Aug 2 (Reuters) - Warren Buffett's Berkshire Hathaway ( BRK/A )

on Saturday wrote down part of its investment in Kraft

Heinz ( KHC ), and reported a 4% decline in second-quarter

operating profit as premiums from insurance underwriting fell.

Berkshire also reported a 59% decline in net income,

reflecting lower overall investment gains from its common stock

holdings, as well as the Kraft Heinz ( KHC ) writedown.

Operating income totaled $11.16 billion, or about $7,760 per

Class A share, compared with $11.6 billion a year earlier. Net

income fell to $12.37 billion from $30.35 billion.