BB,
4 aspects to consider here
Is it legal?
Is it safe?
Is it healthy?
Is it cost effective?
Is it Legal2 bits here - 1. is he obtaining it legally?, and 2. can he supply you?
1. His source would come under EU 183/2005 the Feed Hygiene Regulations, under which the source becomes a feed business operator, who has to comply with the principles of HACCP. The source would also need to register as a feed busines operator with the local council.
2. Can he supply you ? The regs state "In accordance with the principles of proportionality and subsidiarity, Community rules should not apply to certain cases of private domestic production of feed and feeding of certain animals, nor to the direct supply of small quantities of primary production of feed at local level" However broken biscuits would not constitite "primary production" so he would need to register as a feed business operator, and comply with HACCP principles.
In both cases the supplier (source and local farmer) would need to be happy that they comply with the Animal By-products Regulations 2005, in particular with Part 3 which deals with catering waste and feeding of animals to animals.
Is it Safe?EU 183/2005 puts the responsibility for feed safety firmly onto the supplier, but as buyer you would want to be happy that the feed has not got contaminated in any way (how stored? and how transported?) that it is subject to rotation (hasn't gone moudly in the bottom of the bin), hasn't got in contact with chemicals, rat poison etc.
You would also want to know what was in it to ensure that nothing that could harm the pigs was in it
Finally you would want to consider disease control - ie picking up feed from his farm means you are likely to get whatever his herd has got - so bio-security is a serious consideration
Is it healthy?It is highly unlikely that this mix would be a balanced diet, and you will want to consider what stock you feed it to. Growing piglets need not just crude protein, but the right type of protein, and a mix like this is highly unlikely to contain this. Yes your piglets will grow, but without the right type of protein, then much of the feed is expelled as nitrogen compounds and just wasted. This is why animo acids such as Lysine are added to feed.
For sow maintenance a lower protein level is needed (as this is cell replacement not muscle growth), so a less fit feed is needed. But you will still need to think about Lipids, carbohydrates, protein, vitamins and minerals that pigs need.
An unbalanced feed will at best be wasted feed, and is quite likely to just grow fat not muscle !
Is it cost effectiveFree food is generally cost effective, as if it takes 10 months to grow rather than 6, it has only cost you bedding and water. But if you are paying money, as soon as you start feeding a less than optimum diet, then the length of time vs. fat, vs cost equation comes in.
So lots of things to consider
Now don't let me put you off, but the "there must be a cheaper way" thread comes up quite often, and frankly if we could do it cheaper then we would all be at it, and there would be no bags of pig feed