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Garcés Narro, CarlosAuthor

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June 25, 2019
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Degradation in the rumen of treated and untreated soya bean meal proteins

Publicated to: Annales De Zootechnie. 48 (4): 263-273 - 1999-08-01 48(4), DOI: 10.1051/animres:19990403

Authors: Aufrère, J; Garces, C; Graviou, D; Hernando, I; Demarquilly, C

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Abstract

In order to estimate the quantity of solubilized nitrogen in the rumen that can contribute to intestinal feed non-ammonia nitrogen, degradation in the rumen was studied both for a control soya bean meal (cSBM) and a treated one (tSBM) to assess simultaneously the kinetics of: 1) protein disappearance from rumen bags and 2) rumen fluid contents in various nitrogen fractions in the rumen fluid: total nitrogen (Nt), ammonia nitrogen (NH3-N), non-ammonia nitrogen (NAN), peptides-N and amino acids-N, and true protein (protein-N). Measurements were taken on four sheep fed successiveIy with four diets consisting of hay plus one of the two meals, in the proportion of 40% and 20% control meal (cSBM 40% and cSBM 20%), 40% treated meal (tSBM) and a control diet based on hay alone supplemented with starch and urea (HSU). The effective degradability estimated with the nylon bag method was 0.727 and 0.502 for cSBM and tSBM, respectively. Sodium dodecyl sulphate gel electrophoresis (SDS-PAGE) showed that the cSBM conglycinins were degraded at a higher rate in the rumen than glycinins. The same proteins were degraded at a slower rate in the tSBM. Most of the nitrogen degraded in the rumen fluid was in NH3-N form, and only 30% as NAN. For cSBM, NAN comprised protein-N (concentration was low 1 and 2 h after feeding), peptides-N and amino acids-N, while for the treated meal the NAN comprised solely peptides-N and amino acids-N. These results showed that for soya bean meal - a feed in which the dietary proteins are strongly degraded at moderate rates - very little of the solubilized proteins from the bags can escape degradation in the rumen. Whatever the meal studied (treated or untreated), the estimation of feed NAN in rumen fluid able to escape degradation in the rumen compared to the degraded proteins (calculated from the degradation in nylon bags) was negligible (about 1%). ((C) Elsevier / Inra).

Keywords

Control soya bean mealDairy-cattleDegradabilityElectrophoresisFractionsIn-situInvitroPolyacrylamide-gel-electrophoresisProductsProtein degradationRumen fluid compositionRuminal degradationSolubilitySoybean-mealTreated soya bean meal

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Annales De Zootechnie, and although the journal is classified in the quartile Q3 (Agencia WoS (JCR)), its regional focus and specialization in Veterinary Sciences, give it significant recognition in a specific niche of scientific knowledge at an international level.

Independientemente del impacto esperado determinado por el canal de difusión, es importante destacar el impacto real observado de la propia aportación.

Según las diferentes agencias de indexación, el número de citas acumuladas por esta publicación hasta la fecha 2025-12-14:

  • WoS: 14
  • Scopus: 13

Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-12-14:

  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 13 (PlumX).

It is essential to present evidence supporting full alignment with institutional principles and guidelines on Open Science and the Conservation and Dissemination of Intellectual Heritage. A clear example of this is:

  • The work has been submitted to a journal whose editorial policy allows open Open Access publication.

Leadership analysis of institutional authors

This work has been carried out with international collaboration, specifically with researchers from: France.