Chu M.X., Wang S.C.Y.E. and Fang L. (2004). Association between PCR-SSCP of growth differentiation factor 9 genes and high prolificacy in Small Tail Han sheep. Anim. Biotechnol. 15, 111-120.
Chu M.X., Liu Z.H., Giao C.L., He Y.Q., Fang L., Ye S.C., Chen G.H. and Wang G.Y. (2007). Mutations in BMPR-IB and BMP-15 genes are associated with litter size in Small Tailed Han sheep (Ovis aries). J. Anim. Sci. 85, 324-330.
Davis G.H., McEwan J.C., Fennessy P.F., Dodds K.G. and McNatty K.P. (1992). Infertility due to bilateral ovarian hypoplasia in sheep homozygous (FecXI, FecXI) for the Inverdale prolificacy gene located on the X chromosome. Biol. Reprod. 46, 636-640.
Davis G.H., McEwan J.C., Fennessy P.F., Dodds K.G. and Farquhar P.A. (1991). Evidence for the presence of a gene influencing ovulation rate on the X chromosome of sheep. Biol. Reprod. 44, 620-624.
Davis G.H., Balakrishnan L., Ross I.K., Wilson T., Galloway M., Lumsden B.M., Hanrahan J.P., Mullen M.X., Mao Z., Wang G.L., Zhao Z.S., Robinson J.J., Mavrogenis A.P., Papachristoforou C., Peter C., Baumung R., Cardyn P., Boujenane I., Cockett N.E., Eythorsdottir E., Arranz J.J. and Notter D.R. (2006). Investigation of the Booroola (FecB) and Inverdale (FecXI) mutations in 21 prolific breeds and strains of sheep sampled in 13 countries. Anim. Reprod. 92, 87-96.
Galloway S.M., McNatty K.P., Cambridge L.M., Laitinen M.P. E., Juengel J.L., Jokiranta T.S., McLaren R.J., Luiro K., Dodds K.G., Montgomery G.W., Beattie A.E., Davis G.H. and Ritvos O. (2000). Mutations in an oocytederived growth factor gene (BMP15) cause increased ovulation rate and infertility in a dosage-sensitive manner. Nature. 25, 279-283.
Guan F., Liu S.R., Shi G.Q., Ai J.T., Mao D.G. and Yang L.G. (2006). Polymorphism of FecB gene in nine sheep breeds or strains and its effects on litter size, lamb growth and development. Acta Genetic. Sci. 33, 117-124.
Hanrahan J.P., Gergan S.M., Mulsant P., Mullen M., Davis G.H., Powell R. and Galloway S.M. (2004). Mutations in the genes for oocyte derived growth factors GDF9 and BMP15 are associated with both increased ovulation rate and sterility in Cambridge and Belclare Sheep (Ovis aries). Biol. Reprod. 70, 900-909.
Hsueh A.J., McGee E.A., Hayashi M. and Hsu S.Y. (2000). Hormonal regulation of early follicle development in the rate ovary. Mol. Cell. Endocrinol. 163(1), 95-100.
Javanmard A., Azadzadeh N. and Esmailizadeh A. (2011). Mutations in bone morphogenetic protein 15 and growhdiffirentiation factor 9 genes are associated with increased litter size in fat-tailed sheep breeds.Vet. Res. Commun. 35, 157-167.
Juengel J.L., Hudson N.L., Whiting L. and McNatty K.P. (2004). Effects of immunization against bone morphogenetic protein 15 and growth differentiation factor 9 on ovulation rate, fertilization, and pregnancy in ewes. Biol. Reprod. 70, 557-561.
Laitinen M., Vuojolainen K., Jaatinen R., Ketola I., Aaltonen J., Lehtonen E., Heikinheimo M. and Ritvos O. (1998). A novel growth differentiation factor 9 (GDF9) related factors is co-expressed with GDF9 in mouse oocytes during folliculogenesis. Mech. Dev. 78, 135-140.
Liao W.X., Moore R.K. and Shimasaki S. (2004). Functional and molecular characterization of naturally occurring mutations in the oocytesecreted factors bone morphogenetic protein-15 and growth and differentiation factor-9.J. Boil. Chem. 17, 17391-17396.
McNatty K.P., Jungel J.L., Reader K.L., Lun S., Myllymaa S., Lawrence S.B., Western A., Meerasahib M.F., Mottershead D.G., Groome N.P., Ritvos O. and Laitinen M.P. (1997). Bone morphogenetic protein 15 and growth differentiation factor 9 co-operate to regulate granulose cell function in ruminants. Reprod. 129, 481-487.
McNatty K.P., Moore L.G., Hudson N.L., Quirke L.D. and Lawrence S.B. (2004). The oocyte and its role in regulating ovulation rate: anew paradigm in reproductive biology. Reprod. 128, 379-386.
SAS Institute. (2002). SAS®/STAT Software, Release 6.00. SAS Institute, Inc., Cary, NC.
Tavakkolian J. (2000). An Introduction to Genetic Resources of Native Farm Animals in Iran. Animal Science Research Institute, Kraj, Iran.