J. Anim Sci.
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J. Anim Sci. 1969. 28:197-203.
© 1969 American Society of Animal Science
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Response of Swine Selected for High and Low Fatness to a Difference in Dietary Energy Intake1

R. J. Davey, D. P. Morgan and C. M. Kincaid

U. S. Department of Agriculture3

Abstract

One hundred twenty-eight pigs were used in a balanced 24 x 8 factorial experiment in which the two-level factors were year, breed (Yorkshire and Duroc), line (high- and low-fat) and diet (normal and 25% reduction in gross energy intake). The pigs were slaughtered at eight ages from 84 to 392 days. The high-fat line gained 8 and 16% slower than the low-fat line in the Yorkshires and Durocs, respectively. There was an over-all 20% reduction in rate of gain and a 4% improvement in feed efficiency when energy intake was reduced. There was a significant breed x line x diet effect on rate of gain as a result of the variable, within line response to energy restriction.

Average carcass and fat weights were heavier (P<.01) for Durocs than Yorkshires and the reverse was true for weight of lean and bone. Low-fat lines had more total lean and bone and less fat than high-fat lines. There were average decreases of 34% in fat weight and 7% in weight of lean and bone because of dietary energy restriction. This restriction resulted in changes of +4, –12, –10 and –9% in weight of lean for high-fat and low-fat Yorkshires and high-fat and low-fat Durocs, respectively.

Footnotes

1 The statistical analyses of the data were conducted under the supervision of R. P. Lehmann, Biometrical Services, A.R S. U.S.D.A., Beltsville, Maryland.

3 Animal Husbandry Research Division, A.R.S., Beltsville, Maryland.






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