LEAF - Linking Landscape, Environment, Agriculture and Food Research Center, Associate Laboratory TERRA, Higher Institute of Agronomy, University of Lisbon, Tapada da Ajuda, 1349-017 Lisbon, Portugal.
Department of Agricultural and Food Sciences (DISTAL), Alma Mater Studiorum, University of Bologna, Viale G. Fanin 46, Bologna, Italy.
Animal. 2024 Jun;18(6):101189. doi: 10.1016/j.animal.2024.101189. Epub 2024 May 17.
Laminaria digitata is a brown seaweed rich in prebiotic polysaccharides, mainly laminarin, but its alginate-rich cell wall could compromise nutrient access. Carbohydrase supplementation, such as individual alginate lyase and carbohydrases mixture (Rovabio® Excel AP), could enhance nutrient digestibility and prebiotic potential. This study aimed to evaluate the effect of these enzymes on nutrient digestibility and gut health of weaned piglets fed with 10% L. digitata. Diets did not affect growth performance (P > 0.05). The majority of the feed fractions had similar digestibility across all diets, but the supplementation of alginate lyase increased hemicellulose digestibility by 3.3% compared to the control group (P = 0.047). Additionally, we observed that algal zinc was more readily available compared to the control group, even without enzymatic supplementation (P < 0.001). However, the increased digestibility of some minerals, such as potassium, raises concerns about potential mineral imbalance. Seaweed groups had a higher abundance of beneficial bacteria in colon contents, such as Prevotella, Oscillospira and Catenisphaera. Furthermore, the addition of alginate lyase led to a lower pH in the colon (P < 0.001) and caecum (P < 0.001) of piglets, which is possibly a result of released fermentable laminarin, and is consistent with the higher proportion of butyric acid found in these intestinal compartments. L. digitata is a putative supplement to enhance piglet gut health due to its prebiotic polysaccharides. Alginate lyase supplementation further improves nutrient digestibility and prebiotic potential. These results suggest the potential use of L. digitata and these enzymatic supplements in commercial piglet-feeding practices.
裙带菜是一种富含益生元多糖的褐藻，主要是褐藻糖胶，但它富含褐藻酸盐的细胞壁可能会影响营养物质的吸收。碳水化合物酶补充剂，如单独的褐藻胶裂解酶和碳水化合物酶混合物（Rovabio® Excel AP），可以提高养分消化率和益生元潜力。本研究旨在评估这些酶对饲粮中添加 10%裙带菜的断奶仔猪养分消化率和肠道健康的影响。饲粮对生长性能没有影响（P＞0.05）。大多数饲料级分在所有饲粮中的消化率相似，但与对照组相比，褐藻胶裂解酶的添加使半纤维素消化率提高了 3.3%（P＝0.047）。此外，我们观察到与对照组相比，藻类锌更容易被吸收，即使没有酶的补充也是如此（P＜0.001）。然而，一些矿物质（如钾）消化率的提高引起了人们对潜在矿物质失衡的担忧。海藻类组的结肠内容物中有益菌（如普雷沃氏菌、真杆菌属和互营杆菌属）的丰度更高。此外，褐藻胶裂解酶的添加导致仔猪结肠（P＜0.001）和盲肠（P＜0.001）的 pH 值降低，这可能是由于可发酵褐藻糖胶的释放，这与这些肠道部位中发现的更高比例的丁酸一致。裙带菜由于其益生元多糖，是一种增强仔猪肠道健康的潜在补充剂。褐藻胶裂解酶的补充进一步提高了养分消化率和益生元潜力。这些结果表明，裙带菜和这些酶补充剂在商业仔猪饲养实践中有潜在的应用。
