July 28 (Reuters) - Donegal Group Inc DGICA.O :
* Announces significantly improved second quarter and first half 2015 results
* Q2 operating earnings per share $0.23
* Q2 earnings per share $0.24
* Says book value per share of $15.62 at June 30, 2015, compared to $15.40 at
year-end 2014
* Says net premiums written increased 9.3% for the second quarter of 2015
* Says net investment income of $5.2 million for the second quarter of 2015
increased 11.8%
* Source text for Eikon ID:nGNXVEBVDa
* Further company coverage DGICA.O ((Bengaluru Newsroom; +1 646 223 8780))