BR 892:7(1) :לישנהון דברייתה היא חמורתה גמלותה‏ : it is just popular speech: herd of donkeys, herd of camels [explaining שׁוֹר וַחֲמוֹר Gen 32:6 where a singular functions as a collective] †
See the entire entry for gmwlh n.f. herd of camels

BR 892:7(1) :לישנהון דברייתה היא חמורתה גמלותה‏ : it is just popular speech: herd of donkeys, herd of camels [explaining שׁוֹר וַחֲמוֹר Gen 32:6 where a singular functions as a collective] † 
See the entire entry for ḥmwrh n.f. herd of donkeys