Table 1 Least square means and standard errors (SE) of body weight (BW) at 41 d of age (kg), and the total number (JOY#) and total duration (JOYt) of joyful brusque movements in eight min in three consecutive runway tests at 41, 44 and 48 d of age, by sex and by litter

7.38 (0.23)

6.79 (0.25)†

7.7 (1.3)

12.0 (1.4)*

11.9^a (1.6)

5.9^b (1.6)

11.5^a (1.6)

10.5^ab (1.8)

5.6 (1.4)

8.9 (1.5)

7.9^a (1.9)

8.5^a (1.9)

7.0^a (1.8)

6.1^a (2.1)

7.7 (0.9)

9.7 (1.0)

11.0^a (1.2)

10.0^a (1.2)

11.2^a (1.2)

2.2^b (1.3)

18.7 (5.1)

32.6 (5.5)†

54.0^a (5.7)

8.7^b (5.7)

24.3^c (5.3)

14.9^bc (6.0)

8.4 (2.5)

14.1 (2.6)

16.5^a (3.4)

11.7^a (3.4)

9.8^a (3.2)

8.3^a (3.6)

13.0 (1.9)

17.2 (2.0)

20.1^a (2.7)

18.7^a (2.7)

18.3^a (2.6)

2.9^b (2.9)