Application of vitamins B1 and B12 injection on milk yield and composition and some blood biochemical traits in Holstein dairy cows

Resumo

The current study was aimed to determine the effect of B₁ and B₁₂ vitamins injection on milk production, milk composition and some blood biochemical in Holstein dairy cows. For this reason, 20 Holstein dairy cows with average milk production 30±2 kg and initial weigh 620±30 kg that they were in 60 days after calving as randomized experimental plan for 50 days were used. The treatments were control diet, injection of 10 _Ml ofThiamine (vitamin B_1), 10 _{Ml vitamin} Cobalamin (vitamin B₁₂₎ and 10 _{Ml vitamin} B_1, 10 _{Ml vitamin} B₁₂ together on their neck muscle weekly. Milk production and its composition were measured after 5, 7, 9 and 15 weeks. Also, for determine some blood biochemical such as lactose, total protein, cholesterol and triglyceride content, blood samples were taken from tail vein of cows that they which under study. Data from this study showed that although milk production wasn’t influenced by treatments but also lactose and protein percentage were higher on B₁₂ treated cows in six^th week. There were no significant differences between treatment about fat, protein and lactose in 9, 15 weeks. As result relevant from this study B₁ and B₁₂ injection had significant effect on milk other composition such as total protein, cholesterol and triglyceride at six^th week. Data from this study showed that B₁ and B₁₂ vitamins injection had shown different values for triglyceride, cholesterol and total protein. In conclusion the study recommends adding B₁ and B₁₂ improved the physiological status such as lactation performance and could be useful on milk fat, milk protein and some blood biochemical in Holstein dairy cows.