A composition of matter comprising particles which contain choline chloride to be administered in a rumen-protected and post-ruminally effective form, each particle comprising a core which contains choline chloride and a protective coating surrounding the core and protecting choline chloride by ruminal activity while allowing its release into the post-rumen portion of the digestive tract of a ruminant. The core mainly consists of choline chloride in the form of a dry, crystalline powder and, in combination, the protective coating surrounding the core comprises an outer, continuous layer mainly consisting of carnauba wax and an inner, continuous layer consisting of an hydrophobic substance. A feed pellet containing the composition of matter and a premix for feed which contains the composition of matter. A premix for feed which contains feed pellets containing the composition of matter. Mash feed in unpelletted form containing the composition of matter.