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Chemical Composition, In Vitro Digestibility and Rumen Fermentation Kinetics of Agro-Industrial By-Products.

Jairo García-Rodríguez^1,2, María José Ranilla^3,4, James France⁵

¹Departamento de Producción Animal, Universidad de León, E-24007 León, Spain. jgarr@unileon.es.

Animals : an Open Access Journal From MDPI

|October 27, 2019

Summary

Agro-industrial by-products offer diverse nutritive value for ruminant rations. Analysis revealed significant variation in chemical composition, digestibility, and fermentation, enabling their use as alternative feed ingredients.

Keywords:

digestibility feedstuff gas production technique hierarchical clustering multivariate data analysis nutritive value ruminant

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Area of Science:

Animal Science
Agricultural Chemistry
Ruminant Nutrition

Background:

Agro-industrial by-products represent a significant source of underutilized feed resources.
Assessing the nutritive value of these by-products is crucial for sustainable ruminant feeding systems.

Purpose of the Study:

To evaluate the nutritive value of 26 diverse agro-industrial by-products.
To characterize their chemical composition, in vitro digestibility, and rumen fermentation kinetics.
To identify potential applications of these by-products in ruminant diets.

Main Methods:

Chemical composition analysis of 26 agro-industrial by-products.
In vitro digestibility and rumen fermentation kinetics assays.
Multivariate and principal component analyses (PCA) for data interpretation.

Main Results:

Significant variability in chemical composition, digestibility, and fermentation kinetics was observed across by-products.
Multivariate cluster analysis grouped by-products into four distinct categories (A-D).
Highly degradable by-products included citrus pulps (Group D), while less degradable ones were olive tree leaves, pepper skins, and grape seeds (Group A).

Conclusions:

Most evaluated agro-industrial by-products possess suitable nutritive value for inclusion in ruminant rations.
These by-products can serve as alternative sources of energy, protein, soluble fiber, or roughage.
Tailoring by-product selection to specific nutritional needs enhances ruminant diet formulation.