This is sort of up in the air, like that excerpt says. There’s no research saying absolutely not to do it, but we simply don’t know the long-term effects.
“For the pet rabbit, there is really no good reason to neuter your rabbit before it is mature.”
Yes and no. Ideally, both rabbits would already be altered when brought into the house. This is why we advocate adoption of altered rescue rabbits. You can begin bonding the next day. And this is the major drawback when you purchase a baby bunny.
You can wait to neuter until 6-12 months, but you are prolonging the separation and bonding process, and this can potentially make it more difficult b/c their individual “turfs” will be more firmly established.
This makes me wonder if (in some cases) rescue rabbits might end up being healthier in the long-run, since many of them do not get surrendered to shelters until that 6-12 month age group. This means they are already grown when they are spay/neutered…
Food for thought…