Lynn:
I checked the 1852 Griffiths Valuation head of household listing for Caherduggan parish and there were no Brosnans listed. There were two Rielly records.
http://www.failteromhat.com/griffiths/cork/caherduggan.htm
I checked Roots Ireland for 1826-1836 and there were four Daniel Bresnihan/Brusnihan records.Three of the four were in Kanturk RC church. I assume you don't know Daniel's parents names? I did locate an early 1911 civil death record for a Daniel Brosnan in the Mallow registration district. There was also a 1914 record for a Catherine Brosnan. Possibly this record was for Daniel's wife. Copies of these records can be obtained from the General Register Office for around 4 euros each. If you are interested let me know and I can forward instructions.
Roger McDonnell
First name(s) Daniel
Last name Brosnan
Birth year 1829
Age at death 82
Registered year 1911
Registered quarter/year Jan - Mar 1911
Registration district Mallow
Volume 5
Page 315
First name(s) Catherine
Last name Brosnan
Birth year 1836
Age at death 78
Registered year 1914
Registered quarter/year Apr - Jun 1914
Registration district Mallow
Volume 5
Page 303