摘要
This study evaluated the effects of a novel silage inoculant containing Saccharomyces cerevisiae strain 3 as a direct fed microbial (DFM) on the ensiling, aerobic stability, and nutrient digestibility of whole-crop corn silage and growth performance of beef cattle. Treatments included uninoculated corn silage (CON) or corn silage inoculated with a mixture of 1.1 × 105 cfu g−1 fresh forage Lactobacillus plantarum and Lactobacillus buchneri (INOC1) or 1.0 × 104 cfu g−1 fresh forage S. cerevisiae strain 3 (INOC2) or a mixture of INOC1 and INOC2 (INOC3). Silage in INOC1 had lower (P = 0.03) proportion of lactate, with acetate (Ac) proportion ranking as INOC1 > INOC3 > INOC2 (P < 0.01). In terminal silage, numbers of lactic acid bacteria were greater (P = 0.05) for INOC1 than CON and INOC2, while yeast counts tended (P = 0.08) to be greater for INOC2 than INOC3 on day 3 of aerobic exposure. Aerobic stability of corn silage was not impacted by inoculation with S. cerevisiae strain 3. Heifers fed INOC2 and INOC3 had lower (P < 0.01) ruminal Ac concentration than those fed CON. Apparent total tract digestibilities of DM, OM, ADF, and NDF were greater (P ≤ 0.03) for heifers fed INOC2 than those fed CON. Growth performance was similar across treatments, excepting DMI as percent of BW tended to be lower (P = 0.08) for INOC2 steers compared to CON steers. These results suggest that S. cerevisiae strain 3 has potential as a component in a fourth generation DFM silage inoculant.
摘要译文
这项研究评估了一种新的含酿酒酵母菌株3作为直接饲喂微生物（DFM）的青贮饲料对整粒青贮玉米青贮饲料的结实，有氧稳定性和养分消化率以及肉牛生长性能的影响。处理包括未接种玉米青贮饲料（CON）或接种1.1×10 5 cfu g −1 新鲜草料的植物乳杆菌和布氏乳杆菌（INOC1）或1.0 ×10 4 cfu g −1 鲜食酿酒酵母菌株3（INOC2）或INOC1和INOC2（INOC3）的混合物。 INOC1中的青贮饲料中乳酸的比例较低（P = 0.03），乙酸盐（Ac）的比例为INOC1> INOC3> INOC2（P <0.01）。在青贮末期，有氧暴露第3天，INOC1的乳酸菌数量大于CON和INOC2（P = 0.05），而酵母数量趋于（P = 0.08）大于INOC3。酿酒酵母菌株3的接种不会影响玉米青贮饲料的好氧稳定性。饲喂INOC2和INOC3的小母牛的瘤胃Ac浓度低于饲喂CON的母牛（P <0.01）。饲喂INOC2的小母牛的DM，OM，ADF和NDF的表观总消化率要高于CON饲喂的小母牛（P≤0.03）。除DMI以外，所有处理的生长性能均相似，DNO除外，因为INOC2牛的体重比CON牛的体重低（P = 0.08）。这些结果表明，酿酒酵母菌株3具有作为第四代DFM青贮饲料孕育剂的组分的潜力。
Jayakrishnan Nair [1]; Shanwei Xu [2]; Brenda Smiley [3]; Hee-Eun Yang [1]; Tim A McAllister [1]; Yuxi Wang [1]. Effects of inoculation of corn silage with Lactobacillus spp. or Saccharomyces cerevisiae alone or in combination on silage fermentation characteristics, nutrient digestibility, and growth performance of growing beef cattle[J]. Journal of Animal Science, 2019,97(12): 4974-4986