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Effect of Various Levels of Fluorine, Stilbestrol, and Oxytetracycline, in the Fattening Ration of Lambs

Utah Agricultural Experiment Station, Logan^,3

Abstract

Seventy-two weanling wether lambs consisting of equal numbers of Columbia, Rambouillet, and Targhee, were randomly allotted to the following treatments in a factorially designed experiment: Fluorine levels in the dry diet were 17, 50, 100, and 200 ppm; oxytetracycline levels were 0, 10, and 20 gm. per ton of feed; half the lambs were implanted with 12 mg. of stilbestrol and the other half were not implanted with stilbestrol.

The conclusions were: Fattening lambs can consume a diet containing at least 100 ppm of fluorine (added fluorine in the form of sodium fluoride) on a dry basis for 84 days without affecting feedlot performance. However, when lambs were fed a diet containing 200 ppm of fluorine for 84 days, they consumed less feed, and consequently gained less and had lower carcass grades than lambs receiving 100 ppm or less fluorine in their diet. Therefore, the tolerance level of fluorine in the dry diet of fattening lambs is between 100 and 200 ppm of fluorine.

¹ Present address, Squaw Butte-Harney Experiment Station, Burns, Oregon.

² Professor Animal Husbandry; Research Assistant Animal Husbandry; Associate Professor Animal Hubandry; Professor Veterinary Science; Associate Professor Animal Husbandry; and Professor Chemistry, respectively.

³ Supported in part by research grants from Chas. Pfizer and Co., Inc., Terre Haute, Ind. and Columbia-Geneva Steel Division, United States Steel Corporation, Provo, Utah. Report on projects 438 and 364. Approved for publication as journal paper No. 245, 1962.