Petit H V, Alary S
Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, Lennoxville QC, Canada.
J Dairy Sci. 1999 May;82(5):1004-7. doi: 10.3168/jds.S0022-0302(99)75320-8.
A 1.5-yr study was designed to determine the effects of feeding isonitrogenous and isoenergetic concentrates based on naked oats, corn, or a mixture (50: 50 on as-fed basis) of naked oats and corn on milk yield and composition. In vitro dry matter (DM) digestibility and ruminal degradabilities of DM, N, and starch of naked oats were compared with those of covered oats. Twenty-seven multiparous Holstein cows were blocked by similar calving date and assigned to 9 replicates. All cows were fed a mixture of grass silage, protein supplement, concentrate, and a vitamin and mineral mix for ad libitum intake. Treatment diets were fed from 3 to 36 wk of lactation. Milk yield and composition, yield of 4% fat-corrected milk, and yield of protein and fat were similar among treatments. Ruminal effective degradabilities of DM were higher for naked oats than for covered oats, but the ruminal degradabilities of crude protein and starch were similar. The rapidly degradable fractions of DM, crude protein, and starch were greater for naked than covered oats; the potentially degradable fractions were less. In vitro DM digestibility of naked oats was higher than was that of covered oats. Naked oats may be a good alternative to corn for milk yield.
一项为期1.5年的研究旨在确定以裸燕麦、玉米或裸燕麦与玉米的混合物（以饲喂基础计为50:50）为基础的等氮等能量浓缩饲料对牛奶产量和成分的影响。将裸燕麦的体外干物质（DM）消化率以及DM、N和淀粉的瘤胃降解率与带壳燕麦进行了比较。27头经产荷斯坦奶牛按相近产犊日期进行分组，分为9个重复组。所有奶牛均饲喂青贮草、蛋白质补充料、浓缩饲料以及维生素和矿物质混合物，自由采食。在泌乳第3至36周饲喂试验日粮。各处理组之间的牛奶产量和成分、4%脂肪校正乳产量以及蛋白质和脂肪产量相似。裸燕麦的DM瘤胃有效降解率高于带壳燕麦，但粗蛋白和淀粉的瘤胃降解率相似。裸燕麦的DM、粗蛋白和淀粉的快速降解部分高于带壳燕麦；潜在降解部分则较低。裸燕麦的体外DM消化率高于带壳燕麦。对于产奶量而言，裸燕麦可能是玉米的一个良好替代品。
