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Effect of Protein Sequences on Performance and Carcass Characteristics of Growing-Finishing Swine^1,2,

The Ohio Agricultural Research and Development Center, Wooster, 44691 and The Ohio State University, Columbus, 43210

Abstract

The effects of three protein treatment sequences on performance and carcass characteristics of growing-finishing swine were examined. Four-hundred and four crossbred pigs (average initial weight 22 kg) were used in 10 replicates of an RCB design. One group received a 16-14.5–13% protein sequence, with diets changed at 36 and 59 kg body weight. The second group was fed a 16% protein diet from 22 to 54.4 kg, followed by a 13% diet to market weight. The third group received a 14.5% protein diet throughout the growing-finishing phase. Feed intake, gains and feed conversion for the overall period from 22 to 95 kg were similar for pigs on all three protein treatments, although rate of gain from 22 to 36 kg was slightly lower for those fed the constant 14.5% protein diet. Carcass characteristics were similar for all three groups. The results suggest that temporary moderate protein restrictions can be placed on pig diets without adversely affecting overall gains or carcass quality. Barrows gained faster than gilts but gilts had leaner carcasses, as indicated by lean cut percentage, backfat thickness and longissimus muscle area. Pigs housed in an open front facility gained more slowly and had higher feed intakes than pigs housed in complete confinement. No protein sequence x sex or protein sequence x location interaction on performance or carcass characteristics was evident throughout the study.

¹ Approved for publication as Journal article 80-80 of The Ohio Agr. Res. and Devel. Center, Wooster.

² Appreciation is expressed to J. Reed and T. Hartman for their help with collection of performance data, to P. G. Althouse for help with carcass evaluation and to Dr. J. Holman for statistical analysis.

³ Dept. of Anim. Sci., The Ohio Agr. Res. and Devel. Center, Wooster.