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Vitamin B₁₂, APF Concentrate, and Dried Whey for Growing-Fattening Pigs^{1, 2}

Iowa Agricultural Experiment Station³

Abstract

Under the conditions of this growing-fattening experiment, using a corn-soybean oil meal basal ration fortified with vitamins and minerals, the following conclusions seem justifiable:

1. Using a vitamin B₁₂ concentrate, it appears that the practical vitamin B₁₂ requirement of growing-fattening pigs from weaning to 200 pounds in concrete drylot does not exceed 5 micrograms per pound of corn-soybean oil meal ration. A group of pigs fed crystalline vitamin B₁₂, was used as a standard reference.
   
2. Crystalline vitamin B₁₂ or a vitamin B₁₂ concentrate increased average daily gains 0.14 pound. This increase approaches significance at P=0.05.
   
3. The addition of 2 percent dried whey and 15 micrograms of vitamin B₁₂ per pound of ration significantly (P=.O5) increased average daily gains by 0.20 pound. Pigs fed rations containing dried whey, with and without vitamin B₁₂, grew at a more rapid rate (P=.O5), indicating that dried whey supplied growth factor(s) other than, or in addition to, vitamin B₁₂.
   

¹ Journal Paper No. J-1837 of the Iowa Agricultural Experiment Station, Ames, Iowa Project 930.

² This research was supported in part by a grant by Merck and Co., Inc., Rahway, New Jersey. The vitamin B₁₂ concentrate, crystalline vitamin B₁₂, niacin, pantothenic acid, pyridoxine, riboflavin, thiamin and choline chloride were generously supplied by Merck and Co., Inc., Rahway, New Jersey. APF supplement (Lot 26) and the folic acid were kindly supplied by Lederle Laboratories, Pearl River, New York. The dried whey was provided through the courtesy of Western Condensing Co., Appleton, Wisconsin. Vitamin B₁₂ assays were made by Chas. Pfizer Co., Inc., Brooklyn, New York.

³ Animal Husbandry Department, Ames, Iowa. Acknowledgement is made to Don Quinn, Animal Nutrition Farm foreman and his associates for their assistance.