Variation of lupin protein degradation in ruminants studied in situ and using chemical protein fractions

Animal : an International Journal of Animal Bioscience
N TitzeMarkus Rodehutscord

Abstract

The main objective of this study was to evaluate the variability in in situ CP degradation characteristics of 15 batches lupin grains from nine genotypes in a standardised approach. This study also investigated whether differences in CP degradation can be described by protein fractionation using the Cornell Net Carbohydrate and Protein System (CNCPS) and also whether thermal processing of lupins has an effect on CP degradation in the rumen and analysed protein fractions. The rising political and consumer demand for milk products from dairy production systems based on domestic protein sources and the wide range of lupin types and varieties that can be chosen as protein feed in dairy nutrition requires research to determine the variability in CP degradation characteristics in the rumen. For CP degradation measurements, ground grains were incubated in the rumen of three lactating Jersey cows fitted with a ruminal cannula for different times from 2 to 48 h, and the washing loss of non-incubated samples was also measured. Protein fractions were analysed according to CNCPS and used for the estimation of ruminally degraded protein. In situ CP degradation parameters varied widely between untreated samples. The mean value for the washou...Continue Reading

References

Nov 14, 1998·Journal of Animal Science·E S VanzantE C Titgemeyer
Dec 17, 2014·Journal of the Science of Food and Agriculture·Serena CalabròBiagina Chiofalo

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