发布: 2016-07-09 | 作者: 佚名 | 来源: 转载
AB Vista公司的全球技术总监Dr Hadden Graham指出，注意酶活性的潜在差异及检测实际水平是确保饲料稳定性的关键。饲料配方的成功越来越依靠于所添加酶的性能优势。因此，掌握检测酶活的方法是质量保证程序中一个重要部分。这项研究表明，我们不能简单地添加木聚糖酶并且假定其具备预想的效果，尤其是当制粒温度较高时。
In-feed enzyme activity: analyse it!
A recent study has demonstrated the importance of assessing in-feed enzyme activity, highlighting a variation in performance characteristics of xylanases.
The study, a broiler trial conducted at a Polish University, assessed the thermostability of three different commercial xylanases applied to wheat-based diets, processed at three different conditioning temperatures （80, 85 and 90?C
） prior to pelleting. The results showed that conditioning temperature had a significant impact on enzyme activity, with only one of the xylanase enzymes sustaining a consistent effect across the temperature range.
Ensuring feed consistency
AB Vista's Global Technical Director, Dr Hadden Graham, says that being aware of the potential for variation in enzyme activity – and testing for it – is critical to ensuring feed consistency. “The success of feed formulations increasingly depends on performance benefits delivered by enzymes, so having the ability to test feed for enzyme activity is an important part of quality assurance procedures. ”This study demonstrates that we can't simply add xylanase and assume it's having the expected effect, particularly at the higher pelleting temperatures in common commercial use.
Consistent enzyme performance
The two products that lost activity at higher processing temperatures were subsequently unable to sufficiently reduce digesta viscosity in broilers at 35 days, and this was linked to a reduction in animal performance. The study found that only Econase XT maintained consistent enzyme performance across processing temperatures. In addition, this enzyme maintained a consistent 0-35 day body weight corrected feed conversion ratio at each temperature. “This trial shows the importance of analysing in-feed enzyme activity, particularly because temperatures can vary even within a feed mill, between targets and actuals. The results also demonstrate why enzyme selection can play a key role in animal performance,” Dr Graham says.