Butter is not necessary to make bread in an electric oven, and some kinds of bread don't need butter, such as French bread, which is very simple and requires only high gluten flour, water, salt and yeast. Some of them can be replaced with other fats and oils, the oil used for frying vegetables at home, is one of the types that can be used for substitution.

The fats and oils used to make bread are generally butter (pure butter), no refined lard can be used, colorless and tasteless vegetable oil (refined vegetable oil), salad oil and other alternatives, the effect is slightly different, but you can not use sheep's oil, lard, sesame oil, peanut oil and other fats and oils with a strong smell and color, and it is best to avoid the use of cream of wheat and other synthetic phylloxera butter.

Expanded information:

Butter, also known as cream, white skimmed oil, is a combination of thin milk and skim milk. Skimmed milk separation, so that the thin cream ripened and stirred into. The biggest difference between butter and cream is the composition, butter has a higher fat content. High-quality butter is light yellow in color, uniform and delicate in texture, with no moisture seeping out of the cut surface and a fragrant smell.

References:

Butter - Baidu Encyclopedia