Answer

Yes, generally dudhi / bottle gourd can be eaten on Gyan Panchami (Nyan Pachem), if it is prepared in a Jain way.

Explanation

On Gyan Panchami, many Jains observe special devotion toward Jnan / knowledge, scriptures, and learning. Food practices may vary by family, sampraday, and personal vow.

Generally, dudhi is acceptable because:

• It is not a root vegetable.
• It is commonly used in Jain cooking.
• It can be prepared without onion, garlic, potato, or other abhakshya items.

However, if you are observing a specific tapasya, ayambil, upvas, ekasana, or a family/customary niyam for Gyan Panchami, then you should follow that niyam.

Takeaway

For regular Jain food, dudhi is usually allowed on Nyan Pachem. But if you have taken a special vow or follow a temple/family rule, follow that specific rule.