CAJ | 학술논문

本试验旨在通过研究维生素A对肉鸡生产性能、血清生化指标、器官指数及胫骨灰分含量的影响，确定饲粮适宜的维生素A添加水平。1日龄爱拔益加（ AA）肉仔鸡540只随机分为6组（每组3个重复，每重复30只），分别饲喂添加1500、3000、6000、9000、12000和15000 IU/kg维生素A的玉米-豆粕型饲粮，试验期28 d。结果表明：1）与添加6000 IU/kg维生素A相比，添加1500 IU/kg维生素A显著降低了存活率（ P＜0．05），添加15000 IU/kg维生素A显著降低了存活率和28日龄体重（P＜0．05），其他添加水平之间无显著差异（P＞0．05）。2）血清钙含量和碱性磷酸酶活性与维生素A添加水平均有显著的二次曲线关系（ P＜0．05），维生素A添加水平为6800 IU/kg时，血清钙含量最高，添加水平为10000 IU/kg时，血清碱性磷酸酶活性最低；与添加12000 IU/kg维生素A相比，添加1500和3000 IU/kg维生素A显著降低了血清磷含量（P＜0．05），其他添加水平之间无显著差异（P＞0．05）。3）肝脏指数和维生素A添加水平有显著的二次曲线关系（ P＜0．05），维生素A添加水平为8000 IU/kg时，肝脏指数最大；脾脏指数和维生素A添加水平有显著的一元线性关系（ P＜0．05），随维生素A添加水平的提高线性降低；与添加6000 IU/kg维生素A相比，添加1500 IU/kg维生素A显著降低法氏囊指数（P＜0．05），其他添加水平之间无显著差异（P＞0．05）。胫骨灰分含量各添加水平间没有显著差异（ P＞0．05）。由此可见：1）维生素A适宜的添加水平是6000～10000 IU/kg；2）血清碱性磷酸酶活性易受饲粮中维生素A添加水平的显著影响，不能准确反映骨骼的发育状况。
본시험지재통과연구유생소A대육계생산성능、혈청생화지표、기관지수급경골회분함량적영향，학정사량괄의적유생소A첨가수평。1일령애발익가（ AA）육자계540지수궤분위6조（매조3개중복，매중복30지），분별사위첨가1500、3000、6000、9000、12000화15000 IU/kg유생소A적옥미-두박형사량，시험기28 d。결과표명：1）여첨가6000 IU/kg유생소A상비，첨가1500 IU/kg유생소A현저강저료존활솔（ P＜0．05），첨가15000 IU/kg유생소A현저강저료존활솔화28일령체중（P＜0．05），기타첨가수평지간무현저차이（P＞0．05）。2）혈청개함량화감성린산매활성여유생소A첨가수평균유현저적이차곡선관계（ P＜0．05），유생소A첨가수평위6800 IU/kg시，혈청개함량최고，첨가수평위10000 IU/kg시，혈청감성린산매활성최저；여첨가12000 IU/kg유생소A상비，첨가1500화3000 IU/kg유생소A현저강저료혈청린함량（P＜0．05），기타첨가수평지간무현저차이（P＞0．05）。3）간장지수화유생소A첨가수평유현저적이차곡선관계（ P＜0．05），유생소A첨가수평위8000 IU/kg시，간장지수최대；비장지수화유생소A첨가수평유현저적일원선성관계（ P＜0．05），수유생소A첨가수평적제고선성강저；여첨가6000 IU/kg유생소A상비，첨가1500 IU/kg유생소A현저강저법씨낭지수（P＜0．05），기타첨가수평지간무현저차이（P＞0．05）。경골회분함량각첨가수평간몰유현저차이（ P＞0．05）。유차가견：1）유생소A괄의적첨가수평시6000～10000 IU/kg；2）혈청감성린산매활성역수사량중유생소A첨가수평적현저영향，불능준학반영골격적발육상황。
This experiment was conducted to study the effects of vitamin A on performance,serum biochemical indices,organ indices and tibia ash content of broilers and determine the appropriate vitamin A added level in diet. Five hundred and forty one-day-old Abor Aeres( AA)broilers were randomly allocated to 6 groups with 3 replicates per group and 30 chickens per replicate. The broilers were randomly fed one of six corn-soybean meal diets with different vitamin A added levels(1 500,3 000,6 000,9 000,12 000 and 15 000 IU/kg)for 28 d. The results indicated as follows:1)compared with 6 000 IU/kg vitamin A,added 1 500 IU/kg vitamin A significantly decreased livability( P<0.05),added 15 000 IU/kg vitamin A significantly decreased livability and body weight at 28 days of age( P<0.05),and other vitamin A levels did not cause distinct difference( P>0.05). 2)Quadratic responses to vitamin A added level were significant for serum calcium( Ca)content and serum alkaline phosphatase( ALP)activity of broilers( P<0.05),serum Ca content reached summit when vi-tamin A at 6 800 IU/kg,and serum ALP activity got to valley bottom when vitamin A at 10 000 IU/kg. Com-pared with 12 000 IU/kg vitamin A,added 1 500 and 3 000 IU/kg vitamin A significantly decreased serum phosphorus(P)content(P<0.05),and other vitamin A added levels did not cause distinct difference(P>0.05). 3)Liver index had a significant quadratic relationship with vitamin A added level( P<0. 05),and reached summit when vitamin A at 8 000 IU/kg. Spleen index had a significant linear relationship with vitamin A added level( P<0.05),and debased linearly with increased vitamin A added level. The bursa of Fabricius index of broilers fed 1 500 IU/kg vitamin A was significantly lower than that of broilers fed 6 000 IU/kg vita-min A(P<0.05),and had no significant differences with other groups(P>0.05). Tibia ash content had no significant differences among all groups( P>0.05). It follows that,1)suitable vitamin A added level in diet is from 6 000 to 10 000 IU/kg;2)serum ALP activity is affected easily by dietary vitamin A level and can not reflect bone develop status exactly.