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The Effect of the Plane of Nutrition on the Carcass Quality of a Line of Swine based on a Chester White and Danish Landrace Cross¹

The State College of Washington

Abstract

Limiting the feed intake of swine to 70 percent of full feed until the animals reach 150 pounds, did not affect the body measurements at that weight. The number of days required to reach 150 pounds was significantly greater between levels of feeding within generations.

The carcass qualities of swine can be changed by limiting the feed intake to 70 percent of full feed up to 150 pounds and full feeding from then on until the animal reaches approximately 220 pounds live weight, as indicated by a significantly higher percentage of the total five trimmed primal cuts and lower percentage of total lard produced by the L.H. line. The L.H. produced a leaner carcass.

The F₂ H.H. had a longer carcass than the F₁ H.H. but did not differ in average thickness of backfat from it. The F₂ L.H. also had a longer carcass and the average thickness of backfat was slightly greater than the F₁ H.H.

¹ Published as Scientific Paper No. 904 Agricultural Experiment Station, Institute of Agricultural Sciences, The State College of Washington. This is the first of a series of reports of a project entitled, "A Fundamental Study of the Relationship Between Nutrition and the Improvement of Animals for Meat Production Through Breeding." This study was conceived and initiated by Dr. E. J. Warwick in 1947 and was supported in part by grants from Swift & Co., Chicago, Illinois; American Dry Milk Institute, Inc., Chicago, Illinois; Carstens Packing Co., Tacoma and Spokane, Washington; Gibson Packing Company, Yakima, Washington; Hiram Walker, Peoria, Illinois, and Standard Brand, Inc., New York, New York.

The advisory committee to the project consists of: Dr. H. H. Brugman, Assistant Professor of Animal Husbandry, Assistant Animal Husbandman, The State College of Washington; Dr. M. E. Ensminger, Chairman of the Department of Animal Husbandry, The State College of Washington; Dr. S. P. Swenson, Dean of the College of Agriculture, The State College of Washington; Dr. H. E. Robinson, Assistant Director of Research, Swift & Co., Chicago, Illinois; Dr. R. T. Clark, National Coordinator Beef Cattie Research, Room 530, New Customhouse, Denver 2, Colorado; Dr. E. J. Warwick, Regional Coordinator S-10, Beef Cattle Breeding, 110 McCord Hall, University of Tennessee, Knoxville 16, Tenn.; Mr. W. F. Wilhelm, President of the Washington Swine Breeders Association, Rosalia, Washington.