J. Anim Sci.
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J. Anim Sci. 1965. 24:1020-1026.
© 1965 American Society of Animal Science
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Response of Pigs and Rats to Rations Supplemented with Tylosin and High Levels of Copper1

R. M. Beames2 and L. E. Lloyd

Macdonald College (Mcgill University)3, Province of Quebec, Canada

Abstract

Ninety-six 3-week-old pigs and sixty-four 4-week-old rats, divided equally as to sex were used to measure the effect of adding tylosin tartrate and a high level of copper to rations containing two levels of soybean meal. The basal rations, containing 6% and 23% soybean meal, were formulated to contain approximately 25% crude protein. Each ration was fed without supplement, with copper (250 ppm) as copper sulfate, with tylosin tartrate (110 ppm) and with both copper and antibiotic. The pigs were fed for 6 weeks and the rats for 4 weeks.

In both species tylosin increased gains and feed intake on both rations, but copper increased gains on the 6% soybean meal ration only. In general, tylosin reduced the apparent digestibility of organic matter and total carbohydrate, but improved the apparent digestibility of crude protein. Copper had little effect on digestibility coefficients. On both rations copper supplementation increased the liver copper levels of pigs, but had no effect on the level of copper in the liver of rats.

Footnotes

1 This research was assisted financially by the Quebec Agricultural Research Council.

2 Data reported here were taken from a thesis submitted the senior author in partial fulfillment of the requirements for the Ph.D. degree. Present address: Animal Research Institute, Yeerongpilly, Queensland, Australia.

3 Department of Animal Science.






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Copyright © 1965 by the American Society of Animal Science.