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Effect of dietary supplementation with licorice extract on certain egg quality traits of white leghorn hens | ||
| iraqi poultry sciences journal | ||
| Article 1, Volume 2, Issue 2, 2007, Pages 32-45 | ||
| Authors | ||
| M. H. M. Ameen; H. J. Al- Daraji | ||
| Abstract | ||
| This experiment was conducted at the Poultry Farm of Animal Resources Department, College of Agriculture, University of Baghdad during the period from 1/10/2005 to 1/4/2006, to investigate the effect of dietary supplementation with different levels of licorice extract on egg quality traits of White Leghorn hens. A total of 90 females, 34 weeks of age were used. The birds were allocated to 3 treatments of 3 replicates per group; each replicate constitutes 10 birds, 30 birds per group. Licorice extract was added to the diet during the whole period of experiment which lasted 20 weeks at levels of 0 (T1), 500 (T2), and 750 mg /kg of feed (T3). The traits included in this experiment were: Yolk height, albumin height, yolk diameter, yolk weight, albumin weight, shell weight, shell thickness, egg specific gravity and Haugh unit. Results of this experiment revealed that the addition of licorice extract to the hens' diet resulted in significant improvement in yolk weight, albumen weight, shell weight, shell thickness and Haugh unit during the most of weeks of experiment and significant amelioration in accumulative yolk weight, accumulative shell weight, accumulative shell thickness, accumulative albumen weight and accumulative Haugh unit. Results also indicated that there were no significant differences between experimental treatments as regards yolk height, accumulative yolk height, albumin height, accumulative albumen height, yolk diameter, accumulative yolk diameter, egg specific gravity and accumulative egg specific gravity in spite of that there was clear trend for the increase in licorice treatments with respect to all these traits in comparison with control group. | ||
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