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Animal Sci Annu Austral Australia barrenness and abortion birth to weaning Border Leicester Breirem Bull carotene cent Cheviot Coll Corriedale Crossbred daily Dept diet difference effect ewe lambs ewes mated ewes with twin feeding fertility flocks foetuses genistein genital tract gestation goitre goitrogenic Guyer and Dyer high plane Karakul lactation lamb mortality lambing percentage lambing rates lambs born last 6 weeks late pregnancy Leicester x Cheviot loss low plane Massey Agric Merino ewes milk yield multiple births mutton N.R.C. allowances night blindness number of ewes nutrients oestrogenic plane of nutrition Private communication Proc protein red clover reproduction and lactation reproductive performance Rowett Research Institute Schafzucht Scottish Blackface Sheep farming Shier single lambs stillbirths studies subterranean clover Thomson and Thomson total digestible toxaemia twin lambs udder vitamin Wallace weeks before lambing weeks of pregnancy weight gain wool Zealand Zivotn Zootekh