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 Misir, R. Articles by Cichon, R. Search for Related Content PubMed Articles by Misir, R. Articles by Cichon, R.

Chemical Composition and Protein Quality Evaluation of High Lysine Barleys Fed to Growing Rats and Pigs¹

University of Alberta, Edmonton, Alberta, Canada T6G 2P5

Abstract

Two established high lysine barleys, Hiproly and Risø 1508 and one experimental high lysine barley test line (Line 6), all grown in Alberta under similar soil and environmental conditions were evaluated as sole protein sources in one rat and one pig experiment. As compared with Gait (a normal control barley), crude protein (N x 6.25) contents were 67, 47 and 16% higher in Hiproly, Line 6 and Risø 1508, respectively. The lysine content (percentage) in the grain and the percentage increase relative to Gait were Hiproly (.72, 80%), Risø 1508 (.71, 78%) and Line 6 (.58, 45%), respectively. In the rat trial, relative protein values (RPV) expressed as percentages of that of Gait, were 115, 109 and 108 for Line 6, Hiproly and Riso 1508, respectively. In the pig trial, mean N retention (as a percentage of N intake) was similar for Hiproly, Risø 1508 and Line 6 (42.6 to 43.5), but higher (P<.01) than for Galt (32.5). Apparent biological value (percentage) was lowest (P<.01) for Galt (50.4) and highest for Risø 1508 (66.0), but not significantly different (P>.05) from that of Hiproly (57.8) or Line 6 (58.7). The high biological value of Risø 1508, despite the low true digestibility of N was directly related to the amount (g) of lysine available for absorption by the pig. It is concluded that Albertagrown high lysine barleys are nutritionally superior to a normal control barley. The use of rats as assay animals may provide valuable data on protein quality of test barley lines for growing pigs.

¹ The authors are grateful for financial support from the Agricultural Research Council of Alberta (Farming for the Future) and the Alberta Agricultural Research Trust. Samples of Barley Geneticist, Alberta Agriculture, Lacombe, Canada.

² Present Address: Prairie Swine Centre, Dept. of Anim. and Poul. Sci., Univ. of Saskatchewan, Saskatchewan, Canada S7N 0W0.

³ Dept. of Anim. Sci.; to whom requests for reprints should be addressed.

⁴ Postdoctoral Fellow, Institute of Food Biotechnology, Univ. of Agriculture, Olsztyn, Poland.