This paper deals with the importance of longevity and lifetime performance of dairy cows for breeders and selection decisions. The longevity of dairy cows is crucial for economic milk production. In intensive farming systems, cows often do not reach their genetic potential, which is a challenge for farmers. Better longevity increases profitability, as cows that remain in the herd longer produce more milk over their lifetime and reduce the need for replacement heifers. Longevity depends on genetic and environmental factors as well as age at first calving. The conformation traits of cows, such as udder, frame, feet and legs, are key to longevity. Poor udder traits increase the risk of injury and mastitis, which can lead to early culling. Optimal body conformation ensures a longer lifespan and higher productivity. For this study, we analysed the lifetime performance of cows that exceeded 100,000 kg of milk. The 246 black and white cows that exceeded 100,000 kg of milk by the end of 2023 were analysed. The average lifetime production of the cows analysed was 108,713 kg of milk. The average age of these cows was 11.7 years. On average, they completed 9.26 lactations. The Slovenian bulls have the highest number of offspring (155), which shows that Slovenian selection for longevity traits works excellently.
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