Straw or other litter in the pen is not always effective in preventing this, because the piglets remove the litter out of the lying area during physical activity [ 9], and it is obvious that the immediate environment of the piglets plays a primary etiological role in the appearance and development of leg injuries in suckling piglets.
As all piglets were handled by the same staff, the results of this study obviously suggest that the immediate environment plays a primary etiological role in the appearance and development of abrasions and lameness in suckling piglets.
Considering the usefulness of the sense of hearing to such highly organized animals as human beings, it may seem surprising that this sense is so limited in its appearance and development among animals.
During the past decade, evidence has been presented from a number of laboratories, including ours, that in animal model systems, both viruses and chemical carcinogens can play a role in the appearance and development of arteriosclerotic plaques.
Heterozygous mutant mice are grossly normal in both appearance and development, but exhibit, apart from other phenotypes, a subtle abnormal gait pattern that is detectable at about 4 weeks of age.
We speculate that the progression from Ostreococcus to Volvox to Chlamydomonas shown in Figure 19 may signify the appearance and development of a capacity for proteolytic processing by See2-like VPEs during the period of green alga evolution associated with a new role for the vacuole in organelle protein turnover.
The onset of puberty is a milestone marked by the appearance and development of secondary sexual characteristics and changes in behavior, growth, and reproductive capabilities.
Despite the seed development phenotype of the knockout plants, the mature seeds were wild type-like in appearance and ability to germinate (Fig. 6a, d).
Spectacularly unspectacular in appearance and style.
