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Effects of Protein Content of the Diet of the Young Pig on Rate and Efficiency of Gain during Early Development and Subsequent to 23.5 Kg., and Carcass Characteristics and Composition of Lean Tissue^{1, 2,}

University of Minnesota, St. Paul

Abstract

One hundred sixty-eight pigs weaned at 5.9 kg. were used in two experiments to determine the effects of 12, 15, 18, 21, 24 and 27% protein in corn-soybean meal diets fed until pigs averaged about 23.5 kg. on rate and efficiency of gain during the early developmental period and the growing period subsequent to 23.5 kg., and on carcass characteristics and composition of the lean tissue. All pigs were fed 15% protein diets during the period from 23.5 to 45.4 kg. and 12% protein diets during the final growing period. Two barrows and two gilts were slaughtered from each of four lots per initial treatment.

As expected, pigs fed 12 and 15% protein diets gained significantly (P<.01) slower and had significantly (P<.01) poorer gain/feed ratios during the period from 5.9 to about 23.5 kg. than pigs fed diets containing more protein. There were no significant effects of protein content of the diet fed during the early developmental period on rate of gain and gain/feed subsequent to 23.5 kilograms. Likewise, there were no significant effects on carcass characteristics or percentages of dry matter, protein and ether extract in the lean tissue from the l. dorsi.

¹ Paper No. 6662, Scientific Journal Series of the Minnesota Agricultural Experiment Station.

² Acknowledgement is due Elliott Packing Co., Duluth, Minn. and Swift & Co., South St. Paul, Minn., for excellent cooperation and assistance in obtaining carcass data; appreciation is expressed to American Cyanamid Co., Princeton, N. J., and Merck Sharp and Dohme, Rahway, N. J., for generous supplies of some dietary essentials.

³ NIH Trainee in Nutrition; supported by NIH Training Grant GMO 1041 from the National Institute of General Medical Sciences. Present address: Allied Mills, Inc., P.O. Box 459, Libertyville, Ill.

⁴ North Central Experiment Station, Grand Rapids, Minn.