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First, there are actually no exact sentence that says "cavies hasmore health complications than rabbits" ever. But fortunately I have my own brain to analyze that for me. Unless my analyzations aren't correct.
First the Vitamin C issues, this alone can almost say it cause vitamin c alone covers a wide topic.
>guinea pigs can't produce their own vitamin c, rabbits can. although not enough to live them out, rabbits still needs vit sfrom outside source but not as high-demanding as cavies
>vitamin c also covers joints and bones issues, cartilage on the bones' joints are 50% made of vitamin c and rabbits has strong bonesto hop up because as I say they produce their own as well as get it from outside source, while in guinea pigs they totally depend it on outside source.
Vitamin C is of coursenot the only issue here, there are other health complications to look at, from abscess to toxemia. Both animals almost had had an equal possible diseases and problems but Guinea Pigs are more likely to get them faster than rabbits can.
>Let's say the LUNGS for example, Rabbits can standout humidity change in a fast rate, Guinea Pigs can't. Temperature change can kill both cavies and rabbitsifits on a fast rate but guineapigs are more delicate. Humidity change can cause some lung problem to cavies so fast that you may not recognize it.
>Cavies has an approximately 53mm length of lungs and rabbit has more than three times of it, a dusty bedding can cause complications to both anima;l but again guinea pig will react to faster than the rabbit.
In delivery:
>Rabbits has more and has exceedingly stronger rear muscles to push the babies out and guinea pigs has a small and not-as-strong built as rabbits.
>In pregnancy the ratio of how big the CHILD-MOTHER size of rabbits and cavies can tell it all.
In Pellets
>Guinea Pigs has a higher demand of specialize pellets,mainly of vitamin c and other more.
I'll come back soon with more comparisons.