1. Alfonso E, Rojas R, Herrera JG, Ortega ME, Lemus C, Ruiz J, Pinto R, Gómez H (2012) Polymorphism of the prolactin gene (Prl) and its relationship with milk production in American Swiss cattle. Afr J Biotechnol 11:7338–7343
2. Alipanah M, Kalashnikova LA, Rodionov GV (2008) Kappacasein and PRL-Rsa I genotypic frequencies in two Russian cattle breeds. Arch de Zootec 57(218):131–138
3. Aravindakshan TV, Venkatachalapathy RT, James SP, Kurien E, Iype S (2004) Polymorphism of the prolactin gene locus in Vechur and other dwarf (Kassargode) cattle of Kerala detected by PCR-RFLP. Indian J Dairy Sci 57(4):246–249
4. Borenstein M, Hedges LV, Higgins JPT, Rothstein HR (2009) Introduction to meta-analysis. Wiley, Chichester
5. Bukhari S, Khan NN, Gupta P, Das A, Raher GA, Chakraborty D, Pandey A (2013) Biology prolactin gene polymorphism and its associations with milk production traits in Frieswal cow. Int J Mol Zool 3(3):10–13