Effect of pre-activated Saccharomyces cerevisiae or malate salts on fermentation of ground barley grain under in vitro conditions simulating intensive ruminant feeding

Amanzougarene, Z ; Yuste, S ; Fondevila, M (Universidad de Zaragoza)

Resumen: Aim of study: To determine the dose response of Saccharomyces cerevisiae on rumen fermentation of concentrates, and to compare it with the effect of malate salts. Material and methods: S. cerevisiae (0.7, 1.4 and 2.1 mg/g) and malic acid salts (4, 8 or 12 mg/g) were added to barley and compared with barley alone (CTL), in three 24 h in vitro incubation series, using rumen inocula from beef cattle receiving a high concentrate diet. Yeasts were pre-activated by aerobic incubation for 24 h at 30 degrees C. Incubation pH was recorded at 8 and 24 h and volatile fatty acids (VFA) and lactate at 8 h were analysed. Main results: Gas produced with S. cerevisiae was higher than malate (p<0.001). Yeast addition linearly (p<0.01) and quadratically (p<0.05 at 4 h and from 10 to 18 h) increased gas production, but no dose response to malate levels was observed. Dry matter disappearance at 24 h was not affected by S. cerevisiae but increased linearly with malate. Microbial mass linearly increased with the level of yeast (p<0.01) and malate (p=0.09). Adding yeasts did not affect 8 h total VFA concentration compared with CTL, but linear valerate (p<0.01) and butyrate (p=0.092) increases, and a decrease of acetate (p=0.064) were detected. Malate salts linearly increased (p<0.05) total VFA concentration but did not affect VFA proportions. Research highlights: Addition of active yeasts linearly increased barley fermentation and microbial synthesis, whereas the effect of malate salts was of minor magnitude.

Idioma: Inglés

DOI: 10.5424/sjar/2021192-17728

Año: 2021

Publicado en: Spanish Journal of Agricultural Research 19, 2 (2021), e06SCO2 [7 pp]
ISSN: 1695-971X

Factor impacto JCR: 1.233 (2021)

Categ. JCR: AGRICULTURE, MULTIDISCIPLINARY rank: 37 / 60 = 0.617 (2021) - Q3 - T2

Factor impacto CITESCORE: 1.9 - Agricultural and Biological Sciences (Q3)

Factor impacto SCIMAGO: 0.291 - Agronomy and Crop Science (Q3)

Financiación: info:eu-repo/grantAgreement/ES/FEDER/UIDB/04011/2020
Financiación: info:eu-repo/grantAgreement/ES/MECD/FPU-Formación de profesorado universitario
Financiación: info:eu-repo/grantAgreement/ES/MINECO-DGA-FSE/AGL2013-46820

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Producción Animal (Dpto. Produc.Animal Cienc.Ali.)