author(s)
S Shekhar, Sanjay Kumar and Ravindra Kumar

abstract
A 30 days pre-trial and 90 days trial was conducted to study the effect of different dose of synbiotics (Synbiotics used in study was Chromyeast^® Intas-pharmaceutical Ltd., Ahmadabad, per gram of Chromyeast^® contains Saccharomyces cerevisiae-5 billion CFU, Lactobacillus acidophilus- 200 million CFU and fructo-oligosaccharide -100 mg) on quantity, quality of milk and economic analysis of feeding in cross breed lactating cow. In pre-trial period all 30 selected cows were fed only basal diet and recoded milk yield, fat, protein, SNF, lactose, density and freezing point were recorded on 0,15 and 30 day. In trial 30 cross breed lactating cows were divided in three groups FP (Farmers practice group), T1 and T2 on the basis lactation stage, lactation number and average milk yield of all three groups were more or less similar. The Farmers practice group (FP) kept as control- only basal diet were given, Group (T1) basal diet and synbiotics @ 10 gram/cow/day and Groups (T2) basal diet and synbiotics @ 20 gram/cow/day. On 30, 60 and 90 day of trial milk yield, fat, protein, SNF, density were increased significantly (P<0.05), lactose and freezing point were decrease significantly (P<0.05) in T1 and T2 as compared to control group (FP). The B:C (benefit cost ration) ratio of FP, T1 and T2 groups was calculated 1.66, 1.78 and 1.86 respectively. Supplementation of synbiotics @ 20 gm/ cow/ day was found more beneficial than synbiotics @ 10 gm /cow/day.