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http://dx.doi.org/10.5187/JAST.2003.45.3.369

Exploiting the Maximum Productive Potential of Spent Laying Hens with Various Metabolizable Energy and Protein Levels after Induced Molting  

Akram, M. (Department of Poultry Husbandry, University of Agriculture)
Park, J. H. (Dept. of Animal Resources and Biotechnology Chonbuk National University)
Ryu, M. S. (Dept. of Animal Resources and Biotechnology Chonbuk National University)
Shin, K.H. (Dept. of Animal Resources and Biotechnology Chonbuk National University)
Ryu, K. S. (Research Center for Industrial Developement of Biofood Materiasl, Chonbuk National University)
Publication Information
Journal of Animal Science and Technology / v.45, no.3, 2003 , pp. 369-376 More about this Journal
Abstract
This experiment was conducted to investigate the influence of different levels of metabolizable energy (ME) and crude protein (CP) on post-molt performance and egg quality of spent laying hens. Four hundred and thirty two, ISA Brown hens at sixty six weeks of age after molt induction were fed six experimental diets containing three ME (2,750, 2,800, 2,850 kcal/kg) with two CP (15, 17%) levels in a factorial design. The influence of ME and CP were evaluated on egg production, egg weight and feed intake throughout 24 weeks of production. Egg mass and feed conversion ratio (FCR) were measured during the experimental period. Haugh unit, yolk color and eggshell breaking strength were measured at 5%, 50%, peak, post peak and end stage of egg production. The hens fed 2800 kcal/kg diet along with 15% CP recorded the highest outcome of egg production (P<0.05). The egg weight has been shown to increase with hens receiving 2,800 kcal/kg ME. Daily egg mass tended to increase in hens fed with 15% CP and 2,800 kcal/kg ME. Feed intake decreased significantly with the level of ME and CP in the diet increased (P<0.05). Yolk color was improved significantly in eggs laid by the hens receiving 17% CP than 15% diet. It also tended to be higher in 17% CP with 2,800 or 2,850 kcal/kg ME diet treatments. Egg shell breaking strength increased with hens receiving diets of 15% CP and 2,800 kcal/kg. From this experiment it can be concluded that the ME level of 2,800 kcal/kg coupled with 15% CP could be used to achieve the higher egg production and better eggshell strength in induced molting hens.
Keywords
Induced molting; Laying hens; Egg production; CP; ME;
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