Registration of ‘Windsor’ Cicer Milkvetch

from 11 sources (1) was treated with colchicine to induce chromosome doubling. Mixaploid plants identified prior to anthesis by chromosome counts on microsporocytes were allowed to interpollinate, producing =50% tetraploid progeny. Half-sib progeny rows were established from 109 of these tetraploid plants, and the two most fertile plants in each progeny row were allowed to intercross with selected plants from other halfsib progenies. Seed from 57 of the more fertile progenies were used to establish a three replicate, spaced-plant progeny nursery near Swift Current, in 1972. From 1973 to 1975, data were collected on plant vigor, fertility, seed yield, and seed quality. Ten clones that had the highest seed yields in 1974 and 1975 were included in a synthetic designated Se RN3761. These 10 clones were derived from the diploid strains, Mandan 1495, Mandan 2551-5, 5115-1539-3-N.D., S-2450 (Agriculture Canada, Research Station, Saskatoon, SK, P-210-Washington, and P-211-Washington (SCS Plant Materials Center). (1)Evaluated in a 24-replicate depth-of-seeding greenhouse test, Tetracan had higher (P < 0.05) emergence from a 4.5-cm soil depth than did the diploid cultivars Swift, Mayak, and Cabree, which indicates a marked improvement in establishment vigor (2). In 19 regional trials, Tetracan did not differ (P > 0.05) from Swift in dry matter yield. Seed yields of Tetracan averaged 315 kg ha~' for 39 regional trials. The mean seed yield of Tetracan is comparable to that of Swift (3). Tetracan was compared with a number of diploid strains under grazing by yearling steers (Bos taurus) from 1981 to 1984 at Swift Current. No significant (P > 0.05) differences were noted between Tetracan and the diploid strains in daily gain per animal, total gain per animal, total gain per hectare, grazing days per animal, or grazing days per hectare. In a replicated cafeteria-style grazing test over 3 yr, no significant (P > 0.05) difference was detected in cattle grazing preference between Tetracan and diploid strains. Tetracan is adapted to the same environments as Swift, Mayak, and Cabree. Tetracan can be distinguished from such diploid cultivars by a larger seed and inflorescence, and a wider leaf. Tetracan also has heavier seeds (456 mg 100 seedsP < 0.05) than Swift, Mayak, and Cabree (276, 243, and 289 mg 100 seeds,respectively). Breeder seed will be produced by Agriculture Canada at the Research Station, Swift Current, SK, and the Seed Increase Unit, Experimental Farm, Indian Head, SK. The multiplication and distribution of foundation and certified seed will be handled by SeCan Association, 200-57 Auriga Dr., Nepean, ON, K2E 8B2, Canada.