the wool covering of a sheep. Flock – a group of sheep (or goats). All the sheep on a property (in Australian Wool Classing); also all the sheep in a region or country. Sometimes called herd or mob. Flushing – providing especially nutritious feed in the few weeks before mating to improve fertility, or in the period before birth to increase lamb birth-weight. Flushing (eggs/embryo) – removing unfertilised or fertilised egg from an animal; often as part of an embryo transfer procedure. Fly strike or myiasis – infestation of the wool, skin and eventually flesh with blowfly or botfly maggots, rapidly causing injury or death. Usually (but not always) occurs where the wool has become contaminated by dung or urine, or at the site of an injury. Also see crutching, dagging, Mulesing. Fold (or sheepfold) – a pen in which a flock is kept overnight to keep the sheep safe from predators, or to allow the collection of dung for manure. Folding – confining sheep (or other livestock) onto a restricted area for feeding, such as a temporarily fenced part of a root crop field, especially when done repeatedly onto a sequence of areas. Foot rot – infectious pododermatitis, a painful hoof disease commonly found in sheep (also goats and cattle), especially when pastured on damp ground. G-K Gimmer (, not ) – a young female sheep, usually before her first lamb (especially used in the north of England and Scotland). Also theave. Graziers' alert or graziers' warning – a cold-weather warning issued by the weather bureau to sheep graziers. Greasy – a sheep shearer. Greasy wool – wool as it has been shorn from the sheep and therefore not yet washed or cleaned. Also see lanolin. Guard llama – a llama (usually a castrated male) kept with sheep as a guard. The llama will defend the flock from predators such as foxes and dogs. Gummer – a sheep so old that it has lost all of its teeth. Hefting (or heafing) – the instinct in some breeds of keeping to a certain heft (a small local area) throughout their lives. Allows different farmers in an extensive landscape such as moorland to graze different areas without the need for fences, each ewe remaining on her particular area. Lambs usually learn their heft from their mothers. Also known as 'Hoofing' in some areas like North Yorkshire. Hogget, hogg or hog –