Effect of supplementing canola quality rapeseed mustard cake on the metabolic profile and quality of milk in crossbred cows

摘要

This study examined the comparative effect of incorporation of improved canola quality and high glucosinolates rapeseed mustard oil cake (RMC) in the supplement of crossbred cows on metabolic profile, thyroid hormones, milk yield and quality of milk. Lactating crossbred cows (18) were randomly divided into three groups of six each in a completely randomized design and allocated in three dietary supplements, viz. SBM, RMC and CM containing soybean meal (SBM), rapeseed mustard cake (RMC) and canola meal (CM), respectively as a major protein source for a period of 90 days. Daily intake of total dry matter and green fodder was comparable irrespective of dietary treatments. The supplement intake (kg/d) was significantly lower in the cows that were given RMC supplement compared to those given either SBM or CM supplement. Incorporation of CM in the supplement significantly increased daily and total milk yield (kg) as compared to RMC group. The milk thiocyanate level was significantly higher in RMC followed by CM and SBM groups. Blood-biochemical profile except significantly higher lactate dehydrogenase in RMC group remained comparable at different periods. Serum thiocyanate was significantly higher in RMC followed by CM and SBM. Serum T-3 and T-4 hormone levels were significantly lower in RMC fed group as compared to CM and SBM groups. It can be concluded that feeding of canola quality RMC (GSC5/6) may be used as complete replacement of soybean meal without any adverse effect on metabolic profile, thyroid hormones, milk quality and yield in crossbred cows.