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 Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Veum, T. L. Articles by Hedrick, H. B. Search for Related Content PubMed Articles by Veum, T. L. Articles by Hedrick, H. B.

Opaque-2 and Normal Corn as Amino Acid Sources for Barrows and Gilts ^{1, 2,}

University of Missouri, Columbia 65201

Abstract

Opaque-2 and normal corn were compared as amino acid sources for 58 crossbred barrows and gilts from 26 to 94 kilograms. Pigs fed the normal corn-soybean meal diet (14% protein) had a greater average daily gain (ADG) and daily feed intake than did pigs fed the opaque-2 corn-soybean meal diet (14% protein). The amino acid content of both diets was similar although the normal corn-soybean meal diet contained more lysine and aspartic acid. In contrast, pigs fed the opaque-2 corn supplemented with lysine, methionine and tryptophan had a greater gain/feed and ADG than the pigs fed normal corn supplemented with lysine, methionine and tryptophan to meet the N.R.C. (1968) requirements of swine from 20 to 35 kilograms.

The type of corn or amino acids supplement fed had no significant (P<.05) effect on carcass measurements. Pigs fed the normal corn-soybean meal diet had larger longissimus muscle areas than pigs fed the normal corn diet supplemented with lysine, methionine and tryptophan. Pigs that received diets supplemented with soybean meal tended to produce meatier carcasses compared to pigs that received diets supplemented with amino acids. The gilts produced carcasses with larger longissimus muscle areas, less backfat and a higher percentage of lean cuts than the barrows, although the ADG of the barrows exceeded that of the gilts.

Nonfasted and fasted plasma amino acid levels at 54 and 94 kilograms, respectively, are discussed. Plasma amino acid levels confirm the composition analyses which indicated that the diets supplemented with lysine, methionine and tryptophan were deficient in isoleucine and borderline to deficient in threonine and possibly valine.

¹ Contribution from the Missouri Agricultural Experiment Station. Journal Series Number 6450.

² The opaque-2 corn was kindly supplied by Dr. Dean Stanley and Mr. Monroe Howell, Northrup King Inc., Washington, Iowa; the L-lysine by Dr. Laurent Michaud, Merck Sharp and Dohme; and the D-L methionine by Dr. Maxwell L. Cooley, Hoffman-Taft, Inc. Appreciation is extended to Torn Davison and Merrill Schmidt for assistance in caring for the animals and collection of the data and Dr. C. W. Gehrke for proximate and amino acid analyses.

³ Animal Husbandry Department.

⁴ Present address: Farm and Home Administration, Eldon, Missouri.

⁵ Food Science and Nutrition Department.