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A method for early detection of mastitis in cows, effected during normal milking of cows in a milking parlor, by monitoring the milk taken from each cow for the presence of milk clots, comprises cutting the vacuum milk line to each milking station and inserting a filter-detector therein between the

A method for early detection of mastitis in cows, effected during normal milking of cows in a milking parlor, by monitoring the milk taken from each cow for the presence of milk clots, comprises cutting the vacuum milk line to each milking station and inserting a filter-detector therein between the claw and the recorder jar. Each filter-detector comprises a flat-sided transparent casing with a lateral slot which receives a self-sealing slide carrying the filter element. The slide carrier preferably has an integral bypass aperture so that vacuum conditions at the claw end are retained even after the filter element has become blocked. The slide carrier is preferably constructed so that, when in position in the casing, a seepage passage remains between the slide and the casing inner wall, so that cleansing fluid can pass during normal in-place cleaning of the installation.

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A method of detecting milk clots in a milk flow line between a cow and a container including the steps of: placing in a vacuum milk flow line between a cow and the container a filter-detector casing having an inlet, an outlet, opposed transparent faces permitting visual inspection completely through

A method of detecting milk clots in a milk flow line between a cow and a container including the steps of: placing in a vacuum milk flow line between a cow and the container a filter-detector casing having an inlet, an outlet, opposed transparent faces permitting visual inspection completely through the casing, and including in the casing a filter-detector element having a flow cross-sectional area substantially greater than the inlet cross-sectional area or the outlet cross-sectional area, said filter element having a perforated filter-detector area and a bypass opening, exerting a vacuum to draw milk from the cow through the milk flow line and through and filter-detector element such that at least some milk flows through the perforated filter-detector area and wherein air flows through the bypass to maintain vacuum in the milk flow line, the flow cross-sectional area of the bypass being large enough to maintain vacuum in the line even if the perforated area becomes completely clogged, and observing whether milk clots are contained in the milk by viewing the filter-detector area through said transparent faces to observe the presence or absence of milk clots on the filter-detector element. In a system for milking a cow and including a milk flow line connectable at one end to a cow\s udder and connectable at its other end to a vacuum source, the improvement comprising: a filter-detector casing of unitary construction and having a fluid inlet connectable to the milk flow line in communication with the cow and a fluid outlet connectable to a vacuum source, said casing having opposed parallel transparent faces, the axes of the inlet and outlet being parallel to each other and extending parallel to the opposed faces, a filter-detector element removably and reversibly insertable into an open slot in said casing and including sealing means for sealing said open slot when the filter-detector element is positioned therein in either of said reversible positions, said filter-detector element including a perforated filter-detector area extending generally parallel to said opposed faces such that the said filter area is readily visible upon viewing through the opposed transparent faces, said filter-detector also including a bypass opening to assure the presence of a vacuum in the milk flow line, said filter-detector element further comprising a unitary frame surrounding the edge of the perforated filter area to define therewith an inner area, and said unitary frame also includes an outer area which includes means for handling the filter element from outside of the casing, the sealing means defining a continuous line located n the vicinity of the open slot and generally parallelling the edge of the slot, so as to divide the filter-detector into said inner portion on the side thereof within the casing, and said outer portion which is not exposed to the flow of liquid through the casing, and wherein the entire inner portion exposed to liquid flowing through the casing from the inlet to the outlet in either of the reversible positions of the filter-detector within the casing, and the outer portion remains outside of the seal line in either of the reversible positions of the filter-detector.