Unless you are doing a lot of cutting in and around spinal and brain tissue, a good wash will be enough. boiling water for a minute is about 40 seconds of overkill, but whatever makes you comfortable. The thing you want to be getting rid of (prions) with game meat doesn't get broken down by heat, so you want to clean it off, flush it away. So long as you are not right near a water source, a good liquid dishsoap without antibacterial is safe. The antibacterial will do nothing for you, but will kill the bacteria in the soil, which is not ideal. I think the US is one of the only places where triclosan is still in use, but it may be phased out by now. You are better off focusing on making sure your hands are clean afterward and watch for the animal's condition, know what illnesses they may be carrying which can impact humans, a lot of folks hunt in areas with anthrax, plague, and TB without knowing it. It's all about prioritizing risk. Sanitizing your knife afterward does nothing if you handle a bunch of infected lung tissue, or something more serious.