Data/hora: 21/06/2024 03:40:11

Biblioteca(s): | Embrapa Caprinos e Ovinos.
Data corrente: | 27/12/2016
Data da última atualização: | 27/12/2016
Autoria: | BLACK, J. L.; BEEVER, D. E.; FAICHNEY, G. J.; HOWART, B. R.; GRAHAM, N. McC.
Título: | Simulation of the effects of rumen function on the flow of nutrients from the stomach of sheep: Part 1 - Description of a computer program.
Ano de publicação: | 1981
Fonte/Imprenta: | Agricultural Systems, v. 6, n. 3, p. 195-219, Feb. 1981.
DOI: | 10.1016/0308-521X(81)90002-0
Idioma: | Inglês
Conteúdo: | Abstract: A computer program to simulate rumen function in sheep is described. It predicts the degradation of dietary components within the rumen, products of fermentation, microbial growth yields and the flow of protein and other materials from the rumen. Input information includes: feed intake; modulus of fineness of the diet, chemical composition of the diet in terms of ?-hexose, ?-hexose, soluble carbohydrates, true protein, non-protein nitrogen, total fatty acids, inorganic sulphur and ash; potential degradability of ?-hexose and protein; factors indicating the fractional reduction in maximum rate of degradation of ?-hexose, ?-hexose and protein due to chemical and physical properties of the diet; and time spent feeding and ruminating. Inflow to the rumen of protein, non-protein nitrogen and inorganic sulphur in saliva is predicted, and the amount of each salivary and dietary substrate degraded in the rumen, flowing intact from the rumen or accumulating within the rumen is assessed. Adenosine triphosphate (ATP) released during fermentation is used for maintenance of the existing microbial mass. If ATP release is insufficient a portion of the microbial mass is catabolised, otherwise microbial growth can occur and some degraded substrates are incorporated directly into microbial protoplasm. Possible limits to microbial growth from an insufficiency of amino acids, ammonia, total nitrogen or inorganic sulphur are assessed, and the change in rumen microbial population is determined from the difference between growth and outflow of micro-organisms. Predictions from the program are shown to be stable and to respond appropriately to changes in intake and composition of the diet.
Palavras-Chave: | Rumen Simulation Technique.
Thesagro: | Modelo de simulação; Modelo matemático; Nutrição animal; Ovino; Rúmen.
Thesaurus Nal: | Animal models; Sheep; Simulation models.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
Registro original: | Embrapa Caprinos e Ovinos (CNPC)
Exemplares: | CNPC - (32265-1) - ADD - AP - PP -  -  -  - DIS