It's no yoking matter. Egg producer Cal-Maine Foods  (CALM - Get Report) , just laid, well, an egg.

Its earnings and revenue weren't expected to be that great, but even so investors were disappointed with the fiscal fourth-quarter performance of the company.

It reported a quarterly loss of 41 cents a share, 8 cents wider than the expected 33 cent loss. The stock was falling 5.79% in premarket trading to $37.10. 

Sales in the quarter declined nearly 37% to $280.6 million.

The poor performance comes as the result of the oversupply of eggs.

"The unfavorable supply and demand balance and anticipated future egg supply growth trends have continued to affect market prices and our business," said CEO Dolph Baker in an earnings statement.

The selling price of eggs over the last quarter dropped by 37% from the same period a year ago. Or more simply, a dozen eggs now fetches $1.062 vs. $1.694 a year ago, according to the company accounts.

That decline in price more than offset a slight increase in unit sales. The company said it sold 255 million dozen eggs in the quarter, up 1.2% from 252 million in the same period a year ago.

The company said it will not pay a fourth-quarter dividend.

Constable owns none of the securities listed in this story.