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For suckling steers and heifers, Synovex® C can help add pounds before weaning.

For increased rate of weight gain in suckling beef calves more than 45 days of age and up to 400 pounds of body weight. Also for improvement in rate of weight gain in steers weighing greater than 400 pounds and fed in confinement for slaughter when used as part of a re-implant program in which an initial Synovex® C implant is followed at approximately 70 days by Synovex® S.

https://www.zoetisus.com/products/beef/synovex-implant-finder/synovex-c/