Rumen degradability and whole tract digestibility of flavonolignans from milk thistle (Silybum marianum) fruit expeller in dairy cows
Rumen degradability and whole tract digestibility of flavonolignans from milk thistle (Silybum marianum) fruit expeller in dairy cows
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DOI：
10.17221/1285-cjas
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发表时间：
2011-01-01
影响因子：
1.2
通讯作者：
Buchta, M.
中科院分区：
文献类型：
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作者：
Krizova, L.;Watzkova, J.;Buchta, M.
本研究的目的是确定奶牛的瘤胃降解率和总消化率的奶蓟果压榨机考虑牛奶生产和血浆中的黄酮木脂素的变化。试验在三头泌乳荷斯坦奶牛上进行，分为三个阶段：初步阶段（Pr，3天）用于饮食稳定，随后是适应阶段（A，6天），在适应阶段（A，6天）中进行处理，然后是平衡阶段（B，4天）。奶牛每天单独饲喂两次（6：40和16：40 h），自由采食以玉米青贮、卢塞恩干草和补充混合物为基础的日粮。在阶段A和B中，饮食补充有150 g/天的奶蓟果压榨机，在每次喂食时以两个相等的部分施用。各时期平均每日干物质和基本营养素摄入量相似（P > 0.05）。处理对奶牛产奶量和乳成分无显著影响（P > 0.05）。本实验中使用的水飞蓟果实压榨器含有4.10 +/-0.10质量%的水飞蓟素复合物。水飞蓟宾A和B的消化率分别为40.0%和45.5%。水飞蓟素复合物的其他组分的消化率为100%。其中花旗松素的有效降解率最高，为59.11%，其他黄酮木脂素的有效降解率为23.28%~ 35.19%。结果表明，给药组血浆结合型水飞蓟宾含量显著高于对照组（P < 0.001）。
The objective of this study was to determine rumen degradability and total digestibility of flavonolignans from a milk thistle fruit expeller in dairy cows considering milk production and changes in plasma flavonolignans. The experiment was carried out on three lactating Holstein cows and was divided into three periods as follows: preliminary period (Pr, 3 days) was used for the diet stabilization followed by the adaptation period (A, 6 days) in which the treatment was applied and by the balance period (B, 4 days). Cows were fed individually twice a day (6: 40 and 16: 40 h) ad libitum the diet based on maize silage, lucerne hay and supplemental mixture. In the periods A and B the diet was supplemented with 150 g/day of milk thistle fruit expeller applied in two equal portions at each feeding. Average daily intake of dry matter and basic nutrients was similar in all periods (P > 0.05). Milk yield and composition were not affected by the treatment (P > 0.05). The milk thistle fruit expeller used in this experiment contained 4.10 +/- 0.10 mass percentage of the silymarin complex. Digestibility of silybin A and silybin B was 40.0 and 45.5%, respectively. Digestibility of other components of the silymarin complex was 100%. The highest value of the effective degradation was found for taxifolin (59.11%), while the effective degradation of the other flavonolignans ranged from 23.28 to 35.19%. Animals receiving the milk thistle fruit expeller had a higher content of plasma conjugated silybin (P < 0.001) than those without its supplementation.