As late-summer grasses lose their nutrition, Barinaga Ranch is bolstering the diets of its sheep with alfalfa and tasty almond hulls. To monitor their health, Marcia Barinaga’s team weighs all 80 ewes once a month, sending each animal, single file, through a narrow chute and onto a scale. If they are too fat or too thin, feeding is adjusted. Most of this year’s lambs, weaned in June, have been harvested; the rest will go to…