College of Agriculture, Fisheries and Forestry, Fiji National University, Suva, Fiji Islands.
DSM Nutritional Products - Animal Nutrition & Health, Mapletree Business City, 30 Pasir Panjang Road, Singapore, #13-31, Singapore.
Trop Anim Health Prod. 2021 Aug 2;53(4):426. doi: 10.1007/s11250-021-02853-6.
Cassava (Manihot esculenta), a crop grown in the tropics, is increasingly becoming a vital feed resource for human beings and livestock. Traditionally, cassava has been used primarily as a source of food for humans. However, it is becoming an increasingly important ingredient in livestock feed. The use of cassava leaves and roots in poultry diets is limited because of nutrient imbalances and toxins (hydrogen cyanide (HCN)) found in them. High HCN is reduced to innocuous levels by processing the ingredient using a simple sun drying method. Plant fibre content can be reduced and made available for use by poultry through the use of exogenous enzymes. More recent innovative interventions in biotechnology have brought about various exogenous enzymes that can help improve the digestibility of fibrous diets. These include, among others, carbohydrases, proteases and phytases. The extent to which the animals utilise nutrients is influenced by the type of enzyme and the physicochemical properties of the feed ingredient. This review aims to collate information on the current state of knowledge on the use of exogenous microbial enzymes in diets containing cassava and how the enzymes that target carbohydrates might be useful in making nutrient available for poultry.
木薯（Manihot esculenta），一种在热带地区种植的作物，正日益成为人类和牲畜重要的饲料资源。传统上，木薯主要被用作人类的食物来源。然而，它正逐渐成为牲畜饲料中越来越重要的成分。由于木薯叶和根中的营养失衡和毒素（氢氰酸（HCN）），其在禽类饲料中的应用受到限制。通过使用简单的日晒干燥方法对原料进行加工，可以将高含量的 HCN 降低到无害水平。通过使用外源酶，可以降低植物纤维含量并使其可供家禽使用。最近在生物技术方面的创新干预措施带来了各种外源酶，这些酶有助于提高纤维饲料的消化率。其中包括碳水化合物酶、蛋白酶和植酸酶等。动物对营养物质的利用程度受到酶的类型和饲料成分的物理化学性质的影响。本综述旨在收集有关在含有木薯的饲料中使用外源微生物酶的最新知识状况的信息，以及针对碳水化合物的酶如何有助于使养分可供家禽利用。
