Pulling an animal of breeding rotation is always a personal call based on experience and how you feel about the animal, there is no set weight or set weight loss that dictate whether or not the animal should be pulled.
Losing a 100 grams for an animal that size is really not much, but if you don't feel comfortable in breeding him you can pull him out just know that because you will pull him out does not mean he will resume feeding for you.
I had a male that was a small male to start with top weight 800/900 grams at the very most, he would stop eating soon as he would start getting paired and he would generally loose about 150/200 grams each breeding season. I have never pulled him out simply because I know my animals and knew it was typical for him does not mean I would not have pulled another male doing the same thing out of rotation.
This is one of those things you learn on your own there is no recipe, it's about monitoring your animal make sure they animal is healthy, well hydrated and trusting your own judgment.
When I pull an animal out it is because it does not feel right to me to breed them it's not about specific written guideline.
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