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A study of solely used phytase or in combination with multi-carbohydrase on growth performance along with tibia mineralization, and carcass traits in broilers fed nutrient-deficient diets
Journal of Animal Science ( IF 2.7 ) Pub Date : 2024-10-05 , DOI: 10.1093/jas/skae299
Bernadette G Sta. Cruz, Myunghwan Yu, Elijah O Oketch, Shan R Nawarathne, Nuwan C Chathuranga, Venuste Maniraguha, Eunsoo Seo, Jeseok Lee, Haeeun Park, Hyungjung Yun, Dohoon Lee, Jung Min Heo

The objective of this study aimed to investigate the effectiveness of phytase alone and in combination with multi-carbohydrase in available phosphorus (AP) and energy-deficient diets on growth performance, nutrient digestibility, tibia traits, and carcass quality of broilers. A total of 288 one-day-old Ross 308 broiler chicks were randomly assigned to one of six dietary treatments in a completely randomized design, with each treatment having 6 replicates and 8 birds per cage. The treatments were as follows: i) positive control with adequate nutrition (PC); ii) 0.20% AP-deficient diet without phytase (NC-1); iii) 0.25% AP-deficient diet without phytase (NC-2); iv) NC-1 diet plus 500 FTU/kg phytase (NCP-1); v) NC-2 diet plus 750 FTU/kg phytase (NCP-2); and vi) NC-2 with 100 kcal/kg ME deficient diet plus 1,000 FTU/kg phytase and multi-carbohydrase: 2,200 U/kg galactomannanase, 30,000 U/kg xylanase, 22,000 U/kg β-glucanase, and 700 U/kg α-galactosidase (NCPM). Broilers in the PC group and those fed enzyme-supplemented diets exhibited greater (P < 0.05) growth performance in terms of body weight (BW), average daily gain (ADG), and feed conversion ratio (FCR), along with enhanced tibia mineralization through the ash, calcium (Ca), phosphorus (P) composition, and tibia breaking strength compared to NC diets throughout the study. Among the treatments, broilers assigned to the NCPM group showed greater (P < 0.05) levels of energy and P digestibility on days 21 and 35. Concerning carcass characteristics, the leg meat yield was greater (P < 0.05) in broilers fed the NCP-2 diet compared to all other treatments on days 21 and 35. Supplementation of phytase at doses of 500 FTU/kg and 750 FTU/kg effectively recovers AP deficiencies of 0.20% and 0.25%, respectively, in broiler diets without compromising the growth performance of broilers. Additionally, combining multi-carbohydrase and phytase led to AP and energy loss recovery, which improved tibia mineralization and nutrient digestibility through their synergistic interaction.

中文翻译:


单独使用植酸酶或与多碳水化合物酶联合使用对饲喂营养缺乏日粮的肉鸡生长性能、胫骨矿化和胴体性状的研究



本研究的目的是调查植酸酶单独使用和与多种碳水化合物酶联合使用在有效磷 (AP) 和能量缺乏日粮中对肉鸡生长性能、营养消化率、胫骨性状和胴体质量的有效性。共有 288 只一日龄 Ross 308 肉鸡雏鸡被随机分配到完全随机设计的 6 种日粮处理中的一种,每次处理有 6 个重复,每个笼 8 只鸡。处理如下: i) 营养充足 (PC) 阳性对照;ii) 不含植酸酶的 0.20% AP 缺陷日粮 (NC-1);iii) 不含植酸酶的 0.25% AP 缺陷日粮 (NC-2);iv) NC-1 饮食加 500 FTU/kg 植酸酶 (NCP-1);v) NC-2 饮食加 750 FTU/kg 植酸酶 (NCP-2);vi) NC-2 与 100 kcal/kg ME 缺乏饮食加 1,000 FTU/kg 植酸酶和多碳水化合物酶:2,200 U/kg 半乳甘露聚糖酶、30,000 U/kg 木聚糖酶、22,000 U/kg β-葡聚糖酶和 700 U/kg α-半乳糖苷酶 (NCPM)。在整个研究过程中,PC 组和饲喂补充酶日粮的肉鸡在体重 (BW)、平均日增重 (ADG) 和饲料转化率 (FCR) 方面表现出更高的 (P < 0.05) 生长性能,以及通过灰分、钙 (Ca)、磷 (P) 成分和胫骨断裂强度增强的胫骨矿化。在处理中,分配到 NCPM 组的肉鸡在第 21 天和第 35 天表现出更高的能量水平和 P 消化率 (P < 0.05)。关于胴体特性,与所有其他处理相比,在第 21 天和第 35 天饲喂 NCP-2 日粮的肉鸡腿肉产量更高 (P < 0.05)。以 500 FTU/kg 和 750 FTU/kg 的剂量补充植酸酶可有效恢复 0.20% 和 0 的 AP 缺乏症。25%,而不会影响肉鸡的生长性能。此外,结合多种碳水化合物酶和植酸酶导致 AP 和能量损失恢复,从而通过它们的协同相互作用改善胫骨矿化和营养物质消化率。
更新日期:2024-10-05
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