Protein and Carbohydrate Fractionation to Evaluate Perennial Ryegrass (Lolium perenne L.) Accessions

Author:

Gierus Martin1ORCID,Salama Heba Sabry Attia12ORCID,Lösche Marc13,Herrmann Antje14,Taube Friedhelm1

Affiliation:

1. Grass and Forage Science/Organic Agriculture Group, Institute of Crop Science and Plant Breeding, University of Kiel, 24118 Kiel, Germany

2. Crop Science Department, Faculty of Agriculture, Alexandria University, Aflaton St., El-Shatby, Alexandria 11865, Egypt

3. Bundesamt für Verbraucherschutz und Lebensmittelsicherheit, Bundesallee 51, 38116 Braunschweig, Germany

4. Landesbetrieb Landwirtschaft Hessen, 36251 Bad Hersfeld, Germany

Abstract

Precise information about carbohydrates and proteins in relation to their utilization in the rumen is useful for the breeding purposes of perennial ryegrass cultivars used for animal nutrition. The objective of the current study was to evaluate 20 diploid perennial ryegrass accessions from the intermediary heading stage. The ruminal kinetics of different carbohydrate and protein fractions of grasses and legumes are important for forage breeding programs. The Cornell Net Carbohydrate and Protein System (CNCPS) was used to provide such information. Accession-based variation can be observed after considering dynamic degradation processes. Variation among the 20 accessions was observed. Ruminally digested (RDC) and undigested (UDC) carbohydrate and ruminally degraded (RDP) and undegraded (UDP) protein contents, total carbohydrate and total protein contents, and carbohydrate and protein fractions for the first cut and annual averages show significant differences. Although the variation was smaller for the protein fractions, the calculated usable protein content (uCP, sum of UDP and amount of synthesized microbial protein in the rumen) in the small intestine is mainly influenced by decreasing the neutral detergent fiber (NDF) and increasing the sugar content among cultivars. Carbohydrate and protein fractionation is suitable for characterizing perennial grass accessions as it uses parameters relevant to ruminant nutrition, allowing a step forward in forage plant breeding for forage quality. To conclude, using parameters related to ruminal degradation kinetics should favor the selection of accessions with higher amounts of ruminally digested carbohydrates (RDC). The selection of accessions based on protein quality (proportion of UDP) is less favorable for achieving a higher usable protein content.

Funder

German Academic Exchange Service

Innovationsstiftung Schleswig-Holstein

Publisher

MDPI AG

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