The selection and comparison of different growth models for describing weight gain of piglets raised in organic farming is investigated by using the Akaike’s Information Criterion (AIC). In total, 49,699 data points ...The selection and comparison of different growth models for describing weight gain of piglets raised in organic farming is investigated by using the Akaike’s Information Criterion (AIC). In total, 49,699 data points of 5188 piglets recorded between 2007 and 2013 were considered. From the day of birth, up to 40 days (i.e. until weaning) the model of von Bertalanffy was favored by the AIC. This model is with 60.32% more likely to truly reflect reality than any other of the analyzed models. Up to 105 days, the two-linear model was favored by the AIC (probability 99.75%). The intersection point of the two-linear model was calculated by 53.8 days, which fitted well to the actual change in the food situations.展开更多
本试验旨在整理以产肠毒素大肠杆菌及脂多糖作为损伤模型的断奶仔猪研究数据并进行Meta分析,探究添加益生菌制剂对损伤处理断奶仔猪生长性能的影响。通过检索中国知网、PubMed、Web of Science、Science Direct数据库,筛选益生菌添加对...本试验旨在整理以产肠毒素大肠杆菌及脂多糖作为损伤模型的断奶仔猪研究数据并进行Meta分析,探究添加益生菌制剂对损伤处理断奶仔猪生长性能的影响。通过检索中国知网、PubMed、Web of Science、Science Direct数据库,筛选益生菌添加对损伤处理断奶仔猪生长性能影响的随机对照试验,选择同时具备损伤处理组及益生菌干预损伤处理组的试验纳入到本项研究中。自1999年6月30日至2022年4月20日,筛选获得12篇相关体内研究文献纳入本次试验,所纳入总样本909例,用Review Manager 5.4对纳入研究进行相关数据分析。选择标准化均数差(SMD)作为效应指标。结果表明:相较于损伤模型组,饲喂添加益生菌的饲粮可以有效提高断奶仔猪平均日增重[SMD=1.35,95%置信区间(CI)=0.86~1.83,P<0.00001],影响平均日采食量(SMD=0.46,95%CI=-0.16~0.76,P<0.00001),降低料重比(SMD=-1.10,95%CI=-1.61~-0.59,P<0.00001)。这些结果表明,益生菌制剂可以改善损伤断奶仔猪的生长性能。展开更多
文摘The selection and comparison of different growth models for describing weight gain of piglets raised in organic farming is investigated by using the Akaike’s Information Criterion (AIC). In total, 49,699 data points of 5188 piglets recorded between 2007 and 2013 were considered. From the day of birth, up to 40 days (i.e. until weaning) the model of von Bertalanffy was favored by the AIC. This model is with 60.32% more likely to truly reflect reality than any other of the analyzed models. Up to 105 days, the two-linear model was favored by the AIC (probability 99.75%). The intersection point of the two-linear model was calculated by 53.8 days, which fitted well to the actual change in the food situations.
