Sparrows discriminate between diets differing in valine or lysine concentrations

Physiology & Behavior
M E Murphy, J R King

Abstract

White-crowned Sparrows (WCS) were given free access to pairs of semisynthetic diets that were either adequate or subadequate (25% of requirement) in valine or lysine. Within 2 to 4 days WCS chose a ratio of the paired diets that allowed them to maintain body mass or restore any losses quickly. On the initial choice days the birds transiently reduced total daily food intake (TDFI) roughly in proportion to their intake of the subadequate diet. The initial decrease of TDFI was greater and the latency in choosing an effective ratio of the paired diets was 2-3 days longer with valine than with lysine diets in well-nourished test birds. In malnourished birds fed only the subadequate test diet for 3 days, valine-deficient birds increased TDFI and body mass more promptly than did lysine-deficient birds when offered a choice of adequate and subadequate diets. The form of the test amino acid (CAA = crystalline, PB = protein-bound) had little effect on choice behavior, but sudden transfer of WCS from a PB acclimation diet to test diets with a large total CAA concentration increased the latency of effective choice by 2-3 days. A brief acclimation (2-3 days) to a CAA diet precludes any bias between nutritionally equivalent CAA and PB diets....Continue Reading

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Citations

Jul 20, 2010·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·H BattamW A Buttemer
Jan 1, 1993·Physiology & Behavior·R D Richardson, T Boswell
Apr 1, 1993·Physiology & Behavior·M E Murphy, S D Pearcy
Nov 4, 2015·Cell Reports·David E Leib, Zachary A Knight
Sep 10, 2009·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Astolfo MataYvon Le Maho
Feb 20, 1999·The Journal of Nutrition·B J HrupkaQ R Rogers

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