A comparison of ad libitum concentrate, restricted concentrate and normal ration feeding for alterations in fat metabolism in lactating Holsteins

Zanartu, D.; Polan, C.E.; McGilliard, M.L.

Journal of Dairy Science 62(Suppl 1): 202


ISSN/ISBN: 0022-0302
Accession: 000581905

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3 groups of 7 Holstein-Friesians in mid lactation were fed for 30 days a normal ration with 14% crude protein (CP) and 22% crude fibre (CF) ad lib.; concentrate with 15.7% CP and 11.7% CF ad lib.; or concentrate restricted to energy intake of normal ration. Least square mean and s.e. for milk yield was 18.5 plus or minus 0.4, 20.9 plus or minus 0.4 and 18.8 plus or minus 0.5 kg and for milk fat % was 3.61 plus or minus 0.1, 2.5 plus or minus 0.2 and 3.3 plus or minus 0.1, difference significant at P <0.01.