Yesterday I was told by a local breeder I needed to start feeding wheat germ, they told me it would help keep my rabbits fertile through the summer months. My question is is this true will it help or will it just cost me extra out of pocket with not helping much at all?
Wheat germ is like using BOSS or ACV. It provides extra nutrients. That might help in some cases but nothing is going to prevent a buck going sterile in the heat if they don't have the genetics to handle it and it's not going to keep you from losing any sensitive does you've bred in the heat. That's all genetics. Supplements like that just aim at keeping them healthier and filling in any missing nutrients. Wheat germ is probably too expensive to feed an entire herd though unless you know of a bulk animal grade source. It comes in fairly small jars in the grocery store. BOSS and ACV are cheaper. A few people also had luck with raspberry tea getting does in the mood.
Wheat germ is cheaper at a bulk food store than in the supermarket and you can get it raw instead of toasted. Raw is more nutritious. It is rich in Vitamin E which along with Vitamin A are necessary for willingness and ability to breed. Both these vitamins are easily lost from pelleted foods due to poor or prolonged storage. But, as Akane said, none of these supplements are going to help prevent heat sterility in bucks.