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International Journal of Poultry Science

.: Home > International Journal of Poultry Science > 2009 > Volume 8 Number 4 > P. Gunawardana1, G. Wu1, Kun Yuan2, M.M. Bryant1 and D.A. Roland1, Sr

Effect of Dietary Energy on Performance, Egg Components, Egg Solids, Egg Quality and Profits in Seven Commercial Leghorn Strains During Second Cycle Phase Two

P. Gunawardana1, G. Wu1, Kun Yuan2, M.M. Bryant1 and D.A. Roland1, Sr
1Department of Poultry Science, Auburn University, Auburn, Alabama 36849, USA 2Department of Biological Sciences, Auburn University, Auburn, Alabama 36849, USA
Abstract :

This study was a 3 X 7 factorial arrangement with three dietary energy levels (low, medium and
high) and seven commercial Leghorn strains. The objective of this experiment was to determine the effect
of increasing dietary energy on performance, egg composition, egg solids, egg quality, and profits in seven
commercial Leghorn strains during second cycle phase 2 (from 88 to 97 week of age). This experiment
lasted 10 weeks. Seven strains of hens (n=245 of each strain) at 88 week of age were randomly divided into 21 treatments (6 replicates of 15 birds per treatment). Strain had a significant effect on feed intake, egg
production, egg specific gravity, egg weight, percent whole egg solids, and haugh unit. There were no
interactions between strain and dietary energy on any parameters during second cycle phase 2 (88 to 97
weeks of age). Dietary energy had no significant effect on any parameter. However as dietary energy
increased, egg production, final body weight of hens, egg mass, egg yolk color and egg yolk weight
numerically increased; moreover feed conversion numerically improved from 2.06 to 2.02, resulting in a
1.94% improvement of feed conversion. It is difficult to determine an ideal dietary energy level for the hens
in second cycle phase 2 because increasing dietary energy had no significant effect on feed intake, egg
mass and feed conversion. Because feed ingredient and egg price vary, there can be no fixed ideal dietary
energy requirement for optimal profits.

Keywords :
Strains, nutrient density, dietary energy, lysine

Date Deposited : 05 Jul 2011 11:14

Last Modified : 05 Jul 2011 11:14

Official URL: http://www.pjbs.org/ijps/ijps.htm

Volume 8, Number 4, - 2009 , ISSN 1682-8356

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