J. Anim Sci.
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J. Anim Sci. 1964. 23:1042-1045.
© 1964 American Society of Animal Science
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Performance and Carotene Conversion in Hereford Heifers Fed Different Levels of Nitrate1

Joe D. Wallace, R. J. Raleigh2 and P. H. Weswig3

Squaw Butte Experiment Station,,4 Burns and and Oregon State University, Corvallis

Abstract

Performance and the carotene-vitamin A status were studied in Hereford calves and yearlings fed 0.0, 0.6, and 1.2% calcium nitrate in diets containing 20% or 40% concentrates. The animals were fed a low carotene ration for approximately 100 days prior to the study in order to reduce liver vitamin A stores.

Daily gain and feed consumption were not significantly influenced by nitrate level in the diet. Animals fed diets containing 40% concentrate consumed more feed and gained at a faster rate than those fed 20% concentrate diets.

The addition of calcium nitrate to the ration had no apparent effect on carotene or vitamin A values of either the liver or plasma. Over the 100-day feeding period, increases in liver vitamin A storage were 69, 84, and 71 I.U./gm. liver for animals fed 0.0, 0.6, and 1.2% calcium nitrate, respectively.

Increases in liver vitamin A and carotene were greater for calves than for yearlings, while increases in plasma vitamin A and carotene were smaller. Methemoglobin showed no apparent treatment effects. Interactions of the different variables were non-significant on all blood, liver, and performance data.

Footnotes

1 Technical Paper No. 1779, Oregon Agricultural Experiment Station.

2 Squaw Butte Experiment Station.

3 Department of Agricultural Chemistry, Oregon State University.

4 Jointly operated by Oregon Agricultural Experiment Station and Crops Research Division, ARS, U.S.D.A.






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Copyright © 1964 by the American Society of Animal Science.