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 Tanksley, T. D. Articles by Corley, J. R. Search for Related Content PubMed Articles by Tanksley, T. D., Jr. Articles by Corley, J. R.

Apparent Digestibility of Amino Acids and Nitrogen in Three Cottonseed Meals and one Soybean Meal¹

Texas Agricultural Experiment Station^,5, College Station 77843

Abstract

The digestibilities of amino acids and N in commercially-processed direct solvent (DS) and screwpress (SP) cottonseed meals, laboratory processed glandless (GL) cottonseed meal and 44% crude protein soybean meal (SBM) were determined at the end of the small intestine and over the total digestive tract of finishing pigs. The trial was conducted as a 4 x 4 Latin square with four littermate barrows fitted with simple T-cannulas approximately 15 cm proximal to the ileocecal valve. Ileal digesta were channeled out of the cannula by inflation of a 30-ml Foley catheter in the intestinal lumen caudal to the T-cannula. Digestibilities of N and the 10 essential amino acids (EAA) at the end of the small intestine and over the total digestive tract were higher (P<.05) with GL and SBM than with DS and SP. At the end of the small intestine, GL had higher (P<.05) N, arginine, methionine and valine digestibilities than did SBM, and SP had higher (P<.05) arginine and phenylalanine digestibilities than did DS. Over the total digestive tract GL had higher (P<.05) digestibilities of N, arginine, histidine, methionine, phenylalanine and valine than did SBM, and SP had higher (P<.05) digestibilities of all EAA, except lysine, methionine and tryptophan, than did DS. Lysine was the least digestible of the EAA in DS (61.7%) and SP (64.0%) at the end of the small intestine; in contrast, it was highly digestible in GL (88.5%) and SBM (87.1%). This wide difference indicates that diets containing commercial cottonseed meals may need higher total lysine levels to achieve the performance obtained with SBM-supplemented diets. A comparison of digestibilities at the end of the small intestine and over the total digestive track indicated a net loss of most amino acids in the large intestine.

¹ T.A. 16306, Texas Agr. Exp. Sta. This study was partially supported by the National Cottonseed Products Assoc, Memphis, TN.

² Present address: Central Soya, Decatur, IL.

³ Visiting professor from the Institute of Physiology and Digestion, Polish Academy of Sciences, Jablonna, Poland.

⁴ Present address: Ohio State Univ., Columbus.

⁵ Dept. of Anim. Sci.