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Webster 1913 Edition

Noun.

The calling sound made by cows and other bovine animals.

ppr.

Bellowing, as an ox.

Noun.

the bellowing or cry of cattle.

lowing

present participle of low

The cattle are lowing, the baby awakes.

But little Lord Jesus, no crying he makes. - Away In a Manger

lowing ‎(plural lowings)

The sound of something that lows.
- 1918, William Henry Hudson, Far Away and Long Ago
  […] the herd of four or five hundred cattle trotting homewards with loud lowings and bellowings […]