Nitrogen balance (NB) experiments allow calculation of N retention in the body by subtracting excreted feces (NF), urine (NU) and milk (NM) from intake (NI). In a previous study, we found that NB data with lactating dairy cows were generally high and, current meta-analysis, update our earlier study last 2 decades investigate probable causes error. A total 83 publications, 86 307 dietary treatme...
