Effects of different rumen undegradable to rumen degradable protein ratios on performance, ruminal fermentation, urinary purine derivatives, and carcass characteristics of growing lambs fed a high wheat straw-based diet

Adel Valizadeh, M. Kazemi‐Bonchenari, Mahdi Khodaei‐Motlagh, Mohammad Hossein Moradi, Abdelfattah Z. M. Salem