Talmud su Giobbe 39:31

Rab Ḥiyya bar Ashi was sitting before Rav who saw him disturbed. He said to him, what is the matter? He said to him, my female donkey is pregnant and will give birth; then I have to get her to copulate before she is out of heat. He said to him, when did the male mount her? He said, on day X. He calculated and said, she still has some time until then. It was stated so: A quick female donkey does not need less than the days of the moon¹⁵⁰354 days in a lunar year. and one who is late is not later than the days of the sun¹⁵¹365 days in a solar year. The Babli, Bekhorot 8a, simply states that impure domestic animals have a gestation period of 12 months.. The words of Rebbi Joshua ben Levi disagree, since Rebbi Joshua ben Levi said, the cattle herd of the government¹⁵²In Niddah 1:4: “of Antoninus”; cf. Kilaim, Chapter 9, Note 79. was there for copulating and those of the house of Rebbi took bulls from them to copulate. Some of them gave birth soon and some of them later¹⁵³It seems, later than the 11 days‘ difference allowed by Rav.. Here it is about a pure animal, there about an impure animal. But is it not written, “do you know the time the mountain goats will give birth, etc.” “Count months, make them complete, you will know the time of their giving birth.¹⁵⁴Job 39:1–2.” “Do you know the time of giving birth?” A pure wild animal is like a domestic impure animal¹⁵⁵This supports the prior assertion of Rav and excludes only domestic pure animals from predicting the exact time of gestation. The Babli, Baba batra 16a/b, uses Job 39:1 to prove that the time of birth of wild animals is unpredictable. Elsewhere, Bekhorot 8a, the gestation period of great predators (lions, wolves, bears, panthers) as well as apes and marmosets is given as three years..