近期的一項(xiàng)試驗(yàn)表明評(píng)估飼料中酶活性的重要性，強(qiáng)調(diào)了木聚糖酶性能特性方面的差異。
該肉雞試驗(yàn)開展于波蘭的一所大學(xué)，評(píng)估了三種不同小麥型基礎(chǔ)日糧中木聚糖酶的活性。三種日糧制粒前的調(diào)質(zhì)溫度分別為80?C、85?C、 90?C，其它所有特性均相同。結(jié)果表明調(diào)質(zhì)溫度對(duì)酶活力有顯著影響，僅有一種木聚糖酶活性保持穩(wěn)定。
確保飼料穩(wěn)定性
AB Vista公司的全球技術(shù)總監(jiān)Dr Hadden Graham指出，注意酶活性的潛在差異及檢測(cè)實(shí)際水平是確保飼料穩(wěn)定性的關(guān)鍵。飼料配方的成功越來越依靠于所添加酶的性能優(yōu)勢(shì)。因此，掌握檢測(cè)酶活的方法是質(zhì)量保證程序中一個(gè)重要部分。這項(xiàng)研究表明，我們不能簡(jiǎn)單地添加木聚糖酶并且假定其具備預(yù)想的效果，尤其是當(dāng)制粒溫度較高時(shí)。
穩(wěn)定的酶活性
試驗(yàn)中兩種較高調(diào)質(zhì)溫度日糧降低了其中木聚糖酶活性， 導(dǎo)致在試驗(yàn)35天時(shí)降低肉雞消化道內(nèi)食糜粘度失敗，最終導(dǎo)致生長(zhǎng)性能的下降。試驗(yàn)發(fā)現(xiàn)僅有Econase木聚糖酶在制粒過程中保持了活性穩(wěn)定。另外，這種酶在不同調(diào)質(zhì)溫度制定日糧，對(duì)試驗(yàn)雞0-35天的體增重、飼料效率的影響均保持一致。這個(gè)試驗(yàn)表明分析飼料中酶活性的重要性，尤其是調(diào)質(zhì)溫度發(fā)生改變時(shí)。也表明飼料中酶的選擇是決定動(dòng)物生長(zhǎng)性能原一個(gè)關(guān)鍵因素。
附原文：
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.
該肉雞試驗(yàn)開展于波蘭的一所大學(xué)，評(píng)估了三種不同小麥型基礎(chǔ)日糧中木聚糖酶的活性。三種日糧制粒前的調(diào)質(zhì)溫度分別為80?C、85?C、 90?C，其它所有特性均相同。結(jié)果表明調(diào)質(zhì)溫度對(duì)酶活力有顯著影響，僅有一種木聚糖酶活性保持穩(wěn)定。
確保飼料穩(wěn)定性
AB Vista公司的全球技術(shù)總監(jiān)Dr Hadden Graham指出，注意酶活性的潛在差異及檢測(cè)實(shí)際水平是確保飼料穩(wěn)定性的關(guān)鍵。飼料配方的成功越來越依靠于所添加酶的性能優(yōu)勢(shì)。因此，掌握檢測(cè)酶活的方法是質(zhì)量保證程序中一個(gè)重要部分。這項(xiàng)研究表明，我們不能簡(jiǎn)單地添加木聚糖酶并且假定其具備預(yù)想的效果，尤其是當(dāng)制粒溫度較高時(shí)。
穩(wěn)定的酶活性
試驗(yàn)中兩種較高調(diào)質(zhì)溫度日糧降低了其中木聚糖酶活性， 導(dǎo)致在試驗(yàn)35天時(shí)降低肉雞消化道內(nèi)食糜粘度失敗，最終導(dǎo)致生長(zhǎng)性能的下降。試驗(yàn)發(fā)現(xiàn)僅有Econase木聚糖酶在制粒過程中保持了活性穩(wěn)定。另外，這種酶在不同調(diào)質(zhì)溫度制定日糧，對(duì)試驗(yàn)雞0-35天的體增重、飼料效率的影響均保持一致。這個(gè)試驗(yàn)表明分析飼料中酶活性的重要性，尤其是調(diào)質(zhì)溫度發(fā)生改變時(shí)。也表明飼料中酶的選擇是決定動(dòng)物生長(zhǎng)性能原一個(gè)關(guān)鍵因素。
附原文：
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.
