摘要
用一日龄Arbor Acres雏鸡320只(1/2,1/2(?)),分成8组,分别喂以含锰(Mn)16ppm的玉米-豆饼基础饲粮和含Mn36、56、76、96、116、136和156ppm的添加Mn(试剂级MnSO_4·H_2O)饲粮28天,研究笼养肉仔鸡饲粮Mn的适宜水平。随饲粮Mn的提高,鸡体重在96ppm时增至最大(P>0.05),腿病发生率由57.5％(缺Mn基础组)逐渐降至10％以下(116ppm以上组);骨灰中Mn的含量呈线性上升(P<0.01),但肝、胰、肾、心、脾和肌肉中Mn的含量及心脏含Mn超氧化歧化酶(MnSOD)活性可与饲粮Mn含量拟合成相应的渐近线或二次曲线模式(P<0.01),当这些软组织Mn达到平衡和心MnSOD活性达最高时,计算所需的饲粮Mn分别为110、111、141、123、109、99和121ppm;肝和胰MnSOD无明显变化(P>0.05)。由上建议:AA肉仔鸡在0～4周龄饲粮中Mn含量以120ppm为宜,即为我国现行肉仔鸡Mn建议需要量60ppm的2倍。
An experiment was conducted using 320 day-old Arbor Acres(l/2 male, 1/2 female) to investigate the Mn optimal level of broilers fed a basal cornsoybean meal diet supplemented with reagent grade MnSO4· H2O in cages for 28 days. The basal diet contained 16ppm Mn and the experimental diets contained 36, 56, 76, 96, 116, 136 and 156ppm Mn. The chicks fed 96ppm Mn diet had the highest weight gain (P>0.05). Incidence of leg abnormality declined from 57.5% of the chicks fed the basal Mn deficient diet to below 10% of the chicks fed the diets containing 116ppm Mn or higher. Mn concentrations of liver, pancreas, kidney, heart, spleen and muscle, and Mn-containing superoxide dismut-ase(MnSOD) activity of heart were well fitted into the corresponding curve models(quadratic curves or asymptotes) with dietary Mn contents (P<0.001), while Mn concentration in bone ash was increased linearly (P<0.01). And dietary Mn contents required to reach the plateau of Mn concentrations of the above mentioned soft tissues and to obtain the maximum MnSOD activity of heart were calculated to be 110, 111, 141, 123, 109, 99 and 121ppm respectively. However, MnSOD of live and pancreas were not affected(P>0.05). For broilers fed this basal corn-soybean meal diet, 120ppm Mn is suggested as the satisfactory level, which doubles the presently recommended requirement.
出处
《畜牧兽医学报》
CAS
CSCD
北大核心
1991年第4期313-317,共5页
ACTA VETERINARIA ET ZOOTECHNICA SINICA
关键词
肉鸡
饲料
锰
适宜水平
鸡
仔鸡
Optimal Mn level, Tissue Mn concentrations, MnSOD activity, Broiler chicks
