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Ruminal Microbial Degradation of Individual Amino Acids from Heat-Treated Soyabean Meal and Corn Gluten Meal in Continuous Culture
Gargallo Ridao, Sílvia (Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments)
Ferret, Alfred (Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments)
Calsamiglia, Sergio (Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments)

Fecha: 2022
Resumen: Eight dual-flow continuous culture fermenters were used in three periods to study the effects of diets containing heat-treated soyabean meal (HSBM) or corn gluten meal (CGM) on ruminal microbial fermentation and the degradation of individual amino acids (AA). Treatments were a mix of non-protein nitrogen (N; urea and tryptone) that were progressively substituted (0, 33, 67 and 100%) for HSBM or CGM. Ruminal escape of AA was calculated with the slope ratio technique. Total volatile fatty acids (95. 0 mM) and molar proportions (mol/100 mol) of acetate (59. 3), propionate (21. 8) and butyrate (10. 5) were not affected by the treatments. As the level of HSBM or CGM increased, the concentration of ammonia-N and the degradation of protein decreased (p < 0. 01), and the flows of nonammonia and dietary N increased (p < 0. 01) quadratically. Compared with HSBM, CGM provided the highest flow (g/d) of total (20. 6 vs. 18. 3, p < 0. 01), essential (9. 04 vs. 8. 25, p < 0. 04) and nonessential (11. 5 vs. 10. 0, p < 0. 01) AA, and increased linearly (p < 0. 01) as the level of supplemental protein increased. Ruminal degradation of essential AA was higher (p < 0. 04) than nonessential AA in CGM, but not in HSBM. Degradation of lysine was higher (p < 0. 01) in both proteins, and degradation of methionine was higher in CGM. Ruminal degradation of individual AAs differ within and between protein sources and needs to be considered in precision feeding models.
Nota: Altres ajuts: Comisión Interministerial de Ciencia y Tecnología AGF97/0444
Derechos: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. Creative Commons
Lengua: Anglès
Documento: Article ; recerca ; Versió publicada
Materia: Soybean meal ; Corn glute meal ; Ruminal fermentation ; Amino acid
Publicado en: Animals, Vol. 12 Núm. 6 (3-2 2022) , p. 688, ISSN 2076-2615

DOI: 10.3390/ani12060688
PMID: 35327085


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