TY - JOUR T1 - Effect of Diets Containing Different Ratio of Effective Rumen Degradable Protein to Fermentable Metabolizable Energy on Early Lactating Holstein Cow Responses AU - , F. Rezaii AU - , M. Danesh Mesgaran AU - , A.R. Heravi Moussavi AU - , M.H. Fathi Nasri JO - Journal of Animal and Veterinary Advances VL - 6 IS - 4 SP - 563 EP - 568 PY - 2007 DA - 2001/08/19 SN - 1680-5593 DO - javaa.2007.563.568 UR - https://makhillpublications.co/view-article.php?doi=javaa.2007.563.568 KW - Effective rumen degradable protein KW -fermentable metabolizable energy KW -milk KW -cow AB - The effect of different Effective Rumen Degradable Protein (ERDP) to Fermentable Metabolizable Energy (FME) on early lactating cow responses was investigated. Total tract digestibility of organic matter of various feedstuffs including barely grain, corn grain, wheat bran, cottonseed meal, soybean meal, sugar beet pulp, alfalfa hay, cotton seeds, corn silage and fish meal was determined using in situ technique. These data were used to predict FME of the feedstuffs. Two diets were provided with different ERDP/FME ratio (9.7 and 10.7 g MJ ¹). The diets fed to fourteen early lactating Holstein cows averaging 21±16 Days In Milk (DIM) and 32±9 Kg d ¹ milk yield for seven weeks, using a completely randomized design. Dry matter intake, milk yield and milk composition were measured weekly. Blood metabolites including glucose and urea nitrogen were measured in weeks 4 and 7. Rumen fluid NH₃-N was recorded in the 3^rd week of the experiment. Dry matter intake was significantly (p< 0.05) lower for cows fed diet with ERDP/FME = 9.7 g MJ ¹ than those fed ERDP/FME = 10.7 g MJ ¹ (21 vs. 21.6, respectively). Milk yield was significantly (p< 0.05) higher in cows fed ERDP/FME = 9.7 g MJ ¹ compared with those fed ERDP/FME = 10.7 g MJ ¹ (35.2 vs. 32.3, respectively). Milk composition, blood metabolites and rumen fluid NH₃-N were not significantly affected by the treatments (p>0.05). ER -