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Effects of phytase and multicarbohydrase on growth performance, bone mineralization, and nutrient digestibility in broilers fed a nutritionally reduced diet
Journal of Applied Poultry Research ( IF 1.9 ) Pub Date : 2021-01-16 , DOI: 10.1016/j.japr.2021.100146
J. Wang , R. Patterson , W.K. Kim

An experiment was conducted to evaluate the effects of phytase and multicarbohydrase (MC) on growth performance, bone ash, and nutrient digestibility in broilers fed a nutritionally reduced diet. A total of 480 Cobb 500 male broilers were randomly allocated to 8 treatments with 6 replicates of 10 birds each. Experimental diets consisted of a positive control (PC); a negative control (NC) with the reduction of ME, CP, Ca, and nonphytate phosphorus by 75 kcal/kg, 1.5, 0.15, and 0.15%, respectively; NC plus phytase at 500, 1,000, or 1,500 FTU/kg as T3–T5; and further plus MC at 500 mg/kg as T6–T8. Results showed that during 0–18 d of age, feed conversion ratio (FCR) was increased (P < 0.05) in the NC group compared with the PC group; this was recovered (P < 0.05) in T5 group; BW gain (BWG) was increased (P < 0.05) in T6–T8, and FCR was decreased (P < 0.05) in T6 and T8, compared with the NC group. For bone mineralization, fat-free dry weight, weight, percentage, and concentration of tibia ash were decreased (P < 0.05) in the NC group compared with the PC group; T3–T5 increased (P < 0.05) tibia ash percentage and concentration, compared with the NC group, but only the tibia ash percentage reached to the level that of the PC group; T6–T8 increased (P < 0.05) tibia ash weight, percentage, and concentration compared with the NC group. Similarly, nitrogen retention and AMEn were decreased (P < 0.05) in the NC group and recovered in T3–T8; ileal P digestibility also was increased in T3–T8, to a greater level than that in the PC group. The results from contrasts suggested increasing phytase level with or without carbohydrase linearly increased broiler BWG, FCR, bone mineralization, N retention, and ileal P digestibility. Moreover, when combined with carbohydrase, increased phytase level in the diet linearly increased broiler energy utilization, while phytase alone showed no effect on AMEn. In conclusion, supplementation of a combination of phytase and MC could compensate the decreases in growth performance, bone ash, and nutrient digestibility caused by a nutritionally reduced diet.



中文翻译:

饲粮中低植酸酶和多糖合酶对肉鸡生长性能,骨矿化和营养消化率的影响

进行了一项实验,以评估植酸酶和多碳水化合物酶(MC)对饲喂营养减少饮食的肉鸡的生长性能,骨灰分和营养物质消化率的影响。总共将480头Cobb 500雄性肉鸡随机分配到8种处理中,每组10只鸡进行6次重复。实验饮食由阳性对照(PC)组成;阴性对照(NC),其ME,CP,Ca和非植酸磷分别降低75 kcal / kg,1.5、0.15和0.15%。T3–T5浓度为500、1,000或1,500 FTU / kg的NC加植酸酶;并进一步以500 mg / kg的MC含量作为T6-T8。结果表明,在0-18 d的年龄段中,饲料转化率(FCR)增加了(P NC组与PC组相比<0.05); T5组已恢复(P <0.05); 与NC组相比, T6-T8组的体重增加(BWG)增加(P <0.05),而T6和T8组的FCR降低(P <0.05)。对于骨矿化, NC组与PC组相比,无脂干重,胫骨灰分的重量,百分比和浓度降低(P <0.05); 与NC组相比,T3-T5增加了胫骨灰分的百分比和浓度(P <0.05),但只有胫骨灰分的百分比达到了PC组的水平。T6-T8增加(P <0.05)胫骨灰分的重量,百分比和浓度与NC组相比。同样,氮保留量和AMEn降低(P <0.05)在NC组中并在T3-T8中恢复;T3–T8回肠P的消化率也有所提高,高于PC组。对比结果表明,无论是否添加糖化酶,肌醇六磷酸酶水平的增加都会线性地提高肉鸡的BWG,FCR,骨矿化,氮保留和回肠磷的消化率。此外,当与碳水化合物酶结合使用时,日粮中植酸酶水平的增加线性地提高了肉鸡的能量利用率,而单独的植酸酶对AMEn没有影响。总之,补充植酸酶和MC可以弥补因饮食减少而导致的生长性能,骨灰分和营养消化率的下降。

更新日期:2021-02-17
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