فهرست نشریات علمی دسترسی آزاد ایران

This study aimed to investigate the effect of different forms of selenium in the nutrition of Holstein suckling calves. This study was performed using 40 male and female Holstein calves with an average age of 1 to 8 days and an average weight of 39±6 kg with 4 treatments and 10 replications as a completely randomized block design. Experimental treatments include: 1) Selenium-free base diet (control), 2) Basic diet with 3 mg/kg nano-selenium micelles, 3) Basic diet with 3 mg/kg nano-selenium colloid, and 4) Basic diet with 3 mg/kg sodium selenite. During the experimental period, the starter diet was given to the calves freely as well as chopped dried hay from the age of 20 days. The results showed that using different forms of selenium could not significantly affect feed intake, daily weight gain, and feed conversion ratio during periods. Also, various forms supplementation of selenium did not significantly affect blood metabolites including glucose, cholesterol, triglycerides, urea, albumin, total protein, and beta-hydroxybutyrate in suckling calves. The blood concentrations of aspartate aminotransferase, alanine aminotransferase, and superoxide dismutase could not make a significant difference by adding different forms of selenium in the suckling calves diet, while blood concentrations of glutathione peroxidase and catalase were significantly increased by adding nano-selenium micelles and selenium mineral form, respectively (P <0.05). Different forms of selenium did not change the withers height, in contrast to the heart girth and body length. It is generally concluded that nano-selenium micelles can improve the immune status of suckling calves.