“…Ultrasound technology had been used as a non‐invasive approach to investigate the reproductive organ structures of living animals such as the Indonesian thin‐tailed sheeps (Ulum, Paramitha, Muttaqin, Utami, & Utami, 2013), domestic cats (Ulum et al., 2017), dogs (Davidson & Baker, 2009a) and the bottlenose dolphins (Brook, 2001). Ultrasound technology has been extensively used for monitoring ovarian activity in wild animal ungulates (Sontakke, 2017), wild cats (Malandain et al., 2011; Pelican, Wildt, Pukazhenthi, & Howard, 2006), ostriches (Pandian, Selvan, Rajini, Parthiban, & Karthickeyan, 2016); livestock such as camels (Kelanemer et al., 2015), buffalo (Gad, Mohamed, El‐Azab, Sosa, & Essawy, 2017), cattles (Scully et al., 2015), sheep/goats (Khan et al., 2016) and pigs (Da Silva, Laurenssen, Knol, Kemp, & Soede, 2017); pet animals such as dogs and cats (Davidson & Baker, 2009b); and animal models such as rabbits (El‐Gayar et al., 2014) and mice (Benevenuto et al., 2017).…”