Why in-winter?
D000383:Agriculture; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D000831:Animals, Newborn; D003365:Costs and Cost Analysis; D004777:Environment; D005260:Female; D011225:Pre-Eclampsia / Q000662:veterinary; D011247:Pregnancy; D012621:Seasons; D012756:Sheep; D012757:Sheep Diseases / Q000517:prevention & control