Supplies of Rumen Infusoria and Blood Plasma Levels of Vitamin B₁₂ In Heifers During The Transitional Period

Abstract

lt is important to know time required for animal adaptation to changed nutrition, especially adaptation of rumen microorganisms. To met ruminants demands for vitamin B₁₂, rumen function and Co intake are inevitable. Until the function of rumen microflora is well established, vitamin B₁₂ must be provided via the feed. When rumen function is effected, for is instance when high concentrate-diets are fed, cobalt supplements will not be effective.² This work was aimed at study of changes of rumen infusoria and plasma vitamin B₁₂ levels in heifers before and after the transition to green feeding.