Had a look at this:
The Adelaide observerAdelaide, S. Aust. : John Stephens, 1843-1904 Ref: The Observer 13 Jul 1907, p26, column 1
but it was a column about Pigeon Shooting and Homing Pigeons!
It is a weekly paper (58 pages on Saturday July 13, 1907) and has interesting snippets from all over southern South Australia. I would guess that the item would be there somewhere but not on that date, coz I looked at every page.

I could tell you who owned the hen that won the Rosewarnes egg-laying contest.

I did look at the week before and the week after but no luck. It would be great to see it digitised as there is so much inormation.
Judith