Data/hora: 27/05/2024 02:23:42

Biblioteca(s): | Embrapa Gado de Corte.
Data corrente: | 14/11/1997
Data da última atualização: | 05/11/2007
Autoria: | THIAGO, L. R. L. de S.; KELLAWAY, R. C.
Afiliação: | EMBRAPA. Centro Nacional de Pesquisa de Gado de Corte (Campo Grande, MS).
Título: | Botanical composition and extent of lignification affecting digestibility of wheat and oat straw and paspalum hay.
Ano de publicação: | 1982
Fonte/Imprenta: | Animal Feed Science Technology, v.7, n.1, p.71-81, jan. 1982.
Idioma: | Inglês
Notas: | CNPGC.
Conteúdo: | Samples of 1 kg of wheat straw, oat straw and paspalum hay were separated manually into botanical fractions, and the three largest fractions of each forage were analysed chemically for cell-wall constituents, silica and nitrogen. Proportions of digested dry matter, cellulose and hemicellulose, and potential digestibility for each of hese major botanical fractions were determindes when chaffed samples were placed in nylon baggs and incubated for 12, 24, 48, 72 and 96 h in the rumen of sheep fed on lucernc. Cross-sections of botanical fractions were stained with safranin and fast green, and proportions of lignifield tissue determined by ligh-microscopy and planimetry. Large differences in dry-matter digestibility between wheat straw and oat straw were attributedto the different proportions of botanical fractions. Within forages, stem was the larget fraction, the most lignified and had the  lowest potential digestibility. Proportions of digested dry  matter from botanical fractions at 12 h were poorly correlated with lignin content of dry matter (r = 0.25) but at 72 h. were negatively correlated with lignin content of dry matter (r = -0,84, P<0.01) and with proportions of  lignified tissue (r = -0,67, P<0,05) in the  respective botanical fractions. Proportions of cellulose and hemicellulose digested at 72 h were strongly correlated with lignin content of cell walls (r = -0,90,P<0,01; r = -0,85,P<0,01, respectively). Proportions of  lignified tissues were les closely correlated with all measurements of digestibility...
Palavras-Chave: | Feeding; Oat.
Thesagro: | Alimentação; Aveia; Carneiro; Composição Botânica; Digestibilidade; Feno; Gramínea; Gramineae; Nutrição; Palha; Trigo.
Thesaurus Nal: | botanical composition; digestibility; hay; nutrition; Paspalum; sheep; wheat.
Categoria do assunto: | --
Registro original: | Embrapa Gado de Corte (CNPGC)
Exemplares: | CNPGC - (6146-1) - UPC - AP - -- - 636.08505 -  - 636.08505 - DIS