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Journal of Dairy Science Vol. 46 No. 10 1089-1093
© 1963 by American Dairy Science Association ®
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Effect of a Highly Fortified Vitamin-Mineral Supplement in High- and Low-Concentrate Rations for Dairy Cows1

R. T. Lovell2 and L. L. Rusoff

Department of Dairy Science, Louisiana State University, Baton Kouge

ABSTRACT

Sixteen high-producing Holstein cows were used in a 112-day continuous feeding trial to study the effect of feeding a highly fortified vitamin-mineral supplement with 15:85 and 60:40 hay-concentrate ratios on milk yield and composition, conversion of total digestible nutrients (TDN) to fat-corrected milk (FCM), and digestibility of the rations. The cows fed the supplemented low-concentrate ration maintained their level of FCM production significantly (P < .05) better than those receiving the nonsupplemented low-concentrate ration; however, supplementation showed no advantage with the high-concentrate ration. The change in FCM production over the experimental period was not significantly different between the high- and low-concentrate rations. The conversion of TDN to FCM was significantly (P < .01) greater for the high-concentrate rations than for the low-concentrate rations; however, the average TDN intake from the high-concentrate rations was 16.7% less than that from the low-concentrate rations. Supplementation had no effect upon conversion of TDN to FCM. The milk fat percentage decreased markedly during the first 4 wk for the high-concentrate rations but increased during the remainder of the trial to a level comparable with that of the low-concentrate rations. There were no significant differences between TDN coefficients of the rations due to supplementation or hay-concentrate ratio.

FOOTNOTES

1 The data were taken from a portion of a thesis submitted by the senior author to the Graduate School of Louisiana State University in partial fulfillment of the requirements of the Doctor of Philosophy degree.

2 Department of Food Science and Technology, Louisiana State University, Baton Rouge.






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