On the day of Khaiber, Allah's Messenger (ﷺ) forbade the eating of garlic and the meat of donkeys.

On the day of Khaibar, Allah's Messenger (ﷺ) forbade the Mut'a (i.e. temporary marriage) and the eating of donkey-meat.

On the day of Khaibar, Allah's Messenger (ﷺ) forbade the eating of donkey meat.

Allah's Messenger (ﷺ) forbade the eating of donkey-meat.

On the day of Khaibar, Allah's Messenger (ﷺ) forbade the eating of donkey meat and allowed the eating of horse meat.

We where afflicted with severe hunger on the day of Khaibar. While the cooking pots were boiling and some of the food was well-cooked, the announcer of the Prophet (ﷺ) came to say, Do not eat anything the donkey-meat and upset the cooking pots. We then thought that the Prophet (ﷺ) had prohibited such food because the Khumus had not been taken out of it. Some others said, He prohibited the meat of donkeys from the point of view of principle, because donkeys used to eat dirty things.

During the Ghazwa of Khaibar, the Prophet (ﷺ) ordered us to throw away the meat of the donkeys whether it was still raw or cooked. He did not allow us to eat it later on.

I do not know whether the Prophet (ﷺ) forbade the eating of donkey-meat (temporarily) because they were the beasts of burden for the people, and he disliked that their means of transportation should be lost, or he forbade it on the day of Khaibar permanently.