Effects Of Rumen-Protected Betaine On The Performance And Somatic Cellcount Of Lactation Cows

The experimental investigated the effects of different levels of betaine on milk production in subclinical mastitis and milk production and blood components in late-lactation dairy cows. The aim estimated the possibility to betaine being used in dairy cow.Experiment one:Fifteen dairy cows were selected according to similar age, parity, lactation during, milk yield and somatic cell. Somatic cell count exceeded to one million/ml.15cows were divided into experimental treatmentⅠ,ⅡandⅢ. Each treatment has five cows. Experimental groupⅠ,ⅡandⅢwere respectively added to 12g,18g,24g rumen protected Betaine, with pre-feeding 3 days and 35 days of being fed. The results showed that the milk yield of experimental cows had tendency to increase with a increasing amount of betaine additive, respectively -2.23kg,-0.32kg andl.66kg, but the difference was not significant (P>0.05).The milk contents of all three experimental group cows had a increase in milk fat rate and milk protein rate. TreatmentⅠwas significantly different (P<0.05), and others were not significant (P> 0.05). The lactose content of all three treatment cows was lower. Treatment I was significantly different (P<0.05), and other differences were not significant (P>0.05). Total solids, non-fat solids content of treatmentⅠandⅢwere decreased. The content of treatmentⅡincreased, but the difference was not significant (P>0.05). Experiment showed that supplementing 24g rumen protected betaine hand a good for milk yield and milk composition.Experiment two:Forty dairy cows were selected according to similar age, parity, number of lactations and milk yield.40cows were divided into control, treatmentⅠ,ⅡandⅢ. Each treatment has ten cows. Dairy cows were fed a common TMR. Dairy cows of control were fed TMR that was not included rumen protected betaine. TreatmentⅠ,ⅡandⅢwere respectively added to 5g/d,7.5g/d and 10g/d rumen protected Betaine, with pre-feeding 7 days and 42 days (6 weeks) of being fed. The results showed that only the milk yield of the treatmentⅡincreased 1.14kg/d, with other differences not significant (P>0.05). The milk fat content of three treatment has not significant difference than that of control (P>0.05). The milk protein rate of treatmentⅠwas higher. TreatmentⅡandⅢwere slightly lower than that of control. But it is not significant (P>0.05). The somatic cell count of treatmentⅠandⅢwas very significant lower than that of control (P<0.01), andtreatmentⅡwas significantly lower than that of control (P<0.05). The milk urea nitrogen and milk ketone content in all three treatments were lower than that of control, it is not significant different (P>0.05). The results indicated that betaine could decrease somatic cell count and the milk urea nitrogen content, and have a positive effect of prevention and treatment on mastitis dairy cows.Experiment three:Forty dairy cows were selected according to similar age, parity, lactation during and milk yield.40cows were divided into control, treatmentⅠ,ⅡandⅢ. Each group has ten cows. Dairy cows were fed a common TMR. Dairy cows of control were fed TMR that was not included rumen protected betaine. TreatmentⅠ,ⅡandⅢwere respectively added to 5g/d,7.5g/d and 10g/d rumen protected Betaine, with pre-feeding 7 days and 42 days (6 weeks) of being fed. Blood samples were collected in the middle day of experiment and the last day of experiment. T-AOC, MDA, NO, NOS, SOD, blood ketone and urea nitrogen were determined. The results showed that Betaine have an effect on antioxidant for dairy cattle, while reducing nitrogen loss. The best amount of additives is 5 g/d.