Gervit-W is suitable to be given in the drinking-water, in order to prevent caused by vitamin deficiencies during the racingtime, exhibitions, breedingtime and the moulting. An additional feeding of Gervit-W is recommended to the increased vitamin requirements after stress. Betaine has a positive influence on the water balance and liver metabolism, which is useful when flying in hot weather. It is also recommended to feed Gervit-W in order to cover the increased vitamin requirement after strain.