Effect of supplementing Saccharomyces cerevisiae to milk on the growth performance, white blood cell profile, skeletal indices, and rectal temperature in neonatal Simmental calves

AABSTRACT- In the present study, ۳۰ newborn calves with an average weight of ۴۲.۵۵ ± ۰.۹۸ kg were used in a completely randomized design with ۵ treatments and ۶ replicates over a period of ۴۲ days. The yeasts were mixed with milk and fed to the calves in the morning. The experimental diets were as follows: ۱- control diet (without yeast), ۲- ۲.۵ grams of live yeast, ۳- ۵ grams of live yeast, ۴- ۲.۵ grams of inactive yeast, and ۵- diet containing ۵ grams of inactive Saccharomyces cerevisiae per calf per day. The calves were fed milk twice daily, in the morning and evening. Every ۲۱ days, the calves were weighed, skeletal indices and rectal temperature were measured. Blood samples were collected at the end of the period. Milk composition was measured. The results showed that ۲.۵ gr of non-living yeast had the highest daily weight gain and also had the lowest feed conversion ratio (P < ۰.۰۵). Except eosinophil other components of white blood cells were not affected,. Yeast- supplementation had no significant effect on the rectal temperature and skeletal growth indices (P<۰.۰۵) . Adding live and non-living yeast Saccharomyces cerevisiae to milk, increased the dry matter, density and conductivity of milk. Finally, it was concluded that adding live and non-live yeast Saccharomyces servicii to milk improved performance of suckling calves.

کلیدواژه ها:

Saccharomyces cerevisiae ، Immune responses ، skeletal indice ، Rectal temperature ، suckling calf