Effects of concentrate on barley silage and nitrogen utilization by lactating cows fed large amounts of urea

Polan, C.E.; Chandler, P.T.; Sandy, R.A.

Journal of Dairy Science 53(11): 1584-1586


ISSN/ISBN: 0022-0302
PMID: 5530307
DOI: 10.3168/jds.s0022-0302(70)86440-2
Accession: 014451370

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Barley forage with 41% DM was ensiled with 0.5% urea and offered to appetite for 40 days to 4 groups of 8 cows in addition to concentrates containing protein and urea similar to the barley silage. Concentrates supplied none of the total digestible nutrient requirements or 25, 50 or 75%. On days 32 to 35 digestibility and N balance were estimated on the 5 cows with highest yields in each group. When concentrate intake was increased there was an increase in total intake and fat-corrected milk and in the digestibilities of DM and N-free extract, while digestibilities of crude fibre and acid-detergent fibre and intake of silage decreased.