Comparison of different maize stalk sources in China's dairy production based on the Cornell system

摘要

For optimising the use of maize stalks in China's dairy production system, dry maize stalks (DMS), maize stalk silage (MSS) and high oil maize silage (HOMSS) were compared at 11 concentrate/ roughage (C/R) levels from 25/75 to 75/25 with maize stalks used as a sole roughage source in the TMR. The Cornell system V5.0 was used as the base model in computer simulation. Actual chemical analyses of DMS, MSS and HOMSS were used in feed database. Results indicated that the HOMSS, MSS and DMS based TMR supported milk yield up to 28,25 and 23 kg/d, respectively. At the same C/R level, HOMSS supported the highest milk yield with the highest economic return and the lowest concentrate consumption and the lowest N excretion per kg of milk. DMS supported the lowest milk yield with the lowest economic return, the highest concentrate consumption and the highest N excretion per kg of milk.