Selection for hybrids with greater

Selection for hybrids with greater starch and NDF digestibility may be beneficial for dairy producers. The objective of this study was to determine the effect of feeding a TMR containing a floury-leafy corn silage hybrid (LFY) compared with a brown midrib corn silage hybrid (BMR) for intake, lactation performance, and total-tract nutrient digestibility in dairy cows. Ninety-six multiparous Holstein cows, 105 ± 31 d in milk at trial initiation, were stratified by DIM and randomly assigned to 12 pens of 8 cows each. Pens were randomly assigned to 1 of 2 treatments, BMR or LFY, in a completely randomized design; a 2-wk covariate period with cows fed a common diet followed by a 14-wk treatment period with cows fed their assigned treatment diet. Starch digestibilities, in situ, in vitro, and in vivo, were greater for LFY compared with BMR; the opposite was observed for NDF digestibility. Cows fed BMR consumed 1.7 kg/d more dry matter than LFY. Although, actual-, energy-, and solids-corrected milk yields were greater for BMR than LFY, feed conversions (kg of milk or component-corrected milk per kg of DMI) did not differ. Fat-corrected milk and milk fat yield were similar, as milk fat content was greater for cows fed LFY (4.05%) than BMR (3.83%). Cows fed BMR had lower milk urea nitrogen concentration, but greater milk protein and lactose yields compared with LFY. Body weight change and condition score were unaffected by treatment. Total-tract starch digestibility was greater for cows fed the LFY corn silage; however, dry matter intake and milk and protein yields were greater for cows fed the BMR corn silage. Although total-tract starch digestibility was greater for cows fed the LFY corn silage, feed efficiency was not affected by hybrid type due to greater dry matter intake and milk and protein yields by cows fed the BMR corn silage.

ผลลัพธ์ (จีน) 2:

选择对混合动力车有更大的淀粉和NDF消化率可能有利于乳品生产商。本研究的目的是确定供给的TMR含有粉状-叶菜玉米青贮杂交体（LFY）与棕色脉玉米青贮杂交（BMR）用于进气，泌乳性能相比的效果，并在乳制品总-道营养物质的消化率奶牛。九十个荷斯坦奶牛，105±31日在审判开始d。在牛奶，是由DIM分层和随机分配到12笔8头奶牛每一个。笔被随机分配到1 2治疗，BMR或LFY，在一个完全随机设计; 2周协期限与牛喂食普通饲料接着是14周的治疗期间与奶牛饲喂其指定的治疗饮食。淀粉消化率，原位，在体外和体内，都大的LFY与BMR比较; 观察到NDF降解相反。奶牛饲喂BMR消耗1.7千克/ d的干物质比LFY。虽然，actual-，能量，和固体校正乳产率越大BMR比LFY，饲料转化率（公斤牛奶或每公斤的DMI分量校正乳）没有差异。脂肪校正乳和乳脂产量是相似的，因为牛奶中的脂肪含量是更大的奶牛饲喂LFY（4.05％），比基础代谢率（3.83％）。奶牛饲喂BMR有较低的乳尿素氮浓度，但大于乳蛋白和乳糖的产量与LFY比较。体重变化和状况评分均不受处理。总-道淀粉的消化率是更大的奶牛饲喂LFY玉米青贮; 然而，干物质采食量和牛奶蛋白产量均大于奶牛饲喂BMR玉米青贮。虽然总-消化道淀粉消化率是更大的奶牛饲喂LFY玉米青贮，饲料效率并没有受到应有更大的干物质采食量和牛奶蛋白产量提高奶牛混合型喂养BMR玉米青贮。

ผลลัพธ์ (จีน) 3:

对于更大的淀粉和NDF消化率杂种的选择可能有利于乳制品生产商。本研究的目的是确定TMR喂养含粉多叶玉米青贮混合效果（LFY）与褐色中脉玉米青贮混合比（BMR）的摄入，泌乳性能，奶牛和总消化道养分消化率。九零六荷斯坦奶牛，105±31 D的牛奶在试验开始，分层的模糊和随机分配到12笔的8头奶牛。钢笔被随机分配到1个处理2，BMR和LFY，在一个完全随机设计；用牛2周协期喂养普通饲料和随后14周的治疗期奶牛饲喂分配给他们的饮食治疗。淀粉的消化率，原位，体外，体内，更大的LFY与BMR为NDF消化率；观察到的是相反的。奶牛饲喂基础代谢消耗1.7 kg干物质多，LFY。虽然，实际，能量，和固体校正奶产量分别为BMR比LFY大，饲料转化率（公斤牛奶或构件校正奶每公斤DMI）没有差异。脂肪校正奶产量和乳脂肪是相似的，因为牛奶中的脂肪含量为饲喂LFY大（4.05%）比基础代谢率（3.83%）。奶牛饲喂基础代谢率较低的牛奶中尿素氮的浓度，但更大的乳蛋白和乳糖产量相比，LFY。体重变化及病情评分均未受治疗影响。全肠道淀粉消化率更大的奶牛饲喂青贮玉米粉；然而，干物质采食量和牛奶和蛋白质产量更大的奶牛饲喂青贮玉米的BMR。虽然全肠道淀粉消化率更大的奶牛饲喂玉米青贮饲料效率的LFY，不是由于更大的干物质摄入量的混合型和牛奶和蛋白质产量的影响通过奶牛喂青贮玉米
BMR。