Table 2 Parameters of fitted weight curves and 95% confidence intervals

BW_max, maximum body weight (kg)

13.10

(0.13) a

[12.81; 13.39]

12.03

(0.11) b

[11.75; 12.30]

16.16

(0.16) c

[15.79; 16.54]

α, mature:birth body weight ratio

2.55

(0.16) a

[2.18; 2.92]

2.50

(0.14) a

[2.15; 2.85]

2.60

(0.18) a

[2.19; 3.01]

k, maturation rate

0.088

(0.005) a

[0.077; 0.099]

0.078

(0.004) b

[0.069; 0.087]

0.075

(0.005) b

[0.065; 0.085]

t_PI (weeks)

10.64

(0.22) a

[10.15; 10.81]

11.73

(0.26) b

[11.06; 12.03]

12.73

(0.27) b

[12.12; 12.90]

BW_PI (kg)

4.82

(0.11) a

[4.71; 4.93]

4.42

(0.10) b

[4.32; 4.52]

5.95

(0.14) c

[5.08; 6.08]

Maximum of weight velocity

0.42

(0.06) a

[0.36; 0.49]

0.35

(0.048) b

[0.30; 0.39]

0.45

(0.07) a

[0.38; 0.52]