Authors : M. Mazhari , M. Danesh Mesgaran and A. Heravi Moussavi
Abstract: In situ degradable parameters and ruminal and post ruminal disappearances of Dry Matter (DM) and Crude Protein (CP) of a variety of Iranian rapeseed meal (SLM sp.) were determined. Then, 14 early lactating Holstein cows for 8 weeks were fed diets containing 10.95% Soybean Meal (SBM) or 10.85% Rapeseed Meal (RSM) in a completely randomized design with repeat measurement analysis. Dry matter intake and milk yield were measured daily and milk composition were measured weekly. Blood metabolites including glucose and non amino-N were measured in weeks 1, 4, 6 and 8. Feces pH was monitored at weeks 4 and 8. Degradable coefficients of RSM including rapidly, slowly and Fractional degradation rate, were 0.32, 0.49 and 0.092 for DM and 0.33, 0.58 and 0.12 for CP, respectively. Ruminal and post ruminal disappearance of DM and CP were 0.68, 0.52 and 0.71 and 0.66, respectively. Dry matter intake (kg/cow/day) was significantly (p<0.05) influenced by the diets (RSM = 19.9, SBM = 20.5, SEM = 0.21). Milk protein and milk solid non-fat of cows fed RSM (28.88 and 86.03, respectively) were significantly higher (p<0.05) compared with animals fed SBM (27.63 and 81.8, respectively). Milk fat, lactose and urea nitrogen, fecal pH and BCS were all similar between diets (p>0.05). Data of the present experiment indicated that the Iranian variety of RSM might be used in high producing lactating Holstein cows without any adverse effect.
M. Mazhari , M. Danesh Mesgaran and A. Heravi Moussavi , 2009. Effect of Diet Containing a Variety of Iranian Rapeseed Meal (SLM sp.) on High Producing Lactating Holstein Cow Responses. Journal of Animal and Veterinary Advances, 8: 265-269.