摘要
The study evaluated the effects of rumen protected riboflavin (RPRF) and rumen protected pantothenate (RPPA) on growth performance, nutrient digestibility, rumen fermentation and blood metabolites in bulls. Forty Angus bulls were blocked by body weight and randomly assigned to four treatments in a 2 × 2 factorial design, with factors being 0 or 60 mg riboflavin/kg DM from RPRF and 0 or 35 mg pantothenate/kg DM from RPPA. The experimental period was 80 days, with 20 days for adaptation and 60 days for sample collection. Average daily gain increased and feed conversion ratio decreased, and the changes were greater for supplementing RPPA in diets with RPRF than in diets without RPRF. The populations of total protozoa and Ruminococcus albus increased, but the increases were smaller for supplementing RPPA in diets with RPRF than in diets without RPRF. The total-tract digestibility of dry matter, organic matter, crude protein and neutral detergent fibre increased with RPRF or RPPA addition. The digestibility of acid detergent fibre increased with RPPA addition, and digestibility of non-fibre carbohydrate increased with RPRF addition. The rumen pH and ammonia-N concentration decreased, but total volatile fatty acids concentration and acetate to propionate ratio increased with RPRF or RPPA supplementation. The activities of xylanase and pectinase and populations of total bacteria, R. flavefaciens and Prevotella ruminicola increased with RPRF or RPPA supplementation. The populations of total fungi and Fibrobacter succinogenes increased with RPRF addition, and the activities of α-amylase and protease increased with RPPA addition. The data suggested that RPRF or/and RPPA supply improved growth performance of bulls, and the effect seemed to be due mostly to the vitamins released in the rumen.
摘要译文
该研究评估了瘤胃保护的核黄素（RPRF）和瘤胃保护的泛肽（RPPA）对公牛中生长性能，营养消化率，瘤胃发酵和血液代谢产物的影响。在2×2阶乘设计中，通过体重阻止了四十个安格斯公牛，并随机分配给四种治疗方法，其中RPRF的0或60 mg核黄素/kg DM和RPPA的0或35 mg Pantothenate/kg DM。实验期为80天，适应时间为20天，样品收集60天。平均每日增益增加，饲料转化率降低，并且与没有RPRF的饮食相比，补充RPRF饮食中的RPPA的变化更大。原生动物总原生动物和阿不属的Ruminococcus的种群增加了，但是补充RPRF饮食中RPPA的增加比没有RPRF的饮食中的RPPA小。随着RPRF或RPPA的添加，干物质，有机物，粗蛋白和中性洗涤剂纤维的总消化率增加。酸洗涤剂纤维的消化率随RPPA的添加增加而增加，而非纤维碳水化合物的消化率随RPRF添加而增加。瘤胃pH和氨-N-N浓度降低，但随着RPRF或RPPA的补充，总挥发性脂肪酸浓度和乙酸丙酸丙酸酯的浓度增加。二甲那酶，果胶酶以及总细菌，氟烷氏菌和prevotella uminicola的活性随RPRF或RPPA补充而增加。随着RPRF的添加，总真菌和纤维杆菌的种群增加了，α-淀粉酶和蛋白酶的活性随RPPA添加而增加。数据表明，RPRF或/和RPPA的供应改善了公牛的生长性能，其影响似乎主要是由于瘤胃中释放的维生素。
C. Wang; J. Zhang; Q. Liu; G. Guo; ... Y.W. Zhang. Rumen protected riboflavin and rumen protected pantothenate improved growth performance, nutrient digestion and rumen fermentation in Angus bulls[J]. Animal Feed Science and Technology, 2022,291