An assessment of differences in the ruminal degradability and intestinal digestibility of crude protein in brewer's grains and maize draff
2012
Majer, V., Victus LA, Ostrava (Czech Republic) | Vesely, P., Mendelova Univ., Brno (Czech Republic). Ustav Vyzivy Zvirat a Picninarstvi
The differences between the ruminal degradability and intestinal digestibility of crude protein (CP) contained in brewer's grains (BG) and maize draff (AMG) were investigated using the in sacco method on 3 dry Holstein cows fitted with rumen cannulas. The dynamics of ruminal CP degradability was detected after 0, 4, 8, 16, and 24 hours of samples incubation in the rumen. The intestinal CP digestibility undegradable in the rumen was determined using the mobile bag method on 3 dry Holstein cows fitted with duodenal cannulas. The CP degradability of BG was detected in the above-mentioned hours (%) as follows: 4.06; 18.16; 32.40; 38.56, and 50.70, resp.; CP degradability of AMG was 42.04; 63.56; 84.47; 85.16, and 87.19, resp. The effectiveness of rumen degradability of BG CP at the rate of passage of rumen content 6 % per hour was calculated at 35.33 % and that of AMG at 76.29 %. Intestinal digestibility of BG CP and dry matter at the rate of passage of intestinal content 6 % per hour was calculated at 79.41 % and 22.84 %, resp., and that of AMG at 57.01 % and 11.33 %, resp. The differences between the indicators of both feedstuffs were significant. The results show that BG are mostly a source of CP with higher intestinal digestibility than AMG.
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