If you are claiming that there is a significant difference between the number of cattle slaughtered as reactors and the figure given in the disclosure, you really do need to back that assertion with hard evidence. The data requested was "the number of animals slaughtered under bovine TB control measures" and I think you'll find you are pretty much alone in thinking that the TBIS database is an inaccurate source for this figure.
There is a significant 'lag' in the statistic on 'compensation' as that of 'slaughtered'. This is because of the way in which compensation in Wales is awarded. The compensation award can take many months to conclude, as in Wales it is tied to the cattle testing regime. If the animal has recently been tested, it attracts the full rate, however, a testing lag on 60days, 50% of compensation value, 90days from test. 25% of compensation value. It also depends on breed and pedigree of the destroyed animal. The FoI request you quote actually tells you the number of animals where the compensation process has been finalised for 2010 as at February 2011. It is approximately half the number that were actually slaughtered. It is why the FoI request was worded (by the good doctor-smallholder) to deliberately solicit the reduced figure.
I am not alone in identifying this discrepancy, Defra attach a cautionary note to the statistic pointing out this fact. There is a difference in the compensation regime in Wales where It is linked to compliance on movement controls and the testing regime.
The claim that not all cattle slaughtered as reactors attract compensation is also an extraordinary one - if any significant number of cattle were being slaughtered without any
compensation, they would have heard the farmers' howls of complaint in New York!
Nor is there any reason why that would influence the IAA more than the rest of Dyfed.
Not only does any cow slaughtered with bTB in Wales that has not undergone, or booked, a reactor test will attreact NO compensation. The farmer will actually recieve a prosecution under the cattle control order legislation. The queue for this is at Carmarthen magistrates court.