Studying the effect of the genotypes of the prolactin gene (PRL) on the productive performance of Holstein cows. University of Thi-Qar Journal of agricultural research, [S. l.], v. 10, n. 2, p. 43–51, 2021. DOI: 10.54174/utjagr.v10i2.132. Disponível em: https://jam.utq.edu.iq/index.php/main/article/view/132.. Acesso em: 30 apr. 2024.