내한 조숙성 이탈리안 라이그라스 신품종 '코스피드'

Abstract

This experiment was carried out to breed the cold-tolerant variety of Italian ryegrass (Lolium multiflorum Lam.) in Grassland and Forage Crops Division, National Institute of Animal Science, RDA, Cheonan from 1999 to 2005. New variety, `Kospeed` is a diploid variety with green in leaf color, and has semi-erect and erect growth habit in late autumn and early spring, respectively. `Kospeed` was on 1 May in heading date as a early-maturing variety. Also `Kospeed` was wider by 0.2mm in flag leaf width, longer by 1cm in flag leaf length and shorter by 1cm in plant length than those of `Florida 80`, respectively. Stem width of `Kospeed` was similar to that of `Florida 80` and `Hwasan 101`. Cold tolerance of `Kospeed` was better than that of `Florida 80`. Dry matter (DM) yield (13,257kg/ha) of `Kospeed` was similar to that of `Florida 80`. In vitro dry matter digestibility (IVDMD) and total digestible nutrient (TDN) of `Kospeed` were 73.2% and 65.3% which are 2.1% and 1.7% higher than those of `Florida 80`, respectively. Acid detergent fiber(ADF) and neutral detergent fiber (NDF) of `Kospeed` were 29.1% and 53.1% which are 2.1% and 2.3% lower than those of `Florida 80`, respectively.