What do we learn from "Alufeinu Mesubalim"?
Brachos 17a #1: Our leaders in Torah are laden with Mitzvos.
Brachos 17a #2: Our leaders in Torah and Mitzvos are laden with suffering.
Rashi: The great people among us are Nisbalim on the small (they accept them and heed them). Due to this, "Ein Peretz."
Radak #1: "Alufeinu" are our cattle, like "Shegar Alafecha" (Devarim 28:4), "k'Keves Aluf" (Yirmeyah 11:19). They are strong and full, and they can bear the load of their labor - plowing and pulling wagons.
Radak #2: Our cattle bear much meat (they are fat).
Malbim: The cattle that are used to plowing, they are burdened with work in the field, for we have much work.
Why does it say "Ein Peretz v'Ein Yotzeis v'Ein Tzevachah"?
Brachos 17a: Our company should not be like that of David, Shaul or Elisha, from which came out, respectively, Achitofel, Do'eg and Gechazi.
Rashi: No bad repute goes out, and there is no voice of tumult of war.
Radak: There is no bereavement among us and our animals. Bereavement is called Peretz - "Asher Raratz Hashem Peretz b'Uzah" (Shmuel II, 6:8). No person or animal is Yotzei to captivity. There is no screaming that Yisrael was stricken in war. As long as David was king, Yisrael were not stricken in front of their enemies.
Malbim: Because 'Baneinu ki'Nti'im' (13), "Ein Peretz", for they guard the way of Mishpat. Because "Benoseinu ch'Zaviyos", Ein Yotzeis for Zenus and evil ways; they are all modest. Because "Mezaveinu Mele'im", Ein Tzevachah - people do not scream for food.
Yalkut Ma'am Lo'ez,, Ohr Torah citing the Vilna Gaon: On Ta'aniyos for rain, we bring the Aron into the street and cry out in prayer (Ta'anis 2:1). When "Alufeinu Mesubalim", this is not needed.
Why does it say "bi'Rechovoseinu"?
Brachos 17a: We should not have a son or Talmid that will publicly go off the proper path.
