. The Canadian field-naturalist. Natural history. 156 The Canadian Field-Naturalist Vol. 116 UJ CD ID Z CO 3 CO z LU O 12345678 9 10111213141516171819 20 2122 23 24 25 26 27 28 NUMBER OF YEARS (-1-1970) â LN(NUMBER) -^ REGRESSION Figure 4. Natural logarithms of counts of bison in Wood Buffalo National Park as a whole beginning in 1971. The straight line is the Calculated Regression Line. For two or three years a mobile "abattoir" was used. It consisted of three buildings on sleds pulled by a tractor. Finally, permanent abattoirs were con- structed at Hay Camp and on the
. The Canadian field-naturalist. Natural history. 156 The Canadian Field-Naturalist Vol. 116 UJ CD ID Z CO 3 CO z LU O 12345678 9 10111213141516171819 20 2122 23 24 25 26 27 28 NUMBER OF YEARS (-1-1970) â LN(NUMBER) -^ REGRESSION Figure 4. Natural logarithms of counts of bison in Wood Buffalo National Park as a whole beginning in 1971. The straight line is the Calculated Regression Line. For two or three years a mobile "abattoir" was used. It consisted of three buildings on sleds pulled by a tractor. Finally, permanent abattoirs were con- structed at Hay Camp and on the Peace Delta close to Sweetgrass River. A Veterinarian was present at all slaughters once the abattoirs were in use. As an example of the findings. Figure 5 shows the prevalence of tuberculosis in 527 males and 981 females examined at Hay Camp in the years 1952-56 (Fuller 1962: 29). Age Class 0 means calf, Classes 1 to 4 are ages 1 year to 4 years, Class 5 is Young Adult, Class 6 is Prime Adult, and Class 7 is Old Age. Characteristics used to define each age class are set out in Fuller (1959). It is clear from Figure 5 that the prevalence of tuberculosis increased with age as it did at Wainwright. Almost three-quarters of adult and old males were positive. Overall, 38 per cent of males and 40 per cent of females showed evidence of tuberculosis. There can be no denying that tuberculo- sis had been introduced to Bison in WBNP. Brucellosis (Contagious Abortion): The origin of Brucellosis in the park is a mystery, but it is most likely to be the Wainwright animals. Brucellosis was first confirmed in the park in 1956, which was the year that I left Ft. Smith. Some symptoms character- istic of Brucellosis had been seen during slaughters, but laboratory confirmation was lacking because it had not been possible to keep samples from freezing in the camps and on their way to the lab. The preva- lence of Brucellosis at the Sweetgrass abattoir during its period of use (1957-1958 to 1973-19
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