Table 6.

Production system as a putative risk factor for T. gondii seropositivity in livestock.

Factor	Species	Statistically significant	Not statistically significant
Intensive	Pigs	9 (p), 20 (p), 28, 37 (p), 51 (p), 75 (p), 82 (p)	94
	Sheep	15 (p), 35 (p), 61, 69 (p), 81, 88 (p), 90 (p)	18, 57
	Goats	35 (p), 61, 68 (p), 81	–
Semi-intensive	Sheep	2, 35 (p), 68, 69, 81	36
	Goats	30, 35, 81	–
Extensive/animal friendly/organic/transhumance	Pigs	22, 51, 105	94
	Cattle	59, 78	21, 97
	Sheep	35, 58, 68, 88	14, 56
	Goats	35 (p), 68, 88	–
Backyard	Pigs	67	–
	Goats	47	–
	Chicken	4, 89, 91	–

(p) = protective factor; coding of references: 2 = Alvarado-Esquivel et al. (2013a), 4 = Alvarado-Esquivel et al. (2012a), 9 = Assadi-Rad et al. (1995), 14 = Condoleo et al. (2016), 15 = Cosendey-KezenLeite et al. (2014), 18 = de Barros Correia et al. (2015), 20 = de Sousa et al. (2014), 21 = de Souza et al. (2016), 22 = Deksne and Kirjusina (2013), 28 = Esteves et al. (2014), 30 = Garcia et al. (2012), 35 = Gazzonis et al. (2015), 36 = Gebremedhin et al. (2013), 37 = Gebreyes et al. (2008), 47 = Iovu et al. (2012), 51 = Kijlstra et al. (2004), 56 = Liu et al. (2015), 57 = Lopes et al., 2013, Lopes et al., 2013, 58 = Lopes et al. (2010), 59 = Magalhaes et al. (2016), 61 = Mainar et al. (1996), 67 = Pastiu et al. (2013), 68 = Rego et al. (2016), 69 = Rizzo et al. (2017), 75 = Schulzig and Fehlhaber (2005), 78 = Sun et al. (2015), 81 = Tzanidakis et al. (2012), 82 = van der Giessen et al. (2007), 86 = Villari et al. (2009), 88 = Xu et al. (2015), 89 = Xu et al. (2012), 90 = Zhang et al. (2016), 91 = Zhu et al. (2008), 94 = Samico-Fernandes et al. (2017), 97 = Fajardo et al. (2013), 105 = Wallander et al. (2016).