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Lu Kewen(Shanghai Shenjiang Feed Additive Factory, Shanghai 200232,China.)Yang Wenzhen(Dept. of Animal Science,Agr. College,Yangzhou University, Yangzhou 225009,China.)  
Two hundred seventy one-day-old commerical A. A. broilers were used to study the effects of rare-earth elements on growth of broilers. Fifty-four 29 day-old male chicks were used in metabolic test to study the effects of rare-earth elements on availability of energy,crude protein and amino acids. The results indicated that weight gain (P0. 05),feed conversion efficiency (P0. 05~0.01 ), energy availability(P0. 05~0. 01 )and crude protein availability (P0. 05)increased significantly when 20~80 mg·kg-1 rare-earth elements were added into the basal ration. When 20~160 mg·kg-1rare-earth elements were added,essential amino acids availability and total amino acids availability increased significantly (P0. 05~0. 01 ). Of all doses,40 mg· kg-1 was the best for the growth;weight gain (P 0. 05 ), feed conversion efficiency(P 0. 01 ), energy availability (P 0. 01 ), crude protein availability(P0. 05), essential amino acids availability (P0 . 05 ) and total amino acids availability (P0. 01 )rose by 8. 29%, 8. 43 %, 3. 80%, 7. 35 %, 3. 37 % and 4.27%,respectively.
【CateGory Index】: S831.5
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