There is a concept that my maternal grandmother had that they would always having their own husbandry (cows/buffalos) within her village and yes, they didn't eat eggs as well.

My maternal grandfather was a teacher which was a really prestigious job at that time, the only reason that they had their own cows was because of the belief. Reflecting upon it now, I believe it to be a good faith belief, they took care of the animals as well in terms of personal care from what I've heard of stories growing up, my mother still remembers some of the cows/buffalos and their names and other things so that's nice to hear as well :)