing and thickness of the culms as well as changes in chemical composition. The per cent fructose content of this timothy herbage was significantly  correlated (r = 0.78xx) with the dry matter digestibility only at the first stage of cutting. Changes in dry matter digestion using this artificial rumen technique were observed, with
digestion estimates being higher during the spring and summer than during fall and winter. The method of drying herbage for these in vitro digestion experiments was studied with the conclusion that there was a significant difference in favour of freeze-drying. The dry matter digestion coefficients of the freeze-dried herbage were comparable to those expected for herbage of such qualitydigested in vivo. The use of an artificial rumen technique for estimating digestibility of clonal material shows promise for the plant breeder, providing certain precautions are taken. All lines to be screened should be included in a single trial to ensure maximum control of variables associated withtechnique. Samples should be uniformly processed, preferably freeze-dried, and digested with a single sample of rumen fluid.	
Palavras-Chave: 	Colheita de forragem; Dry matter; Pasture.	
Thesagro: 	Digestibilidade; Matéria Seca; Pastagem.	
Thesaurus Nal: 	digestibility; forage crops.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Pantanal (CPAP)	
Exemplares: 	CPAP - (29406-1) - ADD - SP - -- - SP1026 -  - 1026 - DIS