The paper studied 35 Holstein cows on a dairy farm in Volgograd region in 2023. The cows received a balanced diet with corn silage. hay. concentrated forages. https://www.roneverhart.com/10-oz-Black-Thermal-Plastic-Molcajete-Bowl-5-1-4-x-5-1-4-x-2-1-2-1-count-box/