Chullin Daf 58 צולין דַף 58

Ameimar said regarding the eggs of a bird which was a tereifah, שיחלא קמא אסירא – the first clutch of eggs is forbidden, because it was considered part of the hen at the time it became a tereifah. Any subsequent eggs are permitted, because it is a case that זה וזה גורם – this forbidden factor (the tereifah hen) and this permitted factor (the rooster) cause together, which is permitted. Rav Ashi challenged him from a Baraisa which teaches that the eggs which develop in a tereifah are forbidden, and the Gemara answers that the case is בדספנא מארעא – where [the hen] was heated by the earth, i.e., the rooster did not play a role in the egg production, so they are the product of a tereifah and forbidden. Tannaim argue if ולד טרפה – the offspring of a tereifah may be used as a korban, and Ameimar explains that their machlokes is בשנטרפה ולבסוף עיברה – where [the mother] became a tereifah and later conceived, and they argue if זה וזה גורם is permitted or forbidden (thus, they would even be forbidden in consumption, and not just invalid as korbanos). Ravina holds that a tereifah cannot bear young (or produce eggs), and so explains Ameimar’s ruling differently.

Rav Huna said: כל בריה שאין בו עצם – any creature which has no bones, such as an insect, אינו מתקיים י"ב חדש – cannot live for twelve months. Rav Pappa said that this teaching has practical implications for Shmuel’s ruling: קישות שהתליע באיביה אסורה – a cucumber which became wormy while attached to the ground is forbidden. Although insects which develop in fruit are normally permitted before they crawl on the ground (because they are not included in the phrase "השורץ על הארץ" – which creep on the ground), Shmuel rules that attached fruit are considered like the ground, and insects which develop in them are forbidden immediately. Based on Rav Huna’s teaching, we can infer that if dates in a container became wormy, they are permitted after twelve months. Since worms which developed in the dates while they were attached could not have survived so long, these worms must have developed after the dates were detached, and are permitted. Rav said there is no such thing as a day-old gnat, nor a year-old fly.

A Mishnah states that if an animal has five legs or three legs, it is considered a מום. Rav Huna says this only applies to an extra or deficient foreleg, but חסר ויתר ברגל – a deficiency or redundancy in a hindleg, it is a tereifah, and may not be eaten at all, because כל יתר כנטול דמי – anything extra is like something removed. Just as a missing hindleg would be a tereifah, an extra hindleg is also a tereifah. There was an animal with two סניא דיבי – ceca (the pouch at the beginning of the large intestine), and Ravina ruled it a tereifah, based on Rav Huna’s principle of יתר כנטול. However, if they are connected so that they pour into each other, it is kosher (because they are considered one large structure). Rav Oshaya ruled an extra tube between the second and third stomachs to be a tereifah, and Nassan bar Shila, the chief slaughterer of ציפורי, testified before Rebbe that an animal with two intestines leaving the fourth stomach is a tereifah (but a bird with two intestines is kosher, because this does occasionally happen).