Zhang Yawei, Zhao Xiangwei, Chen Wanbao, Zhou Zhenming, Meng Qingxiang, Wu Hao
State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China.
Yishui Animal Husbandry Development and Promotion Center, Shandong 276400, China.
Animals (Basel). 2019 Sep 17;9(9):695. doi: 10.3390/ani9090695.
This study aimed to investigate the effect of applying various silage additives to whole corn crops at ensiling on growth performance, rumen fermentation, and blood physiology in growing-finishing bulls. Sixty Simmental × Yellow Cattle crossbred bulls were blocked by initial body weight (BW; 324.0 ± 5.4 kg) into 15 blocks. Animals in each block were randomly assigned to one of four diets formulated based on the following corn silage: control (CON), inoculated with complex lactic acid bacteria (CLB), ensilaged with mixed organic acid salts (MS), and ensilaged with CLB and MS (CLBMS). The feeding experiment lasted over 155 days, with an additional 7 days for adaptation. The results showed that bulls fed CLB-inoculated silage had greater ( < 0.05) daily dry matter intake than the other groups. The experimental treatment had no significant effect on average daily gain ( = 0.33) and feed-to-gain ratio ( = 0.13), although bulls fed CLB-inoculated silage had a larger numeric average daily gain. All additive-treated silage increased ruminal NH-N content ( < 0.05) and reduced the acetate-to-propionate ratio ( < 0.05) of bulls compared with the control group. Bulls fed CLB-inoculated silage had a lower ruminal pH value ( < 0.05) than that of the other groups. Compared with the control group, bulls fed CLB-inoculated silage had greater blood cholesterol, albumin, and urea nitrogen ( < 0.05). Blood physiological responses were similar in bulls fed MS-treated and control silage, whereas those in cattle fed CLBMS-treated silage were between bulls fed CLB- and MS-treated silages and more similar to the former. Taking animal performance and cost effectiveness into consideration, the application of CLB alone to whole corn crops at ensiling appears to be a better choice compared with the application of either MS alone or both of them together.
本研究旨在探讨在青贮时对全株玉米作物应用各种青贮添加剂，对生长育肥牛的生长性能、瘤胃发酵和血液生理学的影响。60头西门塔尔×黄牛杂交公牛按初始体重（BW；324.0±5.4千克）进行分组，分为15个区组。每个区组的动物被随机分配到基于以下玉米青贮料配制的四种日粮之一：对照组（CON）、接种复合乳酸菌（CLB）、添加混合有机酸盐（MS）青贮以及CLB和MS青贮（CLBMS）。饲养试验持续155天以上，另有7天用于适应期。结果表明，饲喂接种CLB青贮料的公牛的日干物质摄入量高于其他组（P<0.05）。实验处理对平均日增重（P = 0.33）和料重比（P = 0.13）无显著影响，尽管饲喂接种CLB青贮料的公牛的数字平均日增重较大。与对照组相比，所有添加添加剂处理的青贮料均提高了公牛瘤胃NH₃-N含量（P<0.05）并降低了乙酸与丙酸比例（P<0.05）。饲喂接种CLB青贮料的公牛的瘤胃pH值低于其他组（P<0.05）。与对照组相比，饲喂接种CLB青贮料的公牛的血液胆固醇、白蛋白和尿素氮含量更高（P<0.05）。饲喂MS处理青贮料和对照青贮料的公牛的血液生理反应相似，而饲喂CLBMS处理青贮料的公牛的血液生理反应介于饲喂CLB处理和MS处理青贮料的公牛之间，且更类似于前者。综合考虑动物性能和成本效益，与单独应用MS或两者一起应用相比，在青贮时对全株玉米作物单独应用CLB似乎是更好的选择。
