Table 4 Average age-related and litter production of 35,847 gilts

Number of gilts

11,833

24,014

10,952

13,062

Introduction age

201 ± 0.46^a

210 ± 0.25^b

208 ± 0.38^c

211 ± 0.34^d

Age at first estrus

242 ± 0.42^a

252 ± 0.28^b

249 ± 0.34^c

254 ± 0.42^d

Age at first mating

255 ± 0.38^a

253 ± 0.28^b

250 ± 0.35^c

255 ± 0.42^a

Total number of piglets born per litter

11.8 ± 0.02^a

9.7 ± 0.02^b

9.9 ± 0.03^c

9.6 ± 0.02^d

Number of piglets born alive per litter

11.0 ± 0.02^a

8.7 ± 0.02^b

8.9 ± 0.03^c

8.6 ± 0.03^d

Number of weaned piglets per litter

9.3 ± 0.04^a

7.1 ± 0.03^b

7.0 ± 0.03^c

7.3 ± 0.03^d