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Effect of Feeding Rare Earth on Egg Production and Hatchability Broiler Growth  

Ham, S.K. (Dept. of Animal Resources and Biotechnology, The Institute of Rare Earth for Biological Application, Chonbuk National University)
Song, T.H. (Dept. of Animal Resources and Biotechnology, The Institute of Rare Earth for Biological Application, Chonbuk National University)
Zhang, G.Q. (Dept. of Animal Resources and Biotechnology, The Institute of Rare Earth for Biological Application, Chonbuk National University)
Hur, S.N. (Dept. of Animal Resources and Biotechnology, The Institute of Rare Earth for Biological Application, Chonbuk National University)
Park, H.S. (Dept. of Animal Resources and Biotechnology, The Institute of Rare Earth for Biological Application, Chonbuk National University)
Publication Information
Korean Journal of Poultry Science / v.33, no.3, 2006 , pp. 225-231 More about this Journal
Abstract
To investigate the effect of feeding rare earth (RE) on the performance of breeder hens a feeding trial with sixteen thousands of 158 day old Ross broiler breeder hens was conducted for thirty weeks. A mixture of RE- chlorides containing mainly La, Ce, and Pr was mixed into corn-soy based diet at two levels, 300 and 600 mg/kg, All the hens were housed in flat layer houses and the ratio of male to female was maintained at one to ten. Dietary supplementation of the of RE at a level of 300 mg/kg made the hens reach egg production peak higher by about 6% and earlier by about two weeks. As a result, it made higher hatchable egg production by 3.5%. It also reduced dramatically the mortality of both male and female breeders(P<0.05). Egg weight was slightly increased but egg qualify was not much influenced by dietary supplementation of RE. Egg albumin hight and Haugh unit were significantly improved while egg shell thickness, egg breaking strength and yolk color were similar to those of the control. Experimental results appeared to show a good possibility that egg fertility and hatchability were improved by feeding RE. Dietary supplementation of RE at a level of 300 mg/kg should be acceptable but not the 600 mg/kg level for breeder hens. Further studies on the effect of RE on egg fertility and hatchability appears to be necessary.
Keywords
rare earth; breeder hen; hatchability; egg qualify;
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