Maamouri Omar, Ben Salem Mondher
National Institute of Agronomic Research of Tunisia University of Carthage Manzah Tunisia.
Food Sci Nutr. 2021 Mar 22;9(5):2762-2767. doi: 10.1002/fsn3.2238. eCollection 2021 May.
This study was carried out to predict the effects of yeast culture on growth, intake, and digestibility in vitro of calves for fattening. The trial involved 16 fattening calves divided into two homogeneous groups ( = 8), based on the initial body weight (414 ± 25.1 kg and 416 ± 24.4 kg) ( = .96) for the control group (C) and the experimental group (Y). The ration is wheat straw and concentrate. Group Y additionally receives a quantity of 10 g/calf/day of yeast culture. The quantity of feed was 5 kg DM/calf/day of wheat straw and 8kg DM/calf/day of concentrate. This trial lasted 112 days. We measure the weights every two weeks with a cattle scale and also the rejected quantities of wheat straw at each measure. A significant increase ( < .01) in total average daily gain (adgT) during the trial was observed at 200g/calf. In addition, an increase ( < .01) in the final weight gain (FWG) was observed at 19 kg/calf for group Y compared with group C. Intake does not vary with the yeast culture. The feed conversion rate (FCR) was lower for group Y compared with group C (7.8 ± 0.2 versus 9.6 ± 0.5, < .01). We observed a notable increase in ruminal pH for group Y compared with group C.
本研究旨在预测酵母培养物对育肥牛犊生长、采食量和体外消化率的影响。试验涉及16头育肥牛犊，根据初始体重（对照组（C）为414±25.1千克，实验组（Y）为416±24.4千克）（P = 0.96）分为两个同质组（每组8头）。日粮为小麦秸秆和精料。Y组额外每头犊牛每天添加10克酵母培养物。饲料量为每头犊牛每天5千克干物质的小麦秸秆和8千克干物质的精料。本试验持续112天。我们每两周用牛秤测量体重，并测量每次测量时小麦秸秆的废弃量。试验期间，总平均日增重（adgT）显著增加（P < 0.01），为每头犊牛200克。此外，与C组相比，Y组的最终体重增加（FWG）增加（P < 0.01），为每头犊牛19千克。采食量不受酵母培养物的影响。Y组的饲料转化率（FCR）低于C组（7.8±0.2对9.6±0.5，P < 0.01）。与C组相比，我们观察到Y组瘤胃pH值显著升高。
