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Effect of Chlortetracycline Supplementation on Growth and Feed Utilization of Unsuckled Baby Pigs Obtained by Hysterectomy^{1, 2,}

The Hormel Institute, University of Minnesota³

Abstract

Twelve experiments were conducted with baby pigs taken by hysterectomy and reared in isolation; approximately half of the pigs were supplemented with chlortetracycline.

Three of the first four experiments (13 out of 15 supplemented baby pigs) showed greater weight gains for the pigs supplemented with 10 p.p.m. chlortetracycline.

In all of the eight additional experiments conducted from 0 to 56 days, the chlortetracycline-supplemented pigs (10 p.p.m. up to 3 weeks, 200 p.p.m. from 3 to 8 weeks) showed greater average daily gains. Feed utilization appeared to be better in supplemented pigs.

Baby pigs held in isolation units to 24 days of age showed better average daily gains when receiving daily supplements of 10 p.p.m. chlor- tetracycline. These data indicate that chlortetracycline exerts a growth- promoting effect in the absence of recognized swine disease, and has a growth-promoting effect in addition to that of lowering "disease level."

¹ Work supported by the Hormel Foundation and by a grant-in-aid from Lederle Laboratories Division of the American Cyanamid Company. Hormel Institute publication no. 129.

² With the technical assistance of Egis L. Warmanen.

³ Austin.