Ewa Czerniawska-Piatkowska, Iwona Szatkowska, Daniel Zaborski, Wilhelm Grzesiak, Sara Tabor-Osinska, Malgorzata Wasielewska, Witold S. Proskura, Wojciech Kruszynski and Edward Pawlina, 2021. Single Nucleotide Polymorphism in the Promoter Region of the IGF-1 Gene is Associated with Milk Production in Holstein and Jersey Cattle – Is the Aspect of Present Research Still Relevant in the Era of Genomic Selection? Pakistan J. Zool., 53: 2295-2303. DOI: https://dx.doi.org/10.17582/journal.pjz/20191208211212