Abstract: A fibrous plug to be inserted in a sucking tube for use for collecting and preserving sperma, fertilized ovum or the like in artificial fertilization or transplantation for human and animals, composed of a gelatinizing material component present in a gas-permeable dispersed form and a supporting fiber component, wherein the gelatinizing material component is distributed finely among the supporting fiber component, so as to permit swelling of the gelatinizing material upon contact with a water-containing substance, such as sperma or the like, to build up an intrgrated water-tight sealing stopper together with the supporting fiber component.

Abstract: A system for identifying livestock and other individuals comprising an identification plate for identifying the animal and a gate-shaped antenna, which is characterized in that the identification plate is a marker plate, which in turn is made of a soft material and comprises a flexible printed board formed with an antenna coil, a tuning condenser and an electronic circuit; said gate-shaped antenna comprises plural unit antennas which are wound with a coil each and which are crossed at an angle so that electromagnetic fields can be generated over a wide range of area without interfering with each other at the time of radio wave transmission/reception for retrieving data on said identification plate.