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This study was conducted to examine the effect of an extended, 18 months, calving interval (CI) in comparison with a traditional 12 months CI, on milk production and milk composition. In addition, the cows had different milking frequencies (MF), either two or three times per day. This resulted in four treatment groups; referred to as 12-2, 12-3, 18-2 and 18-3. Cows of Swedish Red and White breed were...