4Georges M, Drinkwater R, King T. et al. Mierosatellite mapping of a gene affecting horn development in Bos tau-rus [J]. Nature Genetics, 1993,4,206-210.
5Brenneman R A,Davis S K,Sanders J O,et al. The polled locus maps to BTA 1 in a Bos indicus X Bos taurus cross [J]. Journal of Heredity, 1996,87 : 156-161.
6Sehmutz S M, Marquess F L, Berryere T G, et al. DNA marker-assisted selection of the polled condition in Charol- ais cattle[J]. Mamm Genome,1995,6(10):710-713.
7Montgomery G W, Henry H M, Dodds K G, et al. Map- ping the Horns( Ho)locus in sheep: a further locus control-ling horn development in domestic animals[J]. Hered, 1996,87:358-363.
8Cargill E J, Nissing N J,Grosz M D. Single nucleotide pol- ymorphisms concordant with the horned/polled trait in Holsteins[J]. BMC Research Notes, 2008,1 : 128-137.
9Wohlke A, Pommerien N, Distl O. A synaptojanin 1 (SYNJ1) single nucleotidepolymorphism not responsible for polledness in German Holstein, Limousin, Charolais andPinzgauer cattle[J]. Anim Genet, 2010,41(3):335-341.
