In vitro degradability of protein from Brazil semiarid arboreal speccies

Abstract

This experiment was carried out to
evaluate the protein degradability in vitro of arboreal
plants from Brazilian semi-arid. The plants tested were
angico (Anadenanthera colubrina), algaroba (Prosopis
juliflora), espinheiro (Acacia glomerosa), juazeiro
(Ziziphus joazeiro) and soybean meal, which had crude
protein values of 22,5 16,0, 22,0, 19,0 and 38,0%,
respectively. Samples (60 mg) were incubated with
McDougal (8 ml) and inoculated ruminal fluid (2 ml).
Aliquots (1 ml) were taking after 0, 6, 12, 24, 36 and 48
hours for analysis of ammonia, soluble protein and
microbial protein. Soybean meal and the algaroba
showed larger ammonia production and concentration
of soluble protein compared to the other treatments.
Soybean meal also displayed higher values for microbial
protein. The treatment with angico was the one that
displayed closed values towards soybean in regard to
microbial protein, in spite of showing lesser ammonia
production. The largest value of potential degradability
66,47%, was observed for the treatment with soybean
meal, followed by the algaroba 46,27% and of the angico
45,20. Very low degradability was observed for the
espinheiro and juazeiro, 19,16 e16,63%, respectively.
Among the studied plants the angico and the algaroba
were better sources of protein.