Table 1. Table 1. Sources of stress and recent review papers written on the topic.

Sources of stress	Review paper
Infectious disease of the reproductive tract	Bromfield et al., 2015; Eckel and Ametaj, 2016; Sheldon et al., 2018; Gilbert, 2019.
Injury	Funnell and Hilton, 2016; Jewell et al., 2019; Kammel et al., 2019.
Heat	Gwazdauskas, 1985; Hansen, 2007, 2009; Collier et al., 2017; Polsky and von Keyserlingk, 2017; Roth, 2017, 2018a.
Metabolic imbalance postpartum	Lucy et al., 2014; Baumgard et al., 2017; Overton et al., 2017; Lucy, 2019.
Social/psychological	Dobson and Smith, 2000; Karsch et al., 2002; Breen and Karsch, 2006; Ralph et al., 2016; von Keyserlingk and Weary, 2017.
Nutritional	Butler, 1998; Wilde, 2006; D’Occhio et al., 2019.
Transportation	Hong et al., 2019.