Utilization and reproductive performance of gilts in large-scale pig farming system with different production levels in China: a descriptive study

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

	High-performing pig farms (n =26)	Low-performing pig farms-Total pigs (n =26)	Low-performing pig farms-Breeding pigs (n = 22)	Low-performing pig farms-Commercial pigs (n = 18)
	Mean ± SEM	Mean ± SEM	Mean ± SEM	Mean ± SEM
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

ISSN: 2055-5660