TY - RPRT TI - Age-related differences in semen quality in Holstein-Friesian bulls: a paired within-bull comparison of early and mature reproductive stages. AU - Szymon Bugaj AU - Ewa Sell-Kubiak AU - Piotr Pawlak AU - Zofia E Madeja AU - Marta Podralska AU - Ewelina Warzych AU - Dorota Lechniak PY - 2026 DO - 10.1016/j.anireprosci.2026.108290 UR - https://pubmed.ncbi.nlm.nih.gov/42492127/ ID - 42492127 ER -