关键词: 初次刈割时间点, 再生燕麦, 倒伏率, 乳酸菌, 青贮

Abstract: To investigate the impact of initial cutting time on lodging rate,silage fermentation quality,and nutritive value of regrown forage oats (Avena sativa L.),an experiment was conducted by using ‘Baylor’ (B) and ‘Monica’ (M) oats as plant material. The control group did not undergo initial cutting (B0/M0),while the experimental groups were initially cut at early (B1/M1),mid (B2/M2),and late (B3/M3) tillering stages. After regrowth,all plants were harvested at the milk-ripe stage,and lodging rates were recorded. Silage was prepared with mixed lactic acid bacteria additives,with two treatments:control (C,without additive) and J (adding 3% of 10⁶ cfu·mL^-1 lactic acid bacteria). The silage was fermented at room temperature for 60 days,and the nutritional and fermentation qualities of the regrown oats were analyzed. The results indicated that delayed initial cutting significantly reduced the lodging rate of regrown ‘Baylor’ and ‘Monica’ oats (P<0.01). Among the silage from regrown oats,the B3+J group exhibited the highest water-soluble carbohydrate content (1.27%),the lowest pH (3.83),and the lowest ammonia nitrogen to total nitrogen ratio,they were all significantly different (P<0.01). Therefore,cutting ‘Baylor’ and ‘Monica’ oats at the late tillering stage can reduce lodging rates,and inoculating with lactic acid bacteria significantly improves the silage quality of regrown ‘Baylor‘ oats,with limited improvement for ‘Monica’ oats.

Key words: Initial cutting time point, Regenerated oats, Lodging rate, Lactic acid bacteria, Silage