Index Selection and Feed Intake Restriction in Swine, II: Effect on Energy Utilization

Authors

Erik R. Cleveland, University of Nebraska-Lincoln
R. K. Johnson, University of Nebraska-LincolnFollow
R. W. Mandigo, University of Nebraska-LincolnFollow
E. R. Peo Jr., University of Nebraska-Lincoln

Document Type

Article

Date of this Version

3-1-1983

Citation

Journal of Animal Science (1983) 56(3)

Comments

Copyright 1983, American Society of Animal Science. Used by permission

Abstract

Fifty-three index select and control line barrows were randomly assigned to three feeding levels at 83 d of age. They were slaughtered at approximately 188 d of age to determine the effects of index selection (for increased average daily gain and decreased backfat) and level of feed intake on energy utilization. During the trial, the feed intake levels were twice daily to appetite (AP), once daily feeding of 91% of appetite (AP91) or once daily feeding of 82% of appetite (AP82) intake. The metabolizable energy intake required per kilogram of edible lean deposited (Mcal/kg) was reduced (P.75)^-1 x day ^-1, but the difference was less when expressed unit of lean (kg^.83)^-1x day^-1. The energy cost of protein deposition varied from 9.02 to 11.25 kcal/g, while the energy cost of fat deposition ranged from 12.73 to 12.86 kcal/g. Variation among animals in metabolizable energy intake was explained by variation in lean mass maintained and the quantity of protein and fat deposited.