1. Guide for the Care and Use of Agricultural Animals in Research and Teaching;ADSA-ASAS-PSA,2020
2. Effects of cobalt supplementation and vitamin B12 injections on lactation performance and metabolism of Holstein dairy cows;Akins;J. Dairy Sci.,2013
3. Effects of cobalt supplementation on carbohydrate and nitrogen utilization by ruminal bacteria in continuous culture;Allen,1986
4. Official Methods of Analysis;AOAC International,2019
5. Method of determining and expressing fineness of feed materials by sieving. Standard No. S319.4;ASAE (American Society of Agricultural and Biological Engineers),2008