PROTEIN QUALITY OF LEGUME-CEREAL MIXTURES IN RUMINANTS' NUTRITION

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Zuzana Formelová
Mária Chrenková
Zuzana Mlyneková
Jan Pozdíšek
Oldřich Látal
Matúš Rajský

Abstract

Legumes are the most important crops within sustainable agriculture. In animal nutrition they represent an important source of proteins. The aim of this study was to focus legumes and legume-cereal mixtures as a suitable source of protein in ruminants' nutrition. The influence of climatic conditions on the nutritional value of legumes and legume-cereal mixtures in two years of growing were compared. Quality of feed protein was studied according to the Cornell Net Carbohydrate and Protein System (CNCPS) chemical fractionation method. The highest value of fraction A was determined in 2015 in a monoculture – as high as 39.9 % in peas with leafs, in 2017 it was highest in the mixture of peas with leafs and wheat (40.7 %). During the second harvest of 2015, the amount of soluble crude protein (A) decreased in the monoculture of leafy peas by 11 % down to 28.6 %. Important for feed quality evaluation are the values of fractions B2 and B3. These are proteins that are slowly soluble in the rumen, which increases their by-pass into the intestine as well as their digestibility. Fraction B2 content exceeded 40 % in all samples from 2015. The highest fraction B2 content 52.6 % was determined in a mixture of faba bean and oats in the first harvest. The lowest value was determined in 2017 in peas with leafs-wheat mixture in both harvests (30.6 % and 35.6 %).

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