John Yu, a research fellow at Academia Sinica's Institute of Zoology, recalls how students brought a criminal prosecution for cruelty to animals against an American university professor he knew for experimenting on hens 'eggs. Later the professor established that nine-day-old chick embryos do not have a fully developed nervous system, and have no sensation of pain.
中研院動物所研究員余玉林記得，他認識的一位美國大學教授，因為以雞蛋做實驗，遭到學生投訴虐待動物，後來他發現雞胚胎在第九天時神經尚未發育完成，沒有痛感，他也因此獲判無罪。