Influence of supplemental niacin with and without NPN on performance of lactating dairy cows

Gubert, K.; Huber, J.T.

Journal of Dairy Science 62(Suppl 1): 78-79

1979


ISSN/ISBN: 0022-0302
Accession: 000681896

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Abstract
4 groups of 4 early- and 4 mid-lactation Holstein-Friesians in a 2 X 2 factorial design experiment with a 10-wk treatment period were fed maize silage ad lib., lucerne hay at 2.2 kg/day and concentrates according to production. For the 4 treatments, natural protein with or without niacin at 6 g/day and non-protein N with or without niacin, av. lactation persistency was 92.9, 88.6, 90.9 and 88.1%, differences were not significant. Milk N was higher in the niacin groups but the difference was not significant.