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Frequency of extended lactations and their effect on milk and reproductive performanceof cows from the active population of 11 891 Black and White cows with differentproportions of Holstein Fresian inheritance were analysed. It was found that lactationslonger than a 305-day standard lactation were quite common in the analysed populationof Black-and-White cows improved with the Holstein-Friesian breed. The age of cows, thelevel of yield in a standard lactation and season of the year had a significant effect on theproportion of extended lactations. Lactation extension had a beneficial effect on milkyield in full lactation but was detrimental to fertility. The efficiency of lactation extensionwas found to increase with the increasing level of yield in the standard lactation

Effect of extended lactations on cow milk and reproductive performance