1. Binns W, Lynn JF, Shupe JL and Everett, GA: A congenital cylopian-type malformation in lambs induced by maternal ingestion of a range plant, Veratrum californicum. Am J Vet Res 24, 1164(1963).
2. Basson PA, Morgenthal JC, Bilbrough RB, Marais JL, Kruger SP and van der Merwe JL de B: ‘Grootlamsiekte’ a specific syndrome of prolonged gestation in sheep caused by a shrub,Salsola tuberculata ffenzl ex moq) schinz var. tomentyosa. CA Smith, ex gellen. Onderstepoort J Vet Res 36, 59–101 (1969).
3. Liggins GC, Kennedy PC and Holm LW: Failure of initiation of parturition after electrocoagulation of the pituitary of the fetal lamb. Am J Obstet Gynecol 98, 1080–1086 (1967).
4. Comline RS, Silver M and Silver IA: Effect of foetal hypophysectomy on catecholamine levels in the lamb adrenal during prolonged gestation. Nature 225, 739–740 (1970).
5. Bosc MJ: Conséquences sur la parturition, de l’hypophysectomie de la mère ou du foetus, chez la brebis traitée par la dexaméthasone. CR Acad Sci [D] (Paris) 274, 93–96 (1972).