Effect of consecutive cut and vegetation stage on CNCPS protein fractions in alfalfa (Medicago sativa L.)
2014
Marković, J. (Institute of Forage Crops Kruševac, Globoder (Serbia)) | Dinić, B. (Institute of Forage Crops Kruševac, Globoder (Serbia)) | Terzić, D. (Institute of Forage Crops Kruševac, Globoder (Serbia)) | Blagojević, M. (Institute of Forage Crops Kruševac, Globoder (Serbia)) | Anđelković, B. (Institute of Forage Crops, Kruševac (Serbia)) | Zornić, V. (Institute of Forage Crops Kruševac, Globoder (Serbia)) | Vasić, T. (Institute of Forage Crops Kruševac, Globoder (Serbia))
Crude protein (CP) of forages can be separated into fractions of differentiated abilities to provide available amino acids in the lower gut of ruminants. This knowledge is critical to develop feeding systems and to predict animal responses. The objective of this research was to asses whether CP concentrations and the relative proportion of CP fractions by CNCPS in alfalfa (Medicago sativa L.) cv K-28 were affected by different cuts and vegetation stages. Fraction B2, which represents true protein of intermediate ruminal degradation rate, was the largest single fraction in all cuts except in the third cut. Soluble fraction A was less than 400 g kg-1 CP in all cuts except in the third cut, while the unavailable fraction C ranged from 56 g kg-1 CP in the first cut to 134.8 g kg-1 CP in the fourth cut. The remaining fraction B3 (true protein of very low degradation rate) only represented less than 60 g kg-1 of total CP. Results showed that undegraded dietary protein represented a small proportion of total CP in alfalfa from the first to the fourth cut.
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