HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Pond, W. G. Articles by Yen, J.-T. Search for Related Content PubMed PubMed Citation Articles by Pond, W. G. Articles by Yen, J.-T.

Effect of Protein Deficiency on Growth and Plasma Zinc Concentration in Genetically Lean and Obese Swine

US Department of Agriculture, Clay Center, NE 68933^,2

Abstract

Thirty-two genetically lean and 32 genetically obese weanling (4 to 5 wk old) pigs from inter se matings of crossbreds produced by within-line matings of Duroc and Yorkshire breeds, selected for low or high backfat, were fed the following four diets for 8 wk (eight lean and eight obese pigs/diet): 10% protein 100 ppm Zn, 10% protein 200 ppm Zn, 18% protein 100 ppm Zn, 18% protein 200 ppm Zn. After 8 wk, all pigs were fed a standard 16% protein corn-soybean meal-type growing diet to a slaughter weight of about 87 kg. Lean pigs were more severely affected than obese pigs by low protein diets as measured by weight gain, plasma total protein and plasma albumin. Plasma Zn concentration was reduced in lean and obese pigs fed low protein diets. Supplemental Zn failed to increase plasma Zn in protein-deficient pigs. During repletion, weight gain of lean and obese pigs previously fed the 10% protein 100 ppm Zn diet was less than that of pigs previously fed other diets. The lower level (100 ppm) of Zn fed during protein depletion appeared to be associated with a negative effect on repletion weight gain of lean and obese pigs. Lean and obese pigs responded similarly during the repletion phase to earlier protein restriction. We conclude that supplementary dietary Zn does not maintain plasma Zn concentration in growing pigs fed protein-deficient diets and that repletion from dietary protein restriction is not associated with compensatory growth in genetically lean pigs.

¹ We thank M. D. MacNeil for statistical advice; R. N. Lindvall and associates, especially Leola Lansford and Jenell Dague, for animal care and feeding; Lei H. Yen and Jeff Waechter and associates for blood and feed analyses; Nancy K. Cook and associates for slaughter and carcass data and Sherry Hansen for stenographic work.

² Roman L. Hruska US Meat Animal Research Center, Agricultural Research Service.

This article has been cited by other articles:

				J. Fabian, L. I. Chiba, D. L. Kuhlers, L. T. Frobish, K. Nadarajah, C. R. Kerth, W. H. McElhenney, and A. J. Lewis Degree of amino acid restrictions during the grower phase and compensatory growth in pigs selected for lean growth efficiency J Anim Sci, October 1, 2002; 80(10): 2610 - 2618. [Abstract] [Full Text] [PDF]