To estimate the energy and protein requirements for maintenance of dry Holstein cows, 3 series of experiments on nitrogen and energy balance were conducted. The results obtained were as follow. 1. Nitrogen excreted into urine on 4-5th day of fasting...
To estimate the energy and protein requirements for maintenance of dry Holstein cows, 3 series of experiments on nitrogen and energy balance were conducted. The results obtained were as follow. 1. Nitrogen excreted into urine on 4-5th day of fasting was 405.7㎎/W^0.75, and DCP requirement was 2.5g /W^0.75/day. 2. Net energy, metabolizable energy, digestible energy and TDN requirements for maintenance were 88.3, 116.4, 150.4Kcal and 38.4g per metabolice body size, respectively.