@article{
  author = {Rafieei, H.},
  title = {Responses of Milk Urea Nitrogen Content to Dietary Rume Degradable Protein Level in Lactating Holstein Dairy Cows},
  journal = {Iranian Journal of Applied Animal Science},
  year = {2011},
  volume = {1},
  number = {2},
  pages = {111-116},
  doi = {}
}