Data/hora: 16/06/2024 04:44:28

Biblioteca(s): | Embrapa Pecuária Sudeste.
Data corrente: | 18/04/2023
Data da última atualização: | 18/04/2023
Autoria: | WANDERLEY, R. D. C.
Afiliação: | RUY DA CARVALHEIRA WANDERLEY, CPPSE.
Título: | Automated total collection and indicator methods for estimating digesta flow in steers fed roughage or concentrate diets.
Ano de publicação: | 1982
Fonte/Imprenta: | Tucson: The University of Arizona, 1982.
Páginas: | 108 f.
Idioma: | Inglês
Conteúdo: | Automated total collection (ATC) of digesta from four streers fitted with doudenal re-entrant cannulas was compared wid flow estimations based on Cr203 and acid detergent lignin concentrations of ATC samples. In two successive periods, each was fed about 4 kg daily of an all-roughage or an 80% sorghum grain diet. Digesta samples were automatically taken and pooled every 2 hr, 3- to 6-day collections. Sample aliquots, representing 4% of the digesta measurd in eanch 2 hr were pooled to represent 24-hr digesta flow. Data of 2-hr samples were used to study diunal flow patterns. Doudenal digesta and dry matter flow rates estimated by Cr203 and lignin were grater by ~15% than flow rates measured by ATC. Mean recoveries of Cr3o3 and lignin at the duodenum were 93 and 89%, respectively. Animals fed the roughage diet had about 55% greater digesta flow rates than fed the concentrate diet (42 versus 65 1 daily average by ATC). The appeared to be an interaction between diets and and markers. Apparent ruminal dry matter digestibility caluculated from direst measurements by ATC was 44% for the concentrate diet and 37% for the roughage diet. Rumen digestibility values based on Cr203 and lignin were about 25% lower than the ATC values. Average coefficients of diurnal variation for digesta flow were 29% in the concentrate diet 34% in the roughage diet. Estimations from Cr2o3 and lignin based on 2-hr samples coul either under- or overestimate digesta flow by 31 to 350% of the 24-hr flow based on TAC. Thus special emphasis should be given to the problem of sampling procedures when using indicators and spot-sampling technique to estimate digesta flow. There was evidence of a 24-hr cycle for the whole digesta flow in the grain diet, with a period of low before the onset of the light hours. No consistent flow pattern could be identified in the roughage diet. Lignin concentration patterns in digesta were somewhat similar for both diets; however, Cr2o3 patterns were diferent between diets. Digesta dry matter concentration followed a similar pattern to that of Cr2o3 inthe grain diet and to that of lignin in the roughage diet, suggesting that the flow pattern of solid phase components of digesta may also be differentially affected by the dietary concentrate: roughage ratio.
Palavras-Chave: | Alimento concentrato.
Thesagro: | Digestão; Nutrição Animal.
Thesaurus Nal: | animal nutrition; concentrates; digesta; digestion.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
Registro original: | Embrapa Pecuária Sudeste (CPPSE)
Exemplares: | CPPSE - (25979-1) - ADD - TS - DD - PROCI-1982.00040 - WAN - 2023.00076 - DIS