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摘要:
There are many rumen protected amino acid products available for dairy cattle feeding. However, feed formulation programs require values related to rumen solubility, rate of disappearance in the rumen and total tract digestibility and often such values are not available. In vivo testing procedures are complex, time consuming and expensive. This study was conducted to determine if a newrapid, lower cost in vitro method developed for feed ingredients could be applied to a rumen protected lysine product (DairynatLys-30, Jefo Nutrition Inc). In vivo determination of the rapidly solubilized protein fraction, rate of degradation of the slowly solubilized fraction and total tract digestibility studies were compared to the in vitro method in use in many ingredient analysis laboratories for feed ingredients such as forages, protein supplements and grains. Results showed that the rapidly soluble fraction (8.33% and 8.66% of total N for in vivo and in vitro methods) and rates of disappearance in the rumen (2.64%/h and 2.43%/h for in vivo and in vitro procedures) compared favorably between the two methods for the rumen protected product. Total tract digestibility values were slightly higher (84.4%) with the in vivo method used than with the in vitro method (75.9%), and both are in the expected calculated range of digestibility of 80%. In conclusion the in vitro method appears to be an acceptable alternative for evaluating rumen protected amino acids.
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篇名 Methods to Evaluate Rumen Protected Lysine for Dairy Cows
来源期刊 动物科学期刊(英文) 学科 医学
关键词 RUMEN Protected AMINO ACIDS LYSINE In VITRO Testing
年,卷(期) 2015,(4) 所属期刊栏目
研究方向 页码范围 495-499
页数 5页 分类号 R73
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研究主题发展历程
节点文献
RUMEN
Protected
AMINO
ACIDS
LYSINE
In
VITRO
Testing
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研究分支
研究去脉
引文网络交叉学科
相关学者/机构
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动物科学期刊(英文)
季刊
2161-7597
武汉市江夏区汤逊湖北路38号光谷总部空间
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381
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