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Protein and Fat Requirements of Baby Pigs^{1, 2,}

Iowa Agricultural Experiment Station⁵

Abstract

Four protein and four fat levels were studied in a 4x4 factorial experiment with 272 baby pigs fed dry-meal rations to determine the effect of protein and fat levels on gains and feed efficiency.

Response to protein levels (15, 20, 25 or 30%) for the first two-week test period showed a significant linear regression with maximum gains occurring on 30% protein. For the four-week test period, the observed gains when averaged across all fat levels (0, 2.5, 5.0 and 10%) reached a maximum on the 20% protein rations.

There was no significant difference in gains attributable to fat levels for either the first two-week or the four-week test period. However, when fat was added to the rations, the appearance of the pigs was improved. Fat also improved the physical characteristics of the ration.

Feed efficiency was significantly improved by increasing protein levels for both the first two-week and the four-week test periods. With increasing levels of fat, a significant linear decrease in feed efficiency occurred for the first two-week test period, but there was no significant difference in feed efficiency due to fat for the four-week test period.

¹ Journal Paper No. J-2964 of the Iowa Agricultural Experiment Station, Ames, Iowa. Project No. 959.

² From a portion of a thesis presented by E. R. Peo, Jr., to the Graduate College, Iowa State College, in partial fulfillment of the requirements for the Ph.D. degree, 1956.

³ Present address: Department of Animal Husbandry, University of Nebraska, Lincoln, Nebraska.

⁴ Present address: Department of Physics, Ontario Agricultural College, Guelph, Canada.

⁵ Department of Animal Husbandry. Acknowledgement is made to Mr. Don Quinn, Swine Nutrition Research Farm superintendent and his associates for their assistance.