96 GENETIC STOCKS AND BREEDING METHODS 



Table 27 — Continued 



Name or 

 Symbol 



Synonyms(s) 



Remarks 



JK 



JU 



LCH 



LCL 



LG 



LGW 



LT 

 MA 



MA/MY 



short ear 



Marsh albino, 

 Marsh. Old 

 Buffalo and 

 New Buffalo 

 were branches 

 of strain MA. 

 ND 



inbr (St): 68. genet: aabbppsese. H-V. origin: Strong, 1927, 

 from a cross between J and K. charac: low tumor, resistant to 

 chemical induction of tumors, maintained by: Ao, St. 

 inbr (Fa): 25. genet: aacc. origin: Falconer, from crosses between 

 Goodale's and MacArthur's large strains, Bateman's high lactation 

 strain, and stocks of various mutants with about 50% of C57BL/Fa 

 ancestry, maintained by: Fa. 



inbr (St): 75. genet: A w A w c ch c ch . origin: Strong, about 1926 

 from a group of unpedigreed mice, charac: low mammary gland 

 tumors, some lymphoblastomas, retinal opacity, maintained by: St. 

 inbr (We): 31. genet: Inln. origin: from MacArthur stock (out- 

 bred) obtained from Butler, 1949. Selected for high total leucocyte 

 count, with b x s mating, charac: leucocyte count 11,000/mm 3 . 

 Sex ratio 50% <$£. Mean litter size at weaning, 7.4. Leucocyte 

 count rose from 8800 in F x to 18,000 in F 13 , and dropped steadily to 

 present level, maintained by: We. 



inbr (We): 31. genet: bblnln. origin: see LCH. Selected for low 

 count, charac: leukocyte count 3,700/mm 3 . Sex ratio, 48% $<$, 

 mean litter size at weaning, 6.6. No significant change in leucocyte 

 count since F n . maintained by: We. 



inbr (Rr) : 18. genet: a l a l cc. origin: Goodale, to Runner in 1948 

 (no record of previous inbreeding), charac: large body size, lym- 

 phatic leukemia, low incidence of otocephaly, maintained by: Rr. 

 inbr (Gw) : 59. genet: aasisi. origin: "silver" strain from English 

 fancier, to Dunn, to MacDowell, to Iowa State. Inbred at Iowa State. 

 charac: susceptible to Salmonella typhimurium. Unreliable breeder- 

 maintained by: Gw. 



inbr (Jax) : 57. genet: A w A w ss. H-2". origin: Dunn, to Scott, to 

 Dickie, 1947; to Jax, 1949; at F 33 . charac: some mammary tumors. 

 maintained by: Jax, Jb. 

 inbr (Sn): G12F13. 



inbr (Icrc) : 37. genet: albino, origin: albino stock from a hybrid 

 (XIX x XLII)F! $, started by Dobrovolakaia-Zavadskaia in 1940, 

 designated L(C). Breeding stock at F 17 sent to Tata Institute in 

 Bombay in 1948, to Indian Cancer Research Centre in 1952, desig- 

 nated L(P). Other stock to Busto Arsizio in 1948. charac: no 

 spontaneous mammary tumors. High incidence following methyl- 

 cholanthrene treatment. No evidence of presence of MTI. main- 

 tained by: Bax, Icrc. 



inbr (Ch): 37. genet: B u B lt . origin: dominant allele of brown 

 from MacDowell in 1950. maintained by: Ch. 



inbr (Jax) : 47. genet: cc. H-2 k . origin: Marsh's strain 3. Started 

 from pair of mice from Lathrop-Loeb colony; 32 generations of cousin 

 matings by Marsh, to W. S. Murray who started b x s matings, to 

 Warner, to Jax in 1947 at F 20 + . charac: high mammary tumor. 



MAINTAINED BY: Hu, Jax, Ms, S, Sp. 



inbr (Jax): 47. genet: cc. H-2 k . origin: Murray and Warner 

 separated this line from MA after 37 b x s generations. Warner to 

 Jax in 1948 at F 24 . charac: low incidence of mammary tumor. 



MAINTAINED BY: Hu, Jax, Sp. 



