I suspect that the comment you are replying to had a crop rotation system in mind where the manure from the animals directly fertilises the fields, see, for ins

I suspect that the comment you are replying to had a crop rotation system in mind where the manure from the animals directly fertilises the fields, see, for instance, Norfolk Crop Rotation: https://www.britannica.com/topic/Norfolk-four-course-system https://www.britannica.com/topic/Norfolk-four-course-system.