Effect of nonfiber carbohydrate and crude protein levels in the formula of feed on in vitro rumen fermentation characteristics and growth performance of weaned Hanwoo calves

This study was conducted to determine the effect of nonfiber carbohydrates (NFC) and crude protein (CP) present in formula feed on rumen fermentation characteristics growth performance weaned Hanwoo calves. Forty calves were randomly assigned four dietary groups based NFC CP levels as follows: high (HN) at 38%-42%, low (LN) 33%-36%, (HP) 25%-26%, (LP) 23%-24%. These categorized HN-HP, HN-LP, LN-HP, LN-LP groups. Total digestible nutrients (TDN) did not significantly affect vitro ruminal total gas, propionate, acetate, NH$_{3}$-N concentrations after 12 h incubation. Butyrate concentration higher group than HN-HP 6 incubation (p < 0.05). Neutral detergent fiber degradability lower The varying Therefore, HN HP had no significant performance. In summary, these results suggest that 33% 23% feeds are sufficient satisfying energy requirements