Changes in hair growth (5)

Changes in hair growth (5)


RESULTS
Maximum vibrissa length

With all follicles there was close agreement between left and right side club
lengths as described by Ibrahim & Wright (1975). With the six month and older
group of rats, of the 109 paired observations, 104 were within a 2 mm margin (i.e.
4% of a hair measuring 50 mm). Of the remaining 5 pairs none displayed a
difference of more than 3 mm. Similar results were obtained with the 3-monthold
animals, in which the average club lengths were up to 4 mm shorter than
vibrissae from the same positions on older rats.
Excluding the top horizontal row (which was not used experimentally), for the
older rats the range of measurements within vertical rows of follicles fell within
discrete non-overlapping groups; i.e. passing from the most posterior row 'a'
anteriorly 'a': 49-5-59mm; 'b': 42-47-5 mm; 'c': 31-38mm; 'd': 19-25-5 mm;
'e': 10-16-5 mm.