This invention relates generally to permanent magnets designed to be deposited in a stomach of a ruminant animal, such as a dairy cow, for attracting, collecting and holding sharp ferrous metal objects which may be ingested by the animal during grazing to prevent hardware disease and inhibit sharp objects from passing through the digestive system of the animal. The permanent magnet assembly as in claim 4 wherein said paramagnetic substance is high carbon steel. The permanent magnet assembly as in claim 1 wherein said cylindrical rod is made from a paramagnetic substance.ĥ. The permanent magnet assembly as in claim 2 wherein the outer diameter of said right circular cylindrical base is generally equal to the outer diameter of said plurality of magnets.Ĥ.

The permanent magnet assembly as in claim 1 wherein said end caps comprise a truncated cone segment integrally formed with a right circular cylindrical base, said cylindrical base being integrally joined to one end of each of said pair of tubular sleeves.ģ. (ii) a cylindrical rod of a length slightly less than the stack's length and an outer diameter greater than said second predetermined diameter, said rod being inserted through said central bores of said tubular sleeves following insertion of said tubular sleeves through said central bores in said plurality of magnets and said plurality of spacer members whereby the insertion of said rod expands said tubular sleeves to tightly engage the wall surfaces defining said central bores in said plurality of magnets and said plurality of spacer members.Ģ. (i) a pair of molded plastic tubular sleeves of an outer diameter creating a predetermined interference fit when inserted through said center bores of said cylindrical magnets and said spacer members from opposed ends of said stack, said tubular sleeves each having a central bore of a second predetermined diameter and an integrally formed end cap member on one end thereof and (c) means for maintaining said plurality of magnets and said plurality of spacer members in a stack with at least one of said spacer members interposed between two adjacent cylindrical magnets, said means including: (b) a plurality of cylindrical spacer members, each having an outer diameter generally the same as that of said cylindrical magnets and a center bore generally of the same diameter as said predetermined diameter

(a) a plurality of cylindrical magnets, each with a center bore of a predetermined diameter formed through the length dimension thereof A permanent magnet assembly adapted to be located in the reticulum stomach chamber of a ruminant animal comprising: This magnet has a strength of: 2000 Gauss (0.1. Size: 3in (75mm) long, 0.5in (12mm) in diameter Color: Shiny silver. They are very powerful and are great for general experimentation with magnets. One magnet works for the life of the cow! These cow magnets also make a great addition to your science project. Cow magnets help prevent this disease by attracting stray metal from the folds and crevices of the rumen and recticulum. The cow loses her appetite and decreases her milk output (dairy cows), or her ability to gain weight (feeder stock). Tramp iron tends to lodge in the honeycombed walls of the recticulum, threatening the surrounding vital organs and causing irritation and inflammation, known as Hardware Disease. While grazing, cows eat everything from grass and dirt to nails, staples and bits of bailing wire (referred to as tramp iron).

Nitrile Medical Exam and Industrial Glovesĭo you know why are these magnets called cow magnets? Cow magnets are popular with dairy farmers and veterinarians to help prevent Hardware Disease in their cattle.