Tafsiran Ulangan 28:4: Rashi, Ibn Ezra, Kli Yakar & Tur HaArokh

שגר אלפיך means the young of thy cattle which the animal casts out (שגר) of its womb.

the fruit of your belly i.e., your offspring (belly is a euphemism).

Blessed is the fruit of your womb, etc. And afterward, He said Blessed is your basket and your kneading bowl, but in the curses He changed the order, mentioning your basket and your kneading bowl before the fruit of your womb. This is because logic dictates that the Holy One, blessed be He, would always perform a hidden miracle rather than a revealed miracle. The blessing of the fruit of the womb and the fruit of the land are all hidden miracles, for even if they increase beyond what is usual, this is not outside the realm of nature. However, [the blessing of] your basket and your kneading bowl, which contain detached fruits that have already been placed in vessels — if these increase, it is a revealed miracle. Whether one places two and finds three, as it says The jar of flour shall not be depleted, etc. (1 Kings 17:14), or whether one eats a little and it is blessed in their intestines — all of these are revealed miracles. Therefore, in the blessings He is saying: Not only will He perform a hidden miracle for you, but He will even perform a revealed miracle for you. And in the curses, it is the opposite — [expressing] “not only this, but even that [worse thing].”

ועשתרות צאנך — Understand this as the Targum does: the flocks of thy herd. Our Rabbis asked, “Why are they (the flocks of sheep) called עשתרות? Because, replied they, they enrich (מעשירות) their owners (through the sale of their wool, etc.) and make them strong as עשתרות — which are strong rocks (Chullin 84b; cf. Rashi on Deuteronomy 7:13).