تاثير مكمل پروپيلن گليكول و نمك هاي كلسيمي اسيد چرب بلند زنجير بر پارامترهاي خوني، توليد و تركيب شير گاوهاي شيري

Effects of Propylene Glycol and Ca-LCFA on Blood Parameters and Dairy Cows Production

Current experiment was conducted to investigate the effect of propylene glycol supplement (PG) and calcium salt long chain fatty acids (Ca-LCFA) on milk production and blood metabolites of dairy cows. A change over design with 2x2 factorial arrangement including 2 levels of PG (0 and 450 gram/day) and 2 levels of Ca-LCFA (0 and 2.5%) were applied. Treats were recorded on 8 Holstein dairy cows in 4 different periods. The results showed that there was no significant interaction between PG and Ca-LCFA on recorded treats. The concentration of blood glucose increased significantly after using PG in the diet (P<0.05). The blood betahydroxy butirate (BHBA) content decreased significantly after using PG in the diet. Using PG had no significant effect on blood concentration of triglyceride, urea nitrogen (BUN) and cholesterol. In addition PG supplement had no effect on dry matter intake, milk yield, protein, lactose and fat percentage of milk, milk dry matter content and milk solid not fat (SNF). Using Ca-LCFA had no significant effect on blood concentration of BUN, glucose, triglyceride and BHBA, but the blood cholesterol content were significantly increased when Ca-LCFA was used. Ca-LCFA has also no effect on milk yield, protein, lactose and fat percentage of milk, milk dry matter content and milk solid not fat (SNF). In addition Ca-LCFA reduced dry matter intake.