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首页> 外文期刊>Canadian Journal of Animal Science >The effect of brown midrib corn silage and dried distillers' grains with solubles on milk production, nitrogen utilization and microbial community structure in dairy cows.
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The effect of brown midrib corn silage and dried distillers' grains with solubles on milk production, nitrogen utilization and microbial community structure in dairy cows.

机译：棕色中肋玉米青贮饲料和干燥的酒糟含可溶物对奶牛的产奶量，氮利用和微生物群落结构的影响。

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Thirty-six Holstein cows (24 multiparous and 12 primiparous), four multiparous were ruminally cannulated, (meanSD, 11135 days in milk; 66476.5 kg body weight) were used in replicated 4*4 Latin squares with a 2*2 factorial arrangement of treatments to investigate the effects of brown midrib ( bm3) and conventional (DP) corn silages, and the inclusion of dried distillers' grains with solubles (DDGS) on milk production and N utilization. Experimental periods were 28 d in length. Treatments were DP corn silage and 0% DDGS; bm3 corn silage and 0% DDGS; DP corn silage and 30% DDGS; and bm3 corn silage and 30% DDGS. Compared with DP hybrid, total tract fiber digestibility was greater for cows consuming bm3 (32.5 vs. 38.11.79%) and DDGS (40.0 vs. 35.21.76%). Milk yield was not affected by treatment, and averaged 30.51.09 kg d -1. Milk protein yield was positively affected by bm3 corn silage and the inclusion of DDGS. An interaction between hybrid and DDGS on milk fat was also observed. The nature of the interaction was such that milk fat was only affected when DDGS were included in the diet and the lowest milk fat was observed when bm3 corn silage was fed (3.46, 3.59, 2.84 and 2.510.10% DP 0% DDGS, bm3 0% DDGS, DP 30% DDGS and bm3 30% DDGS, respectively). As a proportion of the total N consumed, manure N was significantly reduced by the inclusion of bm3 corn silage and DDGS (64.1, 57.1, 52.0, 51.2% for DP 0% DDGS, bm3 0% DDGS, DP 30% DDGS and bm3 30% DDGS, respectively). The Firmicutes:Bacteriodetes ratio in the rumen decreased when cattle consumed DDGS. When cows were fed bm3 corn silage, the population of Fibrobacter sp. tended to represent a larger proportion of the total bacterial population (1.8 vs. 2.30.28% for DP and bm3, respectively) and this shift may have been driven by the fact that bm3 corn silage has less lignin, therefore the cellulose digesting bacteria may have more access to the cellulose.
机译：将三十六头荷斯坦奶牛（24头多胎和12头初乳），4头多头瘤胃瘤胃插管（平均SD，在牛奶中停留11135天;体重66476.5公斤），用于重复的4 * 4拉丁方，采用2 * 2阶乘安排调查棕色中肋（bm3）和常规（DP）玉米青贮饲料的影响，以及将干酒糟与可溶物（DDGS）包括在内对牛奶产量和氮利用的影响。实验期长度为28 d。处理为DP玉米青贮和0％DDGS; bm3玉米青贮饲料和0％DDGS; DP玉米青贮饲料和30％DDGS;和bm3玉米青贮饲料和30％DDGS。与DP杂种相比，消耗bm3（分别为32.5和38.11.79％）和DDGS（40.0和35.21.76％）的母牛的总纤维消化率更高。牛奶产量不受处理的影响，平均为30.51.09 kg d -1。乳蛋白产量受到bm3玉米青贮饲料和DDGS含量的积极影响。还观察到杂种与DDGS在乳脂上的相互作用。相互作用的性质是，仅当饮食中加入DDGS时，乳脂才会受到影响，而饲喂bm3玉米青贮饲料时，乳脂最低（3.46、3.59、2.84和2.510.10％DP 0％DDGS，bm3）分别为0％DDGS，DP 30％DDGS和bm3 30％DDGS）。在总消耗氮中所占的比例中，粪便中的氮含量因bm3玉米青贮饲料和DDGS的添加而显着减少（DP 0％DDGS，bm3 0％DDGS，DP 30％DDGS和bm3 30分别为64.1、57.1、52.0、51.2％ DDGS％）。当牛食用DDGS时，瘤胃中的硬生菌：细菌的比率降低。当母牛饲喂bm3玉米青贮饲料时，Fibrobacter sp。的种群会增加。往往占细菌总数的较大比例（DP和bm3分别为1.8和2.30.28％），并且这种变化可能是由于bm3玉米青贮饲料中的木质素含量较低而引起的，因此纤维素消化细菌可能有更多的纤维素。

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