Seyama T, Hirayasu H, Yamawaki K, Adachi T, Sugimoto T, Kasai K. Development of three-layered rumen escapable capsules for cattle.
J Vet Med Sci 2017;
78:1765-1769. [PMID:
27546371 PMCID:
PMC5240752 DOI:
10.1292/jvms.16-0337]
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Abstract
A new rumen escapable tool is presented for cattle in prospect of developing medical
treatment or supplementing trace elements for disease prevention. This tool consists of a
three-layered capsule that dissolves in the lower digestive tract, but not in the rumen.
The capsule was manufactured by capsule-forming techniques through the use of liquid
surface tension. This method does not involve high-temperature treatment, so the capsule
can contain not only lipophilic substances but also hydrophilic or heat-sensitive
substances. Furthermore, the capsule has a specific gravity of 1.3 and diameter of 6.0 mm,
which were previously shown to be appropriate to avoid rumination. The objective of this
study was to confirm the effectiveness of the capsule pertinent to rumen escaping. In
order to validate rumen escape, capsules containing 30 g of water-soluble vitamin
(thiamine hydrochloride) per head were administered to four lactating cows assigned in a
crossover trial. In the group administered encapsulated thiamine hydrochloride, blood
thiamine levels increased from 12.4 ± 1.03 ng/ml before
administration to 54.8 ± 2.21 ng/ml at 6 hr following
administration, whereas the level remained at 13.3 ± 2.05
ng/ml in the control group administered via aqueous
solution. This indicates that the three-layered capsules passed through the rumen and
dissolved in the lower digestive tract, thus functioning as a rumen escapable tool.
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