اثر فرم فيزيكي خوراك بر برخي پارامترهاي رشد و متابوليت هاي خوني گوساله هاي شيري

The effect of physical form of diet on some growth parameters and blood metabolites of dairy calves

In order to investigate the effect of physical form of diet on performance and some blood metabolites, eighteen female* Brown Swiss calves weighing 39.5±1.2 kg after birth were randomly assigned to three treatments including: mash starter (M.S), pelleted starter (P.S), and pelleted and rolled starter (PRS). Diets were formulated to be isonitrogenous. Weight gain of calves has significant difference in treatments (P<0.05).Weight gain in MS was lower (45.16 kg) than PS (53.25 kg) and PMS (54.08 kg). Total intake of starter without time spot in MS (68.14 kg) was lower than PS (80.03 kg) and PMS (85.69 kg). Feed efficiency had no significant difference in treatments. Crude protein and organic matter digestibility in MS were lower than other treatments (P<0.05). Treatments had no significant effects on blood glucose content, but concentration of blood urea nitrogen (BUN) in MS was higher than other treatments (P<0.05). In conclusion, starter in form of pellet and mixture of pellet and rolled can improve weight gain in dairy calves.