The effect of adding dried rumen contents on the performance and blood parameters of Holstein dairy cows

To investigate the effect of adding dried rumen contents on performance, production, milk composition and blood parameters in Holstein dairy cows, twelve Holstein dairy cows with average daily milk production of 36.25±3Kg and 111±6 days in milk in a completely randomized design with two treatments and 6 replicates were used. Treatments included control (basal diet; no dried rumen contents) and experimental treatments (control diet with 60 grams of dried rumen contents per day).. The cows were kept in individual pens and fed a total mixed ration ad libtium. The results showed that the addition of dried rumen contents in the diet had no significant effect on feed consumption in Holstein dairy cows co+9[[3+pared to the control group. Milk production was significantly increased in cows fed rumen-dried contents compared to the control group (P <0.05). Also, supplementation of dried rumen contents significantly increased milk fat percentage (P <0.01). Supplementation of dried rumen contents in the diet resulted in a significant increase in blood glucose, calcium and phosphorus levels (P <0.05) and a significant decrease in blood urea nitrogen (P <0.05). Also, increasing the content of dried rumen in the diet led to a significant increase in high-density lipoprotein in cow's blood serum (P < 0.05). According to the results of this experiment, the use of 60 g of dried rumen content in dairy cows is likely to improve performance.