Journal article

Publication year: 2002

Pages: 241-250

Journal: Archives of Poultry Science

Volume number: 66

Issue number: 6

ISSN: 0003-9098

URL: https://www.european-poultry-science.com/Studies-on-requirement-and-excess-of-valine-in-laying-hens,QUlEPTQ5NjA4MDQmTUlEPTE2MTAxNA.html?UID=65407ED45DC2B479C15AF9777FD676B3FFC5F38CA7C4F146

Publisher: Ulmer

Abstract: 
Three production trials and one N balance trial were conducted with Lohmann Brown hens to determine the requirement and excess of dietary valine in layers at different ages (24-32 and 46-54 weeks of age). The trials were designed as dose-response studies where valine-deficient basal rations with 11.4 MJ metabolizable energy per kg were supplemented with varying amounts of L-valine. In the production trials, the dietary valine concentrations ranged from 0.44 to 1.36%. Dose-response relationships were evaluated by linear (broken-line model) and non-linear (exponential) functions. Optimum (maximum in the broken-line model, 95% of maximum in the exponential function) daily egg mass, the average of the two models used, was reached at valine concentrations of 0.615% (Trial 1, 24-32 weeks of age, daily egg mass 50 g), 0.685% (Trial 2, 25-32 weeks of age, daily egg mass 58 g) and 0.585% (Trial 3, 46-52 weeks of age, daily egg mass 55 g), corresponding to daily valine intakes of 609, 782 and 651 mg, respectively. The valine concentrations required to achieve maximum feed consumption and body weight change were similar. In the N balance trial, maximum nitrogen retention in both egg and body were reached at a valine intake of 594 mg per hen per day. The valine requirement for maximum laying performance found in this study was lower than those reported by most of the studies reported elsewhere. Dietary valine concentrations up to 1.06% did not cause any depression in the laying performance of the hens. A dietary valine concentration of 1.36%, however, reduced feed consumption and daily egg mass by 5 to 10% compared with its maximum and caused a loss of body weight. The study shows that the margin between requirement and excess of valine is relatively wide in laying hens.

Harvard Citation style: Peganova, S. and Eder, K. (2002) Studies on requirement and excess of valine in laying hens, Archives of Poultry Science, 66(6), pp. 241-250. https://www.european-poultry-science.com/Studies-on-requirement-and-excess-of-valine-in-laying-hens,QUlEPTQ5NjA4MDQmTUlEPTE2MTAxNA.html?UID=65407ED45DC2B479C15AF9777FD676B3FFC5F38CA7C4F146

APA Citation style: Peganova, S., & Eder, K. (2002). Studies on requirement and excess of valine in laying hens. Archives of Poultry Science. 66(6), 241-250. https://www.european-poultry-science.com/Studies-on-requirement-and-excess-of-valine-in-laying-hens,QUlEPTQ5NjA4MDQmTUlEPTE2MTAxNA.html?UID=65407ED45DC2B479C15AF9777FD676B3FFC5F38CA7C4F146