Stock valued at thousands of dollars have been stolen from Shepparton Regional Saleyards.
Twenty-nine sheep were stolen from the yards last Thursday night, just before the regular Friday sheep sale.
Balmattum farmer John Gall lost 10 fat lambs after he had left them in the pens about 5.30pm on Thursday.
‘‘We thought they might have been moved to another pen, at first,’’ Mr Gall said.
He was disgusted at the thought that someone had taken advantage of the farmers who had dropped their stock off at the yards.
The thefts were discovered when stock agents arrived on Friday about 7am.
Saleyards manager Ian McDermott said they would be beefing up security at the yards.
He said it was unusual to have such a theft, and the selection of stock from the pens indicated it was someone who knew about the quality of stock they were after.
Most of the animals taken were fat lambs, which would have had a combined value of about $3700.
Mr McDermott said the police were investigating and he was in possession of some information which would be helpful in tracking down the offenders.