INFLUENCE OF THE AGE ON THE DAY OF FIRST CALVING AND THE LENGTH OF CALVING INTERVALS ON THE MILK YIELD OF COWS
Journal title: Folia Pomeranae Universitatis Technologiae Stetinensis Agricultura Alimentaria Piscaria et Zootechnica
Authors: Paweł BORTACKI, Ryszard KUJAWIAK, Ewa Czerniawska-Piątkowska, Jerzy WÓJCIK, Wilhelm GRZESIAK
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