玉米青贮饲料(CS)是最常见的饲料,用于喂食乳制品奶牛,其包含率通常约为20-40%的饮食DM。近年来,已经提出了使用玉米粉(SDL)作为CS的替代品。玉米SDL由一种方法产生,该方法包括将玉米厂粉碎成异常的长部分并压碎玉米粒。本研究的目的是提供有关饲养SDL与CS对挤奶性能和瘤胃微生物生态系统的影响的额外数据。在同一天收获了212000kg的整个植物,并在两个相邻的掩体筒仓中达到了〜100,000kg。使用26mm(SDL)的理论切割(LOC)的理论长度(SDL)的理论长度加工一个筒仓,并使用16mm LOC(CS)收获其它。玉米植物以100ml /吨的速率处理,商用植物(Magniva Platinum 1,Lallemand,France)提供150000cfu的Lactobacillus Hilgardii CNCM I-4785和L.Buchneri NCIMB 40 788的150000cfu。克新鲜的材料。六十哺乳期荷斯坦牛(BW 648±66.6kg; 44.4±9.9kg / d牛奶产率; 155±75次暗)分为两组,并喂相同的总混合配给(15.2%CP,DM上的30.8%NDF。基础)含有32.7%的Cs或32.7%SDL,在DM的基础上为7周。 Individual feed intake and milk production and composition were monitored daily. Also, at 50 d of study (completion), a rumen sample was obtained from every cow, and DNA extracted and submitted to high-throughput sequencing to evaluate potential changes in rumen microbiota. Data were analyzed using a mixed-effects model which accounted for the fixed effects of treatment, week of study, and their two-way interaction, plus the random effect of cow. Cows on SDL had a greater DMI toward the end of the study, but milk yield and composition were not affected by dietary treatments. As result, feed efficiency was greater in cows fed CS than in those fed SDL toward the end study. There were no major changes in the relative abundances of the different microbial populations in the rumen between both groups of cows. It is concluded that SDL increases DMI of cows, but this increase is not followed by improvements in production.

参考

PubMed.