Komentaryo sa Genesis 31:38: Rashi, Chizkuni, Rashbam & Sforno

לא שכלו means HAVE NOT MISCARRIED — Similar are: (Hosea 9:14) ‘‘a miscarrying (משכיל) womb”; (Job 21:10) “his cow calveth and casteth (תשכל) not her calf”.

לא שכלו, “did not miscarry;” it is customary for shepherds to occasionally beat one or another of the animals entrusted to him in order to force them to walk in line with the other beasts. This could result in a miscarriage of a pregnant animal. Yaakov prides himself never to have beaten any of these animals, and that is how he explains that in twenty years under his care none ever miscarried.

לא שכלו, neither because of any lack of adequate grazing nor due to careless supervision

ואילי צאנך AND THE RAMS OF THY FLOCK — From this phrase they (the Rabbis) inferred (Bava Kamma 65b) that a male sheep even when one day old is called a ram; for if this be not so, how was this creditable to him? Did he mean that he had not eaten rams (i. e. the larger animals), but that he had eaten the smaller sheep? If so, he was a thief! (39).