Influence of dietary buffer value index on the ruminal milieu of lactating dairy cows fed sorghum silage and grain.
J Dairy Sci
; 76(11): 3571-9, 1993 Nov.
Article
em En
| MEDLINE
| ID: mdl-8270700
ABSTRACT
The objective of this study was to evaluate the influence of dietary buffer value index on ruminal fluid pH, buffering capacity, and buffer value index in lactating cows. Three Holstein cows averaging 18 +/- 10 DIM were used in a 3 x 3 Latin square with 3-wk experimental periods. Diets contained grainsorghum silage DM ratios of 5050, 6040, and 7030. By analysis, these diets had buffer value indexes of -74, -41, and -7. The analyzed dietary buffer value index of the total diets was higher than the index that was calculated from the buffer value index of individual ingredients. Although milk fat content tended to be highest for milk from cows fed the 5050 concentrate to forage diet and although milk protein production was highest for cows fed the 7030 concentrate to forage diet, milk yield, 4% FCM, milk fat yield, protein content, and milk fat content were not significantly affected by dietary buffer value index. Dietary buffer equivalents were calculated to be 11% of total buffering equivalents available to the cow, and dietary acid equivalents were 15% of total acid production in the rumen. Compared with ruminal acid production and salivary buffering in the rumen, dietary acid and dietary buffer contributions to the acid-base balance of the cow are minor quantitatively. Ruminal fluid pH, hydrogen ion concentration, buffer value index, buffering capacity, and total VFA were not affected significantly by dietary buffer value index. Hence, dietary acid-base status alone is inadequate as a predictor of the need for buffers in the diet of lactating cows.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Silagem
/
Lactação
/
Bovinos
/
Grão Comestível
/
Ração Animal
Limite:
Animals
Idioma:
En
Revista:
J Dairy Sci
Ano de publicação:
1993
Tipo de documento:
Article