University of California

Edward J DePeters

Michael J Delwiche

Daniel M Jenkins

Robert H Bondurant

Moshe Rosenberg

This invention provides composite gels to, e.g., efficiently deliver unmodified amino acids, lipids, and/or feed supplements through the rumen of a ruminant animal. The invention also provides methods to make and use composite gels.

Method and compositions for preparing and delivering rumen protected lipids, other nutrients and medicaments

A sensor is provided that is useful for assaying a component of a biological fluid such as blood, urine or milk, and comprises a chamber having an inlet, a liquid containing portion and a vapor containing portion. The liquid and vapor containing portions are in fluid communication. A pressure monitor is in communication with the vapor containing portion and measures pressure change within the vapor containing portion, such as carbon dioxide partial pressure changes which are related to concentration of urea in blood, urine or milk when the enzyme is urease. A method of analyzing a component such as urea in a biological fluid is also provided. Where the biological fluid is dairy milk, milk urea nitrogen to a prediction error of about &plus;/&minus;1 mg/dl may be repeatedly measured in the physiological range of from about 6 to 24 mg/dl.

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Davis, CA, United States of America

Edward J DePeters