Influence of flame roasting and feeding frequency of ...
|Title||Influence of flame roasting and feeding frequency of barley on performance of dairy cows|
|Author(s)||P. Robinson, M. McNiven|
|Journal||Journal of dairy science|
|Abstract||In Experiment 1, 24 multiparous cows in early lactation were given a basal diet for ad lib. intake consisting of 24.3% (DM) maize silage, 25.9% whole crop barley silage, 33.1% lucerne silage and 16.7% of a protein supplement. Raw barley grain, or barley flame roasted to reduce its rate of rumen degradation, was given twice daily or 7 times daily. Of the 24 cows offered roasted barley, 3 refused to consume it even after 2 weeks. Thus, results are for the 21 cows that consumed raw and roasted barley. Cows given raw barley 7 times ate more DM, OM, NDF and CP than cows given raw barley twice daily and also produced more milk, protein and lactose. Cows given roasted barley twice daily ate more NDF than those given raw barley twice daily and also produced more milk, protein and lactose. No benefit resulted from increasing the feeding frequency of roasted barley from 2 to 7 times daily. Experiment 2, conducted to investigate the apparent unpalatability of roasted barley, showed that cows given a total mixed ration (TMR) containing 40% (DM) of the roasted barley used in experiment 1 consumed less NDF but tended to produce more lactose. Based on results of both experiments, if raw barley is fed alone, it should be given more than once per day to maximize production. However, infrequent feeding of roasted barley is an acceptable alternative, if the cows will consume the roasted barley. When barley can be given more than once per day or in a TMR, benefits of roasting appear to be negligible..|
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