Growth promoters for animals

An injectable composition comprising microparticles, wherein said microparticles comprise a biodegradable polymeric matrix, wherein said composition comprises two or more steroid growth promoters, wherein each of said steroid growth promoters is separately microencapsulated in said polymeric matrix such that each of said microparticles contains a single steroid growth promoter, and wherein said microparticles are loaded with 1 to 75 wt. % of said growth promoter based on the weight of said polymeric matrix.

An injectable composition comprising microparticles, wherein said microparticles comprise a biodegradable polymeric matrix, wherein said composition comprises two or more steroid growth promoters, wherein each of said steroid growth promoters is separately microencapsulated in said polymeric matrix such that each of said microparticles contains a single steroid growth promoter, and wherein said microparticles range in size from submicron to 500.mu..

An injectable composition comprising microparticles, wherein said microparticles comprise a biodegradable polymeric matrix, wherein said composition comprises two or more steroid growth promoters, wherein each of said steroid growth promoters is separately microencapsulated in said polymeric matrix such that each of said microparticles contains a single steroid growth promoter, and wherein said microparticle composition is in a liquid injection vehicle.

An injectable composition comprising microparticles, wherein said microparticles comprise a biodegradable polymeric matrix, wherein said composition comprises two or more steroid growth promoters, wherein each of said steroid growth promoters is separately microencapsulated in said polymeric matrix such that each of said microparticles contains a single steroid growth promoter, wherein said microparticle composition is in a liquid injection vehicle, and wherein said liquid injection vehicle is selected from the group consisting of physiological saline solution, and an aqueous solution of carboxymethylcellulose with a surfactant.

An injectable composition comprising microparticles, wherein said microparticles comprise a biodegradable polymeric matrix, wherein said composition comprises two or more steroid growth promoters, wherein each of said steroid growth promoters is separately microencapsulated in said polymeric matrix such that each of said microparticles contains a single steroid growth promoter, and wherein said microparticles are administered by intramuscular injection.

An injectable composition comprising microparticles, wherein said microparticles comprise a biodegradable polymeric matrix, wherein said composition comprises two or more steroid growth promoters, wherein all of said steroid growth promoters are co-microencapsulated in said polymeric matrix such that all of said microparticles contain all of said steroid growth promoters, and wherein the polymeric matrix of said microparticle composition is selected from the group consisting of poly-d,l-lactic acid, poly-L-lactic acid, polyglycolic acid, copolymers of mixed d,l-lactic acid and glycolic acid, copolymers of L-lactic acid and glycolic acid, copolyoxylates, polycaprolactone, poly(lactic acid-caprolactone), poly(glycolic acid-caprolactone), casein, albumin, and waxes.

An injectable composition comprising microparticles, wherein said microparticles comprise a biodegradable polymeric matrix, wherein said composition comprises two or more steroid growth promoters, wherein all of said steroid growth promoters are co-microencapsulated in said polymeric matrix such that all of said microparticles contain all of said steroid growth promoters, and wherein said microparticles are loaded with 1 to 75 wt. % of said growth promoter based on the weight of said polymeric matrix.

An injectable composition comprising microparticles, wherein said microparticles comprise a biodegradable polymeric matrix, wherein said composition comprises two or more steroid growth promoters, wherein all of said steroid growth promoters are co-microencapsulated in said polymeric matrix such that all of said microparticles contain all of said steroid growth promoters, and wherein said microparticles range in size from submicron to 500.mu..

An injectable composition comprising microparticles, wherein said microparticles comprise a biodegradable polymeric matrix, wherein said composition comprises two or more steroid growth promoters, wherein all of said steroid growth promoters are co-microencapsulated in said polymeric matrix such that all of said microparticles contain all of said steroid growth promoters, and wherein said microparticle composition is in a liquid injection vehicle.

An injectable composition comprising microparticles, wherein said microparticles comprise a biodegradable polymeric matrix, wherein said composition comprises two or more steroid growth promoters, wherein all of said steroid growth promoters are co-microencapsulated in said polymeric matrix such that all of said microparticles contain all of said steroid growth promoters, wherein said microparticle composition is in a liquid injection vehicle, and wherein said liquid injection vehicle is selected from the group consisting of physiological saline solution and an aqueous solution of carboxymethylcellulose with a surfactant.

An injectable composition comprising microparticles, wherein said microparticles comprise a biodegradable polymeric matrix, wherein said composition comprises two or more steroid growth promoters, wherein all of said steroid growth promoters are co-microencapsulated in said polymeric matrix such that all of said microparticles contain all of said steroid growth promoters, and wherein said microparticles are administered by intramuscular injection.