Increased age at first-mating interacting with herd size or herd productivity decreases longevity and lifetime reproductive efficiency of sows in breeding herds

Table 3 Comparisons of performance measurements (Means and SEM) between two herd size and two productivity groups¹

	Productivity groups
Herd size groups	Ordinary herds	High productivity herds
n
Small-to-mid farms	37,743	14,522
Large farms	41,851	41,749
Herd-life annualized piglets weaned, pigs
Small-to-mid farms	23.5 ± 0.2 ^b,y	27.1 ± 0.3 ^a
Large farms	24.5 ± 0.3 ^b,x	26.9 ± 0.3 ^a
Herd-life nonproductive days
Small-to-mid farms	95.0 ± 2.3 ^a,x	66.9 ± 4.7 ^b
Large farms	77.1 ± 4.6 ^y	67.2 ± 5.1

¹Means and SEs were estimated by the models
^a,b Different superscripts within a row represent significant differences in means (P < 0.05)
^x,y Different superscripts within a column represent significant differences in means (P < 0.05)

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