High-performing farms exploit reproductive potential of high and low prolific sows better than low-performing farms

Table 2 By-parity relative frequencies (%) of farm groups in three sow groups categorized by piglets born alive in parity 1^a

		Sow groups^b			Chi-square test
		High prolific	Intermediate prolific	Low prolific
Farm groups^c	N^d	sows, %	sows, %	sows, %
		Parity 1
High-performing farms	35,274	18.8	71.7	9.5
Intermediate-performing farms	37,263	10.1	77.6	12.3
Low-performing farms	12,559	6.2	76.2	17.6	< 0.01
		Parity 6
High-performing farms	11,411	20.9	72.6	6.5
Intermediate-performing farms	12,917	10.2	79.9	9.9
Low-performing farms	4372	5.9	78.7	15.4	< 0.01

^aFrequencies within a row add up to 100%
^bGroups based on the upper and lower 10th percentiles of piglets born alive in parity 1: High (15 piglets or more); Intermediate (8 to 14 piglets) and Low (7 piglets or fewer) prolific sows
^cCategorized by farm means of the upper and lower 25th percentiles of annualized lifetime piglets weaned per sow over 6 years: High- (> 24.7 pigs); Intermediate- (24.7 to 21.2 piglets) and Low- (< 21.2 piglets) performing farms
^dN means the number of sows

ISSN: 2055-5660