欧盟评估一种内切-1,4-β-木聚糖酶作为育肥鸡、育肥火鸡等动物饲料添加剂的安全性和有效性

2022年7月25日，据欧盟食品安全局（EFSA）消息，应欧盟委员会要求，欧盟动物饲料添加剂和产品（FEEDAP）研究小组就一种内切-1,4-β-木聚糖酶（endo‐1,4‐β‐xylanase ）作为育肥鸡、育肥火鸡、饲养用于产蛋/繁殖的鸡、饲养用于繁殖的火鸡和用于育肥或饲养到产蛋点的小型家禽物种饲料添加剂的安全性和有效性发表科学意见。

据了解，该添加剂是由Komagataella phaffii DSM 33574生产的。

部分原文报道如下：

Following a request from the European Commission, the EFSA Panel on Additives and Products of Substances used in Animal Feed (FEEDAP) was asked to deliver a scientific opinion on the safety and efficacy of the product containing endo-1,4-β-xylanase produced by Komagataella phaffii DSM 33574 (Xylamax) as a zootechnical additive in chickens for fattening, chickens reared for laying/breeding, turkeys for fattening, turkeys reared for breeding and minor poultry species for fattening or raised to the point of lay. The production strain is genetically modified. No viable cells nor recombinant DNA of the production strain were detected in the final product. Therefore, the Panel concluded that the additive does not pose any safety concern regarding the production strain. based on the no observed adverse effect level identified in a subchronic oral toxicity study in rats, the Panel concluded that Xylamax is safe for all poultry species for fattening or reared to the point of lay. Considering the production strain and the results obtained in the genotoxicity studies, the Panel concluded that the additive is safe for the consumers. The Panel also concluded that Xylamax is not irritant to the skin but should be considered a potential eye irritant and a respiratory sensitiser. No conclusions could be drawn on the potential of the additive to cause skin sensitisation. The use of the product as a feed additive is of no concern for the environment. The FEEDAP Panel concluded that the additive has the potential to be efficacious at 10,000 XU/kg feed in chickens for fattening. This conclusion was extended/extrapolated to chickens reared for laying/breeding, turkeys for fattening, turkeys reared for breeding and minor poultry species for fattening or raised to the point of lay.