Mansfield have let in 12 goals in those five home losses and Dearden said: "I felt we deserved something from the game.
"If you score two goals it should be enough to win a football match if you defend right and are professional about it. But some of our defending today was poor.
- Boulding handed 18th goal of season
Their third goal was offside. It was sloppy from us but the referee says it hit our man and he was played on. Surely he is active then? Someone will have to explain the rules to me. As far as I am concerned he was off.
"We have shot ourselves in the foot again and it is hard to take when you have put so much in. We have got to stop the rot somewhere along the line.
"The new lads did okay when they came on. Some people will ask why I didn't start with them but they have not played any football recently and will get a good week's training in this week to get them ready for next weekend.
"Jefferson stuck his goal away - that's what he is there for. You could see he wasn't fit but he will give us a different dimension. He came on and gave them problems.
"Brentford have done very well and were magnificent today. Their away record is second to none. But they know they have been in a game today.
"All in all we didn't deserve to lose a decent game of football."
Bees boss Andy Scott said: "I think Mansfield are one of the better sides down there.
"They are capable of scoring goals, pass the ball well and are very organised.
"I think Billy will be disappointed not to get anything after that first half but I think they can get out of trouble without a shadow of a doubt."
Injured defender Martin McIntosh has been allowed to go home following the death of his brother-in-law last night and will keep in touch with Dearden about his return.
Fellow injury victim Alex John-Baptiste will have his back problem examined by another surgeon this week.
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