Effect of yeast culture supplement on production, rumen fermentation, and duodenal nitrogen flow in dairy cows

Six lactating Holstein cows fitted with rumen and T-type duodenal cannulas were used in a crossover design to examine effects of yeast culture supplement on production parameters, rumen fermentation, and flow of N to the duodenum. Treatments were control and control plus 10 g/d of yeast culture. Dry...

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Bibliographic Details
Published in:Journal of dairy science 1992-11, Vol.75 (11), p.3056-3065
Main Authors: Erasmus, L.J. (Irene Animal Production Institute, Irene, Republic of South Africa), Botha, P.M, Kistner, A
Format: Article
Language:English
Subjects:
ACIDE AMINE
AMINOACIDOS
Animal Feed
Animals
BACTERIA
Cattle - metabolism
Cattle - physiology
CELLULOLYSE
CELULOLISIS
COMPLEMENT ALIMENTAIRE
COMPOSICION QUIMICA
COMPOSITION CHIMIQUE
CONTENIDO DE MATERIA SECA
DEBIT
DIGESTIBILIDAD
DIGESTIBILITE
Duodenum - metabolism
EXTRACTOS VEGETALES
EXTRAIT D'ORIGINE VEGETALE
Female
Fermentation
GASTO
INGESTION DE PIENSO
INTESTIN
INTESTINOS
Lactation - physiology
LAIT
LECHE
LEVADURA
LEVURE
MICROORGANISME
MICROORGANISMOS
Nitrogen - metabolism
PRISE ALIMENTAIRE (ANIMAUX)
RENDEMENT LAITIER
RENDIMIENTO LECHERO
RUMEN
Rumen - metabolism
Saccharomyces cerevisiae
SUPLEMENTOS DE PIENSOS
TENEUR EN MATIERE SECHE
VACAS LECHERAS
VACHE LAITIERE
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Summary:Six lactating Holstein cows fitted with rumen and T-type duodenal cannulas were used in a crossover design to examine effects of yeast culture supplement on production parameters, rumen fermentation, and flow of N to the duodenum. Treatments were control and control plus 10 g/d of yeast culture. Dry matter intake was greater, and milk production tended to be higher, for cows supplemented with yeast culture, but milk composition was not affected. Rumen pH was not affected by yeast culture, but peak lactic acid concentration decreased from 1.93 to 1.73 mm. Rumen fluid acetate:propionate ratio, dilution rate (percentage per hour), and ammonia N concentration (milligrams per deciliter) were 2.28, 0.12, and 10.7 and 2.04, 0.13, and 9.6 for control cows and for cows supplemented with yeast culture, respectively. Although numbers of fiber-digesting bacteria were not affected by yeast culture, DM disappearance of wheat straw tended to be higher at 12 and 24 h, and CP and ADF digestibilities were greater, Duodenal NAN flow tended to be higher in cows supplemented with yeast culture because of higher bacterial N flow. Duodenal AA profile, and flow of Met were significantly affected by yeast culture supplementation. The results suggest that yeast culture may alter the AA profile of bacterial protein
ISSN:0022-0302
1525-3198
DOI:10.3168/jds.s0022-0302(92)78069-2