Abstract: A retention device which can be removably retained in a body cavity has branch members which are movably connected to each other such that two relative configurations may be obtained. In one configuration the branch members are nested inside one another for inserting the retention device in a cavity. Once in a cavity an operating member is used to displace the branch members to form the second configuration, in which parts of the branch members are expanded to bear against the walls of the cavity and retain the device.

Abstract: The device for insertion into a body cavity e.g. the rumen of an animal for example a cattle beast is in the form of a resilient helical coil with bio-degradable portions. The device is deformable to have a smaller dimension to enable insertion through a body passage into the animal cavity. The device carries a drug e.g. progesterone and is retained in the body cavity for a time during which the drug is active. After time has passed the device is broken up by bio-degrading activity into pieces small enough to be discharged naturally by the animal. An applicator is provided.

Abstract: A package in the form of a tray, carton or case has at least a base, side walls and end walls, a support formed by two panels positioned within the package, one adjacent each of end walls, or side walls, protrusions, and/or recesses on each panel of a size so that with the packages positioned in a stack, vertically adjacent protrusions and/or recesses are in contact without substantial compression of the packaging material positioned between vertically adjacent panels, and positioned apertures in the package to receive protrusions. The package in a preferred form also includes lugs provided at each corner of one face, the lugs being angled and the package also having corresponding cut-outs so that in a vertical stack the lugs of one package are positioned in the cut-outs of a vertically adjacent package.