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Drogemuller, C., H. Hamann and O. Distl, 2001. Candidate gene markers for litter size in different German pig lines. J. Anim. Sci., 79: 2565-2570.
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Harney, J.P., T.L. Ott, R.D. Geisert and F.W. Bazer, 1993. Retinol-binding protein gene expression in cyclic and pregnant endometrium of pigs, sheep and cattle. Biol. Reprod., 49: 1066-1073.
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Rothschild, M.F., L. Messer, L. Day, R. Wales, T. Short, O. Southwood and G. Plastow, 2000. Investigation of the Retinol-Binding Protein 4 (RBP4) gene as a candidate gene for increased litter size in pigs. Mamm. Genome, 11: 75-77.
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Terman, A., 2005. Effect of the Polymorphism of prolactin receptor PRLR and leptin LEP genes on litter size in polish pigs. J. Anim. Breed. Genet., 122: 400-404.

Terman, A., M. Kmiec, D. Polasik and K. Pradziadowicz, 2006. Retinol binding protein 4 gene and reproductive traits in pigs. Arch. Tier. Dummerstorf, 50: 181-185.
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Wang, X., A.G. Wang, J. Fu and H. Lin, 2006. Effects of ESR1, FSHB and RBP4 genes on litter size in large white and landrace herd. Arch. Tier. Dummerstorf, 49: 64-70.
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