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Effect of Space Allowance and Tylosin Feeding on Performance of Growing-Finishing Pigs^1,2,

Iowa Agriculture and Home Economics Experiment Station, Ames 50011

Abstract

The relationship between space allowance and tylosin feeding of growing-finishing pigs was investigated at nine experiment stations in the North Central Region. The experiment involved 1,352 pigs in 23 replications of treatments. Pigs allowed .46 m² from 25 to 57 kg body weight and .74 m² from 57 to 96 kg grew faster in the grower (P<.001), finisher (P<.05) and grower-finisher (P<.001) periods than did pigs allowed .32 m² and .56 m² for the two weight periods, respectively. Feed efficiency was improved (P<.005) by the more liberal space allowance in the grower, but not in the finisher period. Tylosin at 44 mg/kg changed to 22 mg/kg at 57 kg body weight caused an increase (P=.07) in rate of gain for the overall grower-finisher period and an improvement in feed efficiency in the grower (P=.07) and the grower-finisher (P<.05) periods. In no instance was there an interaction between space allowance and tylosin feeding. Station effects were signficant for all performance estimates, but there were no interactions between station and space-tylosin treatments. The results of the experiment indicate that crowding depressed performance of growing-finishing pigs, that tylosin feeding slightly improved performance and that the space allowance and the tylosin growth responses were independent.

¹ Journal Paper No. J-11362 of the Iowa Agr. and Home Econ. Exp. Sta., Ames. Project No. 2356.

² This study was supported in part by grant-in-aid from the Elanco Products Co., Indianapolis, IN.

³ The Committee during the study included: R. Arthur, Southern Illinois Univ.; M. C. Brumm, Univ. of Nebraska; R. Christenson, U. S. Meat Anim. Res. Center; S. E. Curtis, Univ. of Illinois; R. H. Hines, Kansas State Univ.; M. Hogberg, Michigan State Univ.; G. W. Jesse, Univ. of Missouri; J. N. Johnson, North Dakota State Univ.; H. W. Jones, Purdue Univ.; K. W. Kelley, Washington State Univ.; V. Leibbrandt, Univ. of Wisconsin; G. W. Libal, South Dakota State Univ.; R. L. Moser, Univ. of Minnesota; R. F. Wilson, Ohio State Univ.; R. L. Witz, North Dakota State Univ.; D. R. Zimmerman, Iowa State Univ. The administrative advisor was B. R. Baumgardt, Purdue Univ.

⁴ Manuscript prepared by D. R. Zimmerman.