A Genetic Analysis of Aggressive Behavior
Table 1
Percentage of Animals of Five Inbred Strains Showing Aggressive Behavior in Four Types of Tests (1)
Page 13
Test & Behavior WAG
(W)
Lewis
(L)
Fischer
(F)
Irish
(I)
DA
(D)
Statistical comparisons (2)
Competitive Fighting
Bite & Kick Attack
Offensive Sideways
0
0
0
0
0
0
30
80
10
40

I>>L; I>>F; I>>W; D>L; D>F; D>W
Shock-Induced Fighting (3)
Boxing - male

Boxing - female

Boxing - both sexes
20

0

10
40

0

20
20

0

10
100

80

90
100

60

80
I>W; D>W;
I>F; D>F
I>F; I>W; D>W

I>>F; I>>W; I>>L; D>>F; D>>W; D>L
Restraint Resistance (4)
     Animals not isolated
Vocalization
Struggling

Biting
30
30

0
30
40

0
71
86

43
50
50

0
0
0

0
F>>D; I>D
F>>D; I>D;
L>D; F>W


Test & Behavior WAG
(W)
Lewis
(L)
Fischer
(F)
Irish
(I)
DA
(D)
Statistical comparisons (2)
Restraint Resistance (4)
     Animals isolated
Vocalization

Struggling
Biting
40

50
10
30

50
10
88

88
75
100

100
78
50

50
0
I>>L; I>>W
I>D; F>L
I>W; I>L; I>D
I>>D; I>>L; I>>W; F>>D; F>>L; F>>W
Isolation-induced Fighting (5)
Bite & Kick Attack

Offensive Sideways
0

10
70

60
86

86
30

40
40

60
F>>W; L>>W
F>I; D>F
F>>W; L>W; D>W

(1) High levels of aggression indicated by bold italics.

(2) Comparisons by Fisher's Exact test for 2 x 2 Contingency Table. p < .05 indicated by >; p < .01 indicated by >>.

(3)Males showed significantly more boxing than females (p = .03 by sign test).

(4) Differences between isolated and unisolated males significant by Chi Square test (X²=8.3; p < .01 for biting; X²=5.2 and 6.1; p < .05 for struggling and vocalization respectively.

(5) Data from home rats only. Intruders did not attack.


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