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
为探究肠道损伤对断奶仔猪生长性能、血清和空肠炎症因子带来的影响,本试验对相关方面的研究进行了Meta分析。通过计算机对PubMed、Science Direct和Web of Science数据库进行检索,检索肠道损伤对断奶仔猪生长性能、血清和空肠炎症因子...为探究肠道损伤对断奶仔猪生长性能、血清和空肠炎症因子带来的影响,本试验对相关方面的研究进行了Meta分析。通过计算机对PubMed、Science Direct和Web of Science数据库进行检索,检索肠道损伤对断奶仔猪生长性能、血清和空肠炎症因子影响的随机对照试验。检索年限从2000年1月至2023年4月,设定样本纳入及排除标准进行文献筛选、数据提取,纳入总样本34篇,用Review Manager 5.4对纳入文献进行相关分析,效应指标选择标准化均数差(SMD)。结果显示:肠道损伤能够显著降低断奶仔猪平均日增重[SMD=-1.43,95%置信区间(CI)=(-1.71,-1.15),P<0.0001],降低平均日采食量[SMD=-1.08,95%CI=(-1.47,-0.69),P<0.0001],提高料重比[SMD=1.06,95%CI=(0.50,1.62),P=0.0002];肠道损伤显著提高空肠中白细胞介素-1β(IL-1β)[SMD=1.36,95%CI=(0.52,2.20),P=0.001]、肿瘤坏死因子-α(TNF-α)[SMD=0.76,95%CI=(0.22,1.30),P=0.006]、白细胞介素-6(IL-6)[SMD=0.79,95%CI=(0.26,1.32),P=0.004]以及血清中TNF-α[SMD=2.69,95%CI=(1.56,3.81),P<0.0001]的含量。这些结果表明,肠道损伤影响断奶仔猪的生长性能,损害免疫功能。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.
