https://www.semanticscholar.org/paper/Parameters-for-natural-resistance-in-bovine-milk-Ploegaert-Tijhaar/6eb52f693e3d3d0345dae7301502980d13230a48/figure/3
https://www.semanticscholar.org/paper/The-bovine-teat-canal%3A-Its-role-in-pathogen-and-of-Smolenski/c85c749158d33d751e115cf920f6e56e635212be
23.泌乳牛之乳頭管狹窄(teat stenosis)最容易發生的部位為何? ..-阿摩線上測驗