Boucque C V, Fiems L O, Cottyn B G, Buysse F X
National Institute for Animal Nutrition, Government Agricultural Research Centre-Ghent, Melle-Gontrode, Belgium.
Arch Tierernahr. 1988 Nov;38(11):995-1003. doi: 10.1080/17450398809432942.
117 white-red beef bulls were involved to investigate the effect of lasalocid-sodium when fed either during the grazing period, or the finishing period, or during both subsequent periods. The ionophore was fed at 250 mg daily per head incorporated in 1 kg dry sugar beet pulp on pasture and at 65 mg per kg concentrate afterwards (corresponding with 27 ppm in the ration DM). The finishing diet consisted of maize silage ad libitum and 0.75 kg concentrate per 100 kg liveweight per day. On pasture lasalocid significantly increased daily gain form 0.6 to more than 0.7 kg, without affecting the grazed area per animal. During the finishing period growth rate was only slightly affected by lasalocid, but feed intake was reduced (P less than 0.05) and feed conversion improved (P less than 0.05). Feeding lasalocid permanently for more than 400 days did not reduce these positive effects. Cumulative daily gain, total feed intake per head and feed conversion were 1.12 kg, 2176 kg dry matter (DM) and 4.70 kg DM. These figures amounted to 1.05 kg, 2283 kg DM and 5.16 kg DM when no lasalocid was fed; 1.06 kg, 2141 kg DM and 4.87 kg DM when lasalocid was only fed during the finishing period and 1.09 kg, 2246 DM and 4.99 kg DM when lasalocid was only fed during the grazing period. Daily gains of 1.05 and 1.06 kg were significantly lower (P less than 0.05) than 1.12 kg. Most carcass data were unaffected, except fatness. The permanent feeding of lasalocid increased carcass fatness, mainly as the result of a higher final weight.
117头白红相间的肉用公牛参与了一项研究，以调查在放牧期、育肥期或两个后续时期都饲喂拉沙洛西钠的效果。离子载体以每头每天250毫克的剂量添加到1千克干甜菜渣中，在牧场时饲喂，之后以每千克浓缩饲料65毫克的剂量添加（相当于日粮干物质中27 ppm）。育肥日粮包括随意采食的玉米青贮饲料和每100千克活重每天0.75千克的浓缩饲料。在牧场时，拉沙洛西钠显著提高了日增重，从0.6千克提高到超过0.7千克，且不影响每头动物的放牧面积。在育肥期，生长速度仅受到拉沙洛西钠的轻微影响，但采食量减少（P<0.05），饲料转化率提高（P<0.05）。连续400多天饲喂拉沙洛西钠并没有降低这些积极效果。累积日增重、每头总采食量和饲料转化率分别为1.12千克、2176千克干物质（DM）和4.70千克DM。不饲喂拉沙洛西钠时，这些数字分别为1.05千克、2283千克DM和5.16千克DM；仅在育肥期饲喂拉沙洛西钠时，分别为1.06千克、2141千克DM和4.87千克DM；仅在放牧期饲喂拉沙洛西钠时，分别为1.09千克、2246千克DM和4.99千克DM。1.05千克和1.06千克的日增重显著低于1.12千克（P<0.05）。除了脂肪含量外，大多数胴体数据不受影响。长期饲喂拉沙洛西钠增加了胴体脂肪含量，主要是由于最终体重较高。
