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So far , Dr. Blackwell says that the producers he is working with have not been able to develop a cost-effective alternative to farrowing crates used to house pregnant sows from a few days prior to delivery to the time piglets are weaned . In other words , the determination is made on a case-by-case basis and takes into consideration the unique and varied nature of the responsibilities of team leaders and applies the above criteria to the facts of each case . Growth does not appear to begin until the yolk membrane is weakened by age or physically breached and the yolk nutrients become available to the organisms . Research indicates that the organisms are physically located on the exterior of the yolk membrane - in contact with the bacteriostatic albumen . Interestingly , Brocard found the points now named for him in the course of studying the problem of three dogs chasing one another . On the surface of a sphere , the shortest distance is along a segment of a great circle passing through the points . The simulations clearly suggest that , under the right circumstances , an individual driving erratically enough can readily cause the sorts of traffic jams normally associated with much heavier traffic . The three video presentations showed what appeared to be contented pigs , and in all , the producers said that they had no reason to return to an individual crating system . The organisms include a slime mold ( Physarum polycephalum ) , choanoflagellate ( Monosiga ovata ) , placozoan ( Trichoplax adhaerens ) , cnidarian ( Hydra magnipapillata ) , snail ( Biomphalaria glabrata ) , and two roundworms ( Pristionchus pacificu and Trichinella spiralis ) . In addition , veterinarians and their educated staff members are encouraged to inform their clients of the responsibilities of cat ownership and ways to prevent or solve behavior problems .