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《ACTA AGRICUL TURAE SHANGHAI》 1996-01
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EFFECTS OF RARE-EARTH ELEMENTS ON AVAILABILITY OF ENERGY AND AMINO ACIDS IN BROILERS

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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【Co-references】
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