Effects of live yeast supplementation on serum oxidative stress biomarkers and lactation performance in dairy cows during summer

• Published in: Journal of Veterinary Medical Science Vol. 81; no. 12; pp. 1705 - 1712
• Main Authors: MIRZAD, Ahmad Nawid, GOTO, Akira, ENDO, Takuto, ANO, Hitoshi, KOBAYASHI, Ikuo, YAMAUCHI, Takenori, KATAMOTO, Hiromu
• Format: Journal Article
• Language: English
• Published: Japan JAPANESE SOCIETY OF VETERINARY SCIENCE 2019; Japan Science and Technology Agency; The Japanese Society of Veterinary Science
• Subjects: Animal lactation; Antioxidants; Biomarkers; Carbohydrate metabolism; Carbohydrates; Cholesterol; cow; Dairy cattle; Internal Medicine; Lactation; Lipid metabolism; live yeast; Metabolism; Metabolites; milk; Oxidative stress; Physiological responses; Protein turnover; Respiration; Respiratory rate; Serum levels; Standard error; Summer; summer season; Supplements; Vitamin A; Yeasts; milk; live yeast; cow; summer season; oxidative stress
• ISSN: 0916-7250; 1347-7439
• DOI: 10.1292/jvms.19-0328

This study aimed to evaluate the effects of live yeast (Saccharomyces cerevisiae) (LY) supplementation on serum oxidative stress biomarkers, antioxidant vitamin levels, and lactation performance in dairy cows during summer. A total of 16 lactating cows weighing 707.5 ± 13.1 kg (mean ± standard error) were enrolled and randomly assigned to either supplemented (n=8) or control group (n=8). In the supplemented group, the cows were administered with LY product at 10 g/day per cow from mid-July to mid-September for 8 weeks. The serum levels of derivatives of reactive oxygen metabolites in the supplemented group were lower (P<0.05) at week 6. The serum retinol and blood glucose concentrations in the supplemented group were higher (P<0.01) at week 8. LY supplementation did not affect physiological responses, such as rectal temperature, respiratory rate, protein and cholesterol metabolism, and lactation performance. During the study period, daily average milk yield decreased in both groups. The reduction rates of milk yield in the supplemented and control groups were 17.6 and 20.0%, respectively. These results suggest that LY supplementation may reduce oxidative stress and improve carbohydrate metabolism in lactating dairy cows during summer.