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The best way to determine germination and growth rate of your seeds is the back of the seed packet.

Did you plant directly in the ground or have you started your seeds indoor in seed trays?

Temperature and moisture are very important for seed germination.

Here is a link about growing Rutabaga.

https://www.gardeningknowhow.com/edible/vegetables/rutabaga/planting-rutabaga.htm

Planting a rutabaga top in this way will most likely not lead to a new rutabaga, but because rutabaga is a biennial (grows for 2 years before producing seed), it will probably produce flowers and seeds this year if you plant it in the garden. Plants rooted in water tend to be delicate, so transfer it to soil carefully to avoid damaging any delicate roots it's produced. You can also eat rutabaga greens.

This can happen when they remain in ground for too long. This should only take about 100 days to mature from planting.

If they are not that mature yet, then it could very well be a phosphorous and potassium deficiency.

This article will give you more information on the care of these: https://www.gardeningknowhow.com/edible/vegetables/rutabaga/planting-rutabaga.htm

You can! You will more than likely have to wait to plant them outdoors until summer next year, though.

This article will help you to care for the plants: https://www.gardeningknowhow.com/edible/vegetables/rutabaga/planting-rutabaga.htm

Cruciferous vegetables like cabbage, kale, broccoli, and Brussels sprouts can be problematic for sheep if fed in large amounts. These veggies ferment quickly in the rumen, causing excess gas that can lead to dangerous bloat. They also contain goitrogens, which interfere with thyroid function, and glucosinolates, which can be toxic in high doses, causing gastrointestinal upset, anemia, or reduced growth. Additionally, some cruciferous veggies have high oxalate levels that can bind calcium, leading to deficiencies or kidney problems over time. If you want to feed them, keep portions small, introduce gradually, and mix them with other forage. Always monitor your sheep for signs of bloat or discomfort. For safer treats, opt for grass hay, alfalfa, or root veggies like carrots and beets in moderation.