title: Studies on the duration of pregnancy in relation to size of lamb at birth in indigenous and cross-bred sheep.
mesh_terms: D000818:Animals; D000831:Animals, Newborn / Q000033:anatomy & histology*; D001724:Birth Weight; D001947:Breeding; D005260:Female; D005838:Genotype; D006824:Hybridization, Genetic; D008297:Male; D011247:Pregnancy; D011270:Pregnancy, Animal; D012756:Sheep / Q000235:genetics*