g of d l methionine 120 g of talc 5 g of sodium carboxymethylcellulose and 150 g of water and they were kneaded the mixture was processed by using an extruder having a screen with an opening size of 1 5 m m to obtain a cylindrical granule the resulting granule was formed by a spherical shaping apparatus marumerizer fuji paudal co ltd to make a granule similar to a spherical shape the spherical granule was dried by fluidized bed dryer to obtain a core containing d l methionine the coating material prepared which is 5 parts by weight of lecithin and 5 parts by weight of magnesium carbonate was dispersed per 90 parts by weight of melted hardened beef tallow the coating material was used in an amount of 43 parts by weight per 100 parts by weight of the core the rate of coating 30 the fluidized bed coater new marumerizer was used the coated particles were subjected to the above evaluation test and the results were as follows the dissolving rate in the rumen was 17 the dissolving rate in the abomasum was 20 and the dissolving rate in the small intestines was 60 the preparation was conducted in the same manner as in example 7 except that in example 8 calcium carbonate was used instead of magnesium carbonate the coated particles were subjected to the above evaluation tests and the results were as follows the dissolving rate in the rumen was 15 the dissolving rate in the abomasum was 26 and the dissolving rate in the small intestines was 59 the preparation was conducted in the same manner.