http://revach.net/article.php?id=2677

Section:  Avodah   Category: Perek Shira
Perek Shira: The Cows Also Miss The Bais HaMikdash
The Shira of the large kosher animals is “Harninu Leilokim Uzeinu Hari’u Leilokei Yaakov”, sing aloud to Hashem our strength; blast joyful sounds to Hashem of Yaakov.   This pasuk is from Tehilim 81, and it is the Perek we say on Yom Chamishi as the Shir Shel Yom.

The Vilna Gaon writes in the name of the Zohar that the world will exist for 6000 years corresponding to the days of the week.  The Shira we say each day of the week corresponds to those thousand years.  That means that the Shir of Yom Chamishi corresponds to the Jewish year 4000-5000 (roughly from the years 240-1240 CE).

The Shiras Meir points out that these one thousand years were after the Churban Bais HaMikdash and there were no Korbanos.  The gemara Taanis 27b says that Hashem promised Avrohom that when there will be no Bais HaMikdash, Hashem will accept our Tefilos in place of Korbanos.

Similarly say the Shiras Meir, the kosher animals are also missing out.  During the time of the Bais HaMikdash they were brought up LiRatzon on the Mizbei’ach.  In the 1000 years corresponding to Yom Chamishi there was no mizbei’ach.  Therefore they sing to Hashem in lieu of being brought for a Korban.

May we be zocheh to Bi’as HaMoshiach and the Binyan Bais HaMikdash where both Am Yisroel and the kosher animals will once again participate in the Avodas HaKorban to Hashem.