Abstract
Abstract The effects of level and degradability of rapeseed meal on ration digestibility, N balance, urinary purine derivatives excretion, milk production and milk composition in dairy cows were studied. A total of 24 multiparous lactating diary cows were selected from a production experiment and divided into two 12-cow groups according to their lactation stage (LG1, 14th-16th week of lactation; and LG2, 26th-30th week of lactation). Within lactation groups, cows were fed four different rations (3 cows per treatment). Four concentrate mixtures with two levels of protein (19% and 14% of CP on DM basis) and two different rumen degradabilities (72% and 52%) of the dominating protein feed rapeseed meal were fed to the cows together with pasture silage and hay. Apparent total tract digestibilities were not affected by the treatments. N balance was positive and similar between diets in both lactation groups. N partition data were similar between treatments on LG1, while on LG2 a tendency for a more efficient us...
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Schedule a callMore From: Acta Agriculturae Scandinavica, Section A - Animal Science
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