title: The association between variation in the seasonal onset of oestrus and litter size in the ewe.
mesh_terms: D000367:Age Factors; D000818:Animals; D000831:Animals, Newborn; D001947:Breeding; D004971:Estrus; D005260:Female; D005298:Fertility; D005313:Fetal Death / Q000453:epidemiology / Q000662:veterinary; D008297:Male; D011247:Pregnancy; D012621:Seasons; D012756:Sheep / Q000502:physiology*; D012757:Sheep Diseases / Q000453:epidemiology; D013997:Time Factors; D014659:Vasectomy