Section 522.2690 - Zinc gluconate(a)Specifications. Each milliliter of solution contains 13.1 milligrams zinc as zinc gluconate neutralized to pH 7.0 with L-arginine.(b)Sponsor. See No. 011788 in § 510.600(c) of this chapter.(c)Conditions of use in dogs -(1)Amount. The volume injected into each testicle is based on testicular width as determined by measuring each testicle at its widest point using a metric scale (millimeter) caliper.(2)Indications for use. Intratesticular injection for chemical sterilization of 3- to 10-month-old male dogs.(3)Limitations. Federal law restricts this drug to use by or on the order of a licensed veterinarian. 68 FR 26995 , May 19, 2003, as amended at 76 FR 79064 , Dec. 21, 2011; 87 FR 76422 , Dec. 14, 2022