Delayed and sustained urea release compositions

Abstract

Delayed and sustained urea release compositions comprising association products with acrylic acid polymers, for ruminant feed supplementation.

We claim: 
     
       1. In feed supplement rations for ruminants comprising an association product of a .[.minor.]. .Iadd.major .Iaddend.proportion of urea and a .[.major.]. .Iadd.minor .Iaddend.porportion of carboxy vinyl polymer, the improvement which consists of incorporating with said association product a minor effective proportion of an alpha olefin polymer, whereby urea release rates are extended. 
     
     
       2. The feed supplement rations of claim 1, wherein said alpha olefin polymer is an ethylene polymer. 
     
     
       3. The feed supplement rations of claim 2, wherein said alpha olefin polymer is an ethylene-vinyl acetate copolymer. 
     
     
       4. The feed supplement rations of claim 1, wherein the proportion of alpha olefin polymer:association product is at least 95:5 by weight. 
     
     
       5. The feed supplement rations of claim 1, exhibiting a urea release rate (Ur 1/2) of at least about 5 hours.