So any time you add greens or forage, you're taking up space in the cecum for digesting the pellets that fuel growth. Greens and forage are great for moisture, fiber, and carbohydrates, but protein is what drives growth in kits. For optimal gains in your kits, stick to just pellets with alfalfa hay a couple times a week from 3wks-6wks of age. After 6wks, the cecum has matured and hay is no longer necessary. After you've adjusted the diet, you'll select for better structure. Type is not just about show table performance. Commercial body type(structure) is how you optimize how much meat the frame of the rabbit can carry, while maintaining function. Depth = height from peak of the spine to the bottom of the foot. Width= how wide from the outside of each foot. Ideally you want a rabbit that's got great depth that's equal to it's Width. By breeding for these and selecting for them, you put more space for muscle to attach on the frame. Those muscles increase in size and give you optimal cuts of meat. When selecting kits during evaluation. You look at their type, their size and weight, then their color, and make your determination.

@Nicole Holland I have noticed the same thing. I frequently include black oil sunflower seeds in my rabbit feed to combat any lack of it though. I switched to feeding Dr Pol farm rabbit and haven't had a vitamin issue since.