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ŠUMARSKI LIST 9-10/2021 str. 24     <-- 24 -->        PDF

subsequent to certain age. As Jumić (2003) established a 10‐year culmination of the red‐deer trophy value for this Hunting ground, the differences between the cohorts in case of an interaction manifestation should be observed in an age range of one to 10 years. Therefore, it is mostly about a phenomenon that the cohorts, notwithstanding a variable, display no difference at an early age, but it becomes significant later. The most frequent differences are manifested at a transition from the juvenile to the mid‐aged deer (aged 3 to 5 years). When it comes to the weight of dry antlers, however, the 1996 cohort has a significantly higher weight of dry antlers than the 1986 cohort as soon as after the yearling age (table 2; g[1]: F= 0,49; p=0,49; i[2]: F=10,9; p<0,01).
In 27 cases, upon a calculation of Potthoff’s modification of the Johnson–Neyman method (Kim 2010), it was impossible to calculate an age at which a significant difference between certain cohorts sets on due to the case of square root of a negative number’s. In tables 2 to 10, these cases are demarcated as “srnn”, and occurred: in 6 cases for main beam length (table 3), in 5 cases for circumference of coronets (table 6) and trophy value (table 10), in 4 cases for the number of tines (table 9), in 2 cases for the weight of dry antlers (table 2), lower (table 7) and upper beam circumference (table 8). In only one case upon a calculation of Potthoff’s modification of the Johnson–Neyman method square root of a negative number occurred for the length of brow (table 4) and tray tines (table 5). Consequently, one may say that, in such cases, there is no significant difference between the cohorts in the one‐to‐10‐year age span observed irrespective of significant “p” values.
In three cases, the differences are significant as early as at a later age, exceeding a 10‐year economic maturity. They are recorded for the factors of lower beam circumference (table 7; 1989<1990; age>11 years; g: F= 5,41; p<0,05; i: F=23,77; p<0,00001), number of tines (table 9; 1992<1997; age>15 years; g: F= 5,88; p<0,05; i: F=9,41; p<0,001) and trophy value (table 10; 1989<1990; (age>13 years; g: F= 5,30; p<0,05; i: F=29,83; p<0,00001). Thus, these differences may be considered insignificant.
It is interesting that, in eight cases, the significant differences are manifested up to a juvenile‐head age group, and they disappear subsequently. Such differences are recorded in several variables: main beam length (table 3; the cohorts of 1988 and 1991; age<6 years; g: F= 4,97; p<0,01; i: F=4,75; p<0,05; the cohorts of 1988 and 1992; age<5 years; g: F= 9,67; p<0,05; i: F=27,95; p<0,00001), length of brow tines (table 4; the cohorts of 1986 and 1992; g: F= 8,09; p<0,01; i: F=21,49; p<0,00001), circumference of coronets (table 6; the cohorts of 1986 and 1989; age<8 years; g: F= 9,45; p<0,01; i: F=24,31; p<0,00001 and the cohorts of 1988 and 1989; age<5 years; g: F= 10,90; p<0,01; i: F=31,03; p<0,00001), lower beam circumference (table 7; the cohorts of 1988 and 1989; age<5 years; g: F= 8,18; p<0,01; i: F=23,78; p<0,00001 and the cohorts of 1993 and 1997; age<3 years; g: F= 7,68; p<0,01; i: F=12,85; p<0,0001) and upper beam circumference (table 8; the