Table 4 Productive performance of litters from young and mature sows during lactation¹

Pigs per litter, n

 Total born

14.52

14.62

17.56

16.33

0.95

0.581

0.014

0.509

 Born alive

14.00

13.86

15.88

14.56

0.90

0.434

0.158

0.538

 After cross-fostering

14.33

14.05

15.00

15.00

0.89

0.869

0.365

0.869

 Still born

0.31^z

0.65^yz

1.14^y

0.81^yz

0.26

0.504

0.011

0.071

 Mummified

0.19

0.05

0.47

0.13

0.11

0.052

0.177

0.965

 At d 10 of lactation

12.43

12.96

12.76

12.81

0.83

0.818

0.815

0.862

 At weaning

12.24

12.85

12.24

12.44

0.83

0.625

0.805

0.808

Litter weight, kg

 Live at birth

19.11

19.63

21.52

19.93

0.90

0.506

0.095

0.199

 After cross-fostering

19.72

20.01

20.33

20.70

0.76

0.570

0.262

0.950

 At d 10 of lactation

44.14

44.85

42.91

43.51

1.83

0.586

0.285

0.965

 At weaning

69.49

70.14

67.90

67.24

3.08

0.998

0.254

0.739

 Litter average daily gain, kg

2.48

2.50

2.48

2.33

0.13

0.425

0.306

0.310

 Creep feed disappearance³, g/d

72.35^ab

100.98^a

102.43^a

69.04^b

35.46

0.823

0.931

0.007

Individual pig weight, kg

 Live at birth

1.37

1.44

1.42

1.41

0.05

0.608

0.797

0.428

 At d 10 of lactation

3.49

3.47

3.51

3.41

0.08

0.454

0.881

0.622

 At weaning

5.60

5.49

5.76

5.45

0.13

0.092

0.612

0.421

 Pig average daily gain, kg

0.21

0.20

0.22

0.20

0.01

0.037

0.649

0.539

Pig mortality⁴, %

 Died prior to weaning

14.74^yz

9.10^z

18.37^y

19.24^y

3.30

0.162

0.002

0.088

 Crushed by sow

7.35

5.63

8.01

10.90

2.12

0.905

0.080

0.176

 Low vitality/starved

6.11

3.00

8.96

6.21

2.17

0.034

0.030

0.513

 Rupture

0.33

0.34

0.78

0.83

0.47

0.963

0.312

0.981