The objective was to investigate the growth of Tamworth- or Berkshire-sired pigs from Berkshire sows at the North Carolina Agricultural and Technical State University Farm. The location features a humid subtropical climate with subtropical summer temperatures and mild winters and an average annual precipitation of approximately 110 cm. Forty-four purebred Berkshire females were used to produce crossbred and purebred Berkshire pigs. Females were given altrenogest (Matrix) for estrus synchronization for 14 consecutive days at 7 ml for gilts and 9 ml for sows. Thirty-three females were detected in heat and artificially inseminated, which resulted in 10 farrowed sows. Each sow farrowed in a 15-m² paddock in June 2014. Total number born were 67 in Tamworth × Berkshire (TB) and 51 in Berkshire × Berkshire (BB), respectively. Number born alive were 53 in TB, and 35 in BB. Pigs were weaned at 4 weeks of age. Body weights from 43 weaned Tamworth × Berkshire (TB) crossbred pigs were recorded from 6 sows, and weights from 28 weaned Berkshire × Berkshire (BB) purebreds were recorded from 4 sows as a control group. Birth weights (BW) were recorded at 3 d of age, and then body weights were recorded every 4 weeks from their birthdate to 20 weeks of age; weaning weight (WW), 8 weeks of age (W8), 12 weeks of age (W12), 16 weeks of age (W16), and 20 weeks of age (W20). Data were analyzed with repeated measures ANOVA using SAS PROC GLM. Least squares means of weights in TB were 1.90 ± 0.06kg (BW), 8.11 ± 0.29kg (WW), 19.11 ± 0.58kg (W8), 34.80 ± 1.10kg (W12), 54.49 ± 1.51kg (W16), and 79.16 ± 1.96kg (W20), respectively. Least squares means of weights in BB were 1.80 ± 0.08kg (BW), 7.78 ± 0.36kg (WW), 16.99 ± 0.74kg (W8), 31.58 ± 1.39kg (W12), 52.04 ± 1.91kg (W16), and 79.78 ± 2.48kg (W20), respectively. Body weights were significantly greater for TB compared with BB only for W8 and W12 (P < 0.05). More research is needed regarding breed types used in alternative production systems.