Culling for health

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ollitos

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I know what most people would say but I'm going to ask anyways because I do love hearing everyone's point of view.

I have a doe who is an amazing producer. She consistently gives me litters of 8-10, she nurses them wonderfully, they are the first litters to be super fat and plump (the last litter literally outgrew the nesting box because of their SIZE before they were even opening their eyes!!), her kits are always docile. We have two of her daughters and the are equally wonderful producers. Their kits aren't growing quite as fast as their mother's do but only because this last litter from their mother supersized really fast!! The daughters are producing litters of equal size, equal health, equal temperament.

These are all meat mutts. We never sell these as breeding stock. The growout at the same rate as my New Zealands and dress out with the same live-to-dressed weight ratios as the NZs.

The ONLY downside is the kits are very prone to nest box eye.

I treat the Silver Fox, the New Zealands and these mutts all the same but litters from these three girls always end up with at least one kit with nestbox eye if not more. Right now, the mother has three kits with it. I know that genetically, some rabbits are more prone to certain diseases, illnesses, malformations, etc than others. Because these litters are always, without fail, destined for the dinner plate, I haven't worried about it.

But now that we've reached capacity and we have no vacancies for new rabbits, I'm starting to look harder at the pros and cons of my current breeding stock. My gut is telling me to keep these does through the summer and fall and then reassess. Once we get past all these crazy winter freezes, I'm going to experiment. I'd like to try adding ACV to the mother's water from conception to weaning for one litter, then none for the next litter and see if that yields any differences in the kits. Then proactively treat the eyes of one litter and see if using pink eye drops for cattle (vetrimycin?? can't remember the name) will prevent nestbox eye. I'm also going to watch the daughters and see if their kits are less likely to have nest box eye.

My feeling is that, in the end, I'll be culling all three of these girls. In the mean time, I'd like to see what I can learn.
 
I would say that as long as the NBE is not being passed to any other rabbits/litters, then watching the daughters' litters for this development could be beneficial to a breeding program IF YOU WANT THE MEAT MUTT LINE. I do know that you have pedigreed lines, that are giving you acceptable/expected growout and meat/bone ratio. I suppose the question I would have to answer for myself is "what does this line of meat mutts contribute to my overall program/goals?"

I have 3 does right now that I will probably be retiring to the freezer as the Silver Foxes and English Angoras start producing "keepers" ... none of the 3 does have anything against them other than they are not pedigreed, so therefor are taking valuable cage space from my pedigreed breeding program.
 
thoughts to consider as you mull this over

the offspring that you kept from the doe....did they have nestbox eye?
have you tried running a course of antibiotic through them?

the doe that's given you three with nestbox eye I'd probably cull and not hold back. The does that gives you just one... I'd be inclined to give a larger than normal nestbox so the kits have room to spread out. I'd experiment with bedding if you can as well. Different bedding absorb urine better.
 
Your meat line sounds like it has some wonderful qualities, besides the nest box eye. I'd be hesitant to scrap them all together. Maybe cut down their numbers, select the best of the best and cull the does that are producing the most affected kits. Maybe breed your purebred lines into them, and select against the trait.

I would be really interested to see how your experiment with the ACV turns out... but I wouldn't want a line reliant on it to prevent issues. And if it worked, it may mask the problem and make it harder to breed away from.

Just my .02 cents :)
 
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