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Asian Journal of Poultry Science
Year: 2014  |  Volume: 8  |  Issue: 3  |  Page No.: 75 - 81

Some Productive, Egg Quality and Serum Metabolic Profile Responses Due to L-threonine Supplementation to Laying Hen Diets

A.A.A. Abdel- Wareth and Z.S.H. Esmail    

Abstract: This study evaluated the effects of different levels of L-threonine on some productive performances, egg quality and serum metabolic profile of the late laying period. A total of one hundred and twenty Hy-Line Brown laying hens (68-week-old), were assigned to the basal control diet or the basal diet supplemented with 0.2, 0.4 and 0.6% of L-threonine (n = 6 per diet, each replicate consists of 5 birds). Production performance was measured for 8 weeks and egg quality characteristics and blood parameters were determined at 76 weeks of age. Hy-Line Brown laying hens showed significantly linear and quadric (p<0.01) responseon egg production, egg weight and egg mass. Feed intake increased linearly and quadrically (p<0.001) with the increasing levels of L-threonine. Feed Conversion Ratio (FCR) significantly decreased with the increasing L-threonine in the laying diets. The level of 0.4% L-threonine resulted in overall best performance. No differences were observed for shell percentage, shell thickness and albumin height among the treatments. However there were significant quadratic response (p = 0.028) on Haugh Unit (HU) among treatments. Serum cholesterol decreased linearly (p<0.001) and quadrically (p = 0.032) with supplemental threonine levels. Serum glucose significantly increased (p<0.002) with increased L-threonine, whereas no changes were observed on serum calcium and phosphorus. It could be stated that L-threonine used in this study had beneficial effects on productive and HU as well as to decrease serum cholesterol. The threonine level of 0.4% gives the best result than other levels and this threonine level could be recommendable during late laying period.

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