Inclusion of tannase enzyme in tannin-rich diets of lactating animals can be explored as a strategy to overcome the negative effects of tannins on feed utilization and lactational performance. The present study aimed to compare the effect of replacing commercially available exogenous tannase with a newly developed tannase, produced from Aspergillus terreus, on feed utilization and lactational performance of lactating Damascus goats fed tannin-rich pomegranate peel based diet. Thirty lactating Damascus goats were randomly stratified into 3 treatments and fed pomegranate peel-based basal diet at 10% (containing 7.13% tannins DM basis) without exogenous tannase as a control treatment or with addition of 500 IU of new tannase/kg feed daily, or 500 IU of commercial tannase/kg feed daily for 9 weeks. Tannases decreased feed intake and increased diet digestibility; however, new tannase increased (P<0.05) diet digestibility relative to commercial tannase. Tannase treatments increased (P<0.05) blood total protein and glucose concentrations. New tannase improved (P<0.05) milk production and feed efficiency, without affecting milk composition. Moreover, new tannase reduced (P<0.05) total unsaturated fatty acids (UFA) and increased (P<0.05) poly UFA and total conjugated linoleic acid concentrations, while the commercial tannase increased (P<0.05) total SFA and atherogenic index. Tannases reduced (P<0.05) milk total essential amino acids (EAA), total non-EAA, total conditionally EAA, and total branched amino acids. It is concluded that tannases enhanced the utilization of tannin-rich diet by lactating goats, with better results for the new tannase produced from A. terreus compared with the commercial tannase.

可以探索在富含丹宁酸的泌乳动物日粮中加入鞣酸酶，以此作为克服丹宁酸对饲料利用和泌乳性能的不利影响的策略。本研究旨在比较用曲霉曲霉生产的新开发的鞣酸代替市售外源鞣酸的效果。，关于饲喂富含单宁石榴皮的大马士革山羊的饲料利用率和泌乳性能的研究。将30只哺乳期的大马士革山羊随机分为3种处理方法，并以10％（基于7.13％单宁DM含量）的石榴皮为基础的日粮喂养，而无外源鞣酸作为对照处理或每天添加500 IU新的鞣酸酶/千克饲料，或每天500 IU商业鞣酸/ kg饲料，持续9周。鞣质会减少饲料摄入量并增加日粮的消化率；然而，新鞣酸酶相对于商业鞣酸酶增加了饮食消化率（P <0.05）。单宁酶治疗可增加（P <0.05）血液总蛋白和葡萄糖浓度。新的鞣酸酶改善（P <0.05）牛奶的产量和饲料效率，而不会影响牛奶的成分。此外，新的鞣酸酶减少了（P <0。05）总不饱和脂肪酸（UFA）使聚UFA和共轭亚油酸浓度增加（P <0.05），而商用鞣酸酶使总SFA和动脉粥样硬化指数增加（P <0.05）。鞣酸酶减少（P <0.05）牛奶中的总必需氨基酸（EAA），总非EAA，总有条件EAA和总支链氨基酸。结论是，鞣酸酶通过哺乳山羊提高了单宁含量高的饲料的利用率，从中生产的新鞣酸酶效果更好。土曲霉与商业鞣酸相比较。