Drug – bio-affecting and body treating compositions – Baits – attractants – or lures
Patent
1997-01-14
1998-02-24
Pak, John
Drug, bio-affecting and body treating compositions
Baits, attractants, or lures
424405, 424408, 424409, 424410, 424417, 424489, 424499, 424 50, 424501, 424502, 514167, 514432, 514457, 514681, 514951, 426 1, A01N 2500, A01N 2508, A01N 2512, A01N 4316
Patent
active
057209510
DESCRIPTION:
BRIEF SUMMARY
This application is 371 of PCT/GB95/01629, filed on Jul. 11, 1995.
This invention relates to rodenticidal baits; that is to say, edible compositions which are attractive to rodents (especially rats and mice) and which contain a rodenticide.
Many types of bait are in commercial use and others have been proposed. They include grains; pellets usually prepared by extrusion or casting; wax blocks again usually prepared by extrusion or by casting, and wherein the edible material attractive to rodents is incorporated into the wax; and meal baits comprising cereals processed in various ways. Cereal based baits containing a rodenticide and a water-soluble film forming binder are described in, for example, DE-A-2317285, DE-A-1929137, CH-A-348003, FR-A-2260948 and FR-A-2659194. These baits are in the form of granules, for example pellets, generally produced by pressure compaction techniques. Such techniques include, for example, the use of a roll compactor (briquetting press) or a tabletting press. In addition, Belgian Patent 847,653 discloses rodenticidal baits consisting of a core of edible material coated with an external film which itself contains a rodenticide. None of these references suggests that the attraction of cereal based baits to rodents can be enhanced by using different size cereal particles in particular proportions.
According to the present invention there is provided a rodenticidal bait in the form of agglomerated granules having an open texture comprising (1) a cereal base in which from 2% to 10% of the cereal particles have a size in the range of equal to or greater than 500 .mu.m up to less than or equal to 1000 .mu.m, and from 70% to 90% of the cereal particles have a size in the range of equal to or less than 250 .mu.m, (2) a rodenticide, and (3) a water-soluble film-forming binder.
Preferably, the rodenticidal bait contains a palatability-enhancing agent.
The rodenticide bait can contain further components, for example, a colouring agent, a preservative, or a substance to deter human consumption of the bait.
The size of agglomerated granules is preferably in the range of 0.20 mm to about 10 mm, more preferably about 0.25 mm to about 10 mm, even more preferably 0.25 mm to 5 mm.
Overall, the agglomerated granules are generally rounded in shape but with minor irregularities which provide attractive sites for gnawing by rodents.
The granules may be prepared by applying conventional granulating methods to a mixture of the components. The water soluble film-forming binder is included in the granulating process as an aqueous solution. As the wet granules formed in the process dry out, the film-forming binder stabilises the granules by binding together the particles of the components. The film-forming binder also causes individual granules to stick together to form agglomerates or lumps having an open texture because of gaps between the individual granules. (We would mention that to some extent the term "granulation" is used generically in the art as a convenient term to describe all the processes by which rodenticide baits have been prepared. However, the present invention relates to a novel rodenticide bait in the form of an agglomerated granule and processes for its preparation.)
This open texture may be more attractive to rodents than prior art baits. For example the open texture may be more attractive to rodents than solid block baits, such as pellets, since they are able to detach small portions from the granule agglomerate more easily than from a solid block or a pellet.
Indeed, the bait of the present invention which is rough and irregular can be contrasted with smooth and uniform prior art baits, particularly the pellet.
The agglomerated granules of the invention may also be more palatable to rodents than baits hitherto proposed, because the various non-palatable ingredients such as the dye and the rodenticide are distributed evenly throughout the granules and not confined for example to a film on the surface of the bait as in the bait disclosed in Belgian Patent 847,653.
As previously menti
REFERENCES:
patent: 3223231 (1965-12-01), Connolly
patent: 4992275 (1991-02-01), Lush
patent: 5044113 (1991-09-01), Stack et al.
Shafi, M.M. et al., "Taste Enhancers Improve Poison Bait Acceptance in Field Rodents Damaging Wheat Crop," Tropical Pest Management, vol. 38, No. 2, pp. 214-217, 1992.
Shafi, M.M. et al., "Role of Some Taste Additives to Enhance Poison Bait Acceptance in Black Rat, Rattus Rattus L.," Tropical Pest Management, vol. 36, No. 4, pp. 371-374, 1990.
Shafi, M.M. et al., "Enhancement of Poison Bait Acceptance Through Taste Additives in Rattus Norvegicus," Joural of Stored Products Research, vol. 28, No. 4, 1992, pp. 239-243.
Ackerman Joel G.
Pak John
Zeneca Limited
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