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Title of the paper: <b>Relationship between milk yield, fertility and</b> amount of disease of Holstein Friesian dairy cowsData of 1 841 lactations of 353 Holstein Friesian dairy cows and data according to theirreproductive fertility and diseases were analysed over a period of five years in a breedingfarm in Thüringen (Germany). As a result the lowest success of first service has beenachieved at a lactation (ranged) between 9 000 and 11 000 kg. The time between calvingand the following first service varied according to the first disease in last lactation. Withrising milk yield the frequency of diseases and the success of first service tend todecrease. Cows achieving a 305 day milk yield of more than 11 000 kg showed with 56 %the lowest frequency of diseases. In average 60 % of all dairy cows need to be treatedonce in a lactation. The diseases of highest prevalence are in the field of reproductivefertility and udder health. For heifers a decreased success of first service has beendetected if they showed an increased prevalence of illness

Wechselbeziehungen zwischen dem Milchleistungsniveau, der Fruchtbarkeit und dem Krankheitsgeschehen bei Holstein Friesian Milchkühen