Plansky V, Hristov K. SEASON OF DELIVERY, AGE OF FIRST FERTILISATION AND MILKING YIELD DURING THE FIRST LACTATION PERIOD OF HEIFERS. Tradit. Mod. Vet. Med. [Internet]. 2020 Jun. 24 [cited 2026 Aug. 27];5(1):53-7. Available from: https://scij-tmvm.com/index.php/pub/article/view/117