%0 Conference Proceedings %T Ruminal peptide and ammonia nitrogen concentrations in steers fed diets with different concentrate to lucerne hay ratios %A Vakili, Seyed Alireza %A Danesh Mesgaran, Mohsen %A Valizadeh, Reza %A Heravi Moussavi, Alireza %A Nassiri, Mohammadreza %A Hosseinhhani, Ali %J British Society of Animal Science %D 2007