1Bacon L D, Smith E J, Crittenden L B, et al. Association of the slow feathering(K) and an endogenous viral(ev21) gene on the Z chromosome of chickens[J]. Poult Sci, 1988, 67: 191-197.
2Smith E J, Fadly A M. Influence of congenital transmission of endogenous virus-21 on the immune response to avian leukosis virus infection and the incidence of tumors in chickens[J]. Poult Sci, 1988, 67: 1674-1679.
3Iraqi F, Smith E J. Determination of the zygosity of ev21-k in late-feathering male white leghorns using the polymerase chain reaction[J]. Poult Sci, 1994, 73: 939-946.
4Liu W Y, Zhao C J, Li J Y. A Non-invasive and inexpensive per-based procedure for rapid sex diagnosis of chinese gamecock chicks and embryos[J]. J Anim Vet Adv, 2010, 9(5): 962-970.
5Michele H, Tixier-Boichard M. Screening chichens for endogenous virus ev21 viral element by the polymerase chain reaction [J]. Poult Sci, 1994, 73: 1612-1616.
6Elferink M G, Vallee A A A, Jungerius A P, et al. Partial duplication of the PRLR and SPEF2 genes at the late feathering locus in chicken[J]. BMC Genomics, 2008, 9: 391.
7Tixier-Boiehard M, Boulliou-Robic A, Morisson M, et al. A Deleted retroviral insertion at the ev21-k complex locus in indonesian chickens[J]. Poult Sci, 1997, 76: 733-742.
8Smith E J, Levin I. Application of a locus-specific DNA hybridization probe in the analysis of the slow-feathering endogenous virus complex of chickens [J]. Poult Sci, 1991, 70 (9): 1957-1964.
9Boulliou A, Le Pennec J P, Hubert G, et al. The endogenous retroviral ev21 locus in commercial chicken lines and its relationship with the slow-feathering phenotype (K) [J]. Poult Sci, 1992, 71 (1): 38-46.
10Serebrovsky A S. Crossing-over involving three sex - linked genes in chickens[J]. Amer Nat, 1922, 56: 571-572.