Delayed release feed-through veterinary compositions with ovicidal and larvicidal activity against susceptible and resistant strains of parasites in ruminants' feces, use of these compositions, method for delaying the release of these compositions

A method to control eggs and larvae of helminths present in ruminants' feces, said method comprising administering to an animal, by oral route, through means of feed or feed supplement, the composition comprising:

• (a) at least one benzimidazole compound;
• (b) at least one hydrophobic polymer;
• (c) at least one particulate solid carrier, and
• (d) optionally, at least one hydrophilic polymer, wherein
• said composition is delayed released with respect to said benzimidazole compound such that the release occurs in the feces of said ruminant, and wherein said benzimidazole compound is present in an amount of from 0.1 wt % to about 20 wt %, said hydrophobic polymer is present in an amount of from about 5 wt % to about 55 wt %, said hydrophilic polymer is present in an amount of from 0 wt % to about 40 wt % and said particulate solid carrier is present in an amount of from 40 wt % to about 75 wt %, based on a total weight of said composition and the hydrophobic polymer is ethylcellulose, zein, a methyl methacrylate copolymer, or any combination thereof.