本研究旨在评定复合酵母对仔猪的营养价值,重点评定复合酵母在仔猪上表观消化能、表观代谢能、粗蛋白质的真消化率、粗蛋白质的真利用率和氨基酸的回肠消化率.通过化学分析和仔猪消化代谢试验测定复合酵母的营养成分和主要养分的生物利用率.饲养试验采用单因子设计,选用体重(19.9±1.2) kg的"杜×长×大"三元杂交仔猪12头进行消化代谢试验,随机分为2组,每组6个重复,每个重复1头猪.各组分别饲喂无氮饲粮和以复合酵母作为唯一蛋白质源的半纯合饲粮.试验期7 d,预试期3 d,正试期4 d.结果表明:复合酵母粗蛋白质含量高达47.35%,赖氨酸含量为3.43%,蛋氨酸含量为0.72%,赖氨酸:蛋氨酸:色氨酸:苏氨酸=100:21:19:64,与猪的理想蛋白质氨基酸模式接近;复合酵母的表观消化能为14.98 MJ/kg,表观代谢能为14.05 MJ/kg;粗蛋白质的真消化率、真利用率分别为89.71%和69.53%;除了苏氨酸,其他必需氨基酸的回肠真消化率都高于80%.由此可见,复合酵母属于优质蛋白质饲料,蛋白质含量高,氨基酸平衡性好,有效能值高,仔猪对复合酵母的蛋白质、氨基酸的消化利用效果理想.
This study was conducted to evaluate the nutritional value of composite yeast for piglets, and focused on evaluate the apparent digestible energy, apparent metabolizable energy, true digestibility of crude protein, true availability of crude protein and ileal digestibility of amino acids. Nutritional ingredients of composite yeast and bioavailability of its major nutrients were determined by chemical analysis and piglet’s digestion and metabolism trials. A single factor design was used in the feeding trials. Twelve "Duroc×Landrace×Yorkshire" cross breed piglets with body weight of (19.9±1.2) kg were randomly divided into 2 groups with 6 replicates in each group and 1 piglet in each replicate. The pigs in the two groups were fed N-free diet and semi-purified diet with composite yeast as the only protein source, respectively. The trial lasted for 7 days (3 days for adaptation and 4 days for sampling). The results showed that the composite yeast’s crude protein content reached up to 47.35%, lysine content was 3.43%, methionine content was 0.72%, and lysine:methionine:tryptophan:threonine=100:21:19:64, which closed to the ideal protein amino acids model in pig. The apparent digestible energy of composite yeast was 14.98 MJ/kg, and the apparent metabolizable energy was 14.05 MJ/kg; true digestibility and availability of crude protein were 89.71% and 69.53%, respectively; true ileal digestibility of other essential amino acids except threonine were higher than 80%. In conclusion, composite yeast is a high-quality protein feed, and it has high protein content, fine amino acid balance, high effective energy; and protein and amino acids in composite yeast can be better used by piglets.
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