Estimation of the effect of temperature during
dehydration of grass on true digestibility of rumen
undergraded dietary protein using rats

The aim of this study was to determine the effect of different dryer outflow temperatures (123 vs. 153°C) imposed during dehydration of grass, on the digestibility of rumen undegraded dietary protein (UDP) in rats. UDP was the residue obtained after incubation of dehydrated grasses (DG123 and DG153) in the rumen of sheep for 12 hours. The protein in the diets for rats was derived from egg white (70%) and UDP (30%). Compared to DG123, DG153 had a higher proportion of ADIN in total N (10.46 vs. 23.91%) as well as significantly higher ruminal degradability (39.8 vs. 34.6; P < 0.01). In the trial with rats, both apparent and true digestibility of UDP from DG153 (88.0 and 92.6%) were significantly higher than from DG123 (85.7 and 90.5%). This may suggest that a temperature of 153°C can protect protein against degradation in the rumen without any unfavourable effect on intestinal digestibility.

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1230-1388

Assigning DOI numbers, introducing articles from supplements and recent publications to POL-index database, maintaining anti-plagiarism detection, electronic system to proceed manuscripts and webpage of the Journal with interactive pdf files, and language correction of manuscripts published in Journal of Animal and Feed Sciences are financed in the years 2018–2019 by the Ministry of Science and Higher Education from the funds for science popularization activities, Agreement No. 631/P-DUN/2018.