Thanks, a few people seem to like my signature.
About the feed you're giving them, sounds generally quite good, but it's variable in whether shop bought food, or food that's been in refrigerators, is contaminated. Even seemingly clean fridges often contain nasty bacteria capable of making chooks sick, and shopbought food.. What can you say? It's loaded.
I don't give my animals storebought grapes, can rarely eat them myself, in Australia they are more often than not just reeking of human gastrointestinal bugs, which smells like sickly fecal matter. Don't know if it's from the 'atmosphere' in shops (all those people expelling gases and sneezing/coughing etc all day in shops all over the produce) or due to fertilization using human manure (I've worked on grape farms before and many farmers would panic at the idea of someone eating their grapes off the vine because of the chemicals and waste used on them. Potential lawsuits galore). But when we used to let chooks and other animals eat our leftover/old grapes, they would always get sick, and the same applies to many other fruits.
I generally practice more biosecurity in my kitchen and house than outside it as in my experience most gastrointestinal upsets my chooks had came from humans. School age kids are veritable vectors of parasites and diseases. Some of my animals refuse to eat treats they normally can't resist from a child's hands due to the bacteria they can smell there, and I'm not postulating that because I can smell it on them too. Often you can smell the same smell in a chooks' poop that's just been produced by kids with stomach upsets they picked up from school and the same smell and diarrhea goes through most domestic species we have, dogs, cats, sheep etc despite the physiological differences... Soon enough the animals learn what's making them sick and try to avoid it. If I'm not careful with not introducing normal human bacterias from our kitchen, fridge, etc, into their food, often as not they get sick. Almost impossible to maintain enough hygiene with kids of school age, every main doorknob is contaminated every day multiple times. Disinfecting the doorknobs is one way to stop disease spreading as odd as that may sound.
I'm not sure about the suet though, excess fat can be quite harmful to their livers and hearts... Added fat isn't normally a part of a diet known to do poultry too much good in the long term, especially depending on what breeds they are as some, particularly laying and meat breeds, are very prone to excessive fat laydown internally and in the liver which is a fairly common cause of ill health and death among them on diets not fat-restricted.
Some have been bred to crave more fat than they need and can't process it correctly so while they will always go nuts for it, it is life threatening to give them more than what comes in their pellets or the raw fats they find in seeds, insects etc. On that topic raw fat is far better for them than cooked, same as with all proteins and oils. A little bit of cooked stuff won't hurt, doesn't really sound like you're overdoing anything, but some individuals/strains/breeds can't cope with what others can. If their poop always stinks and is always runny I'd treat them. I'd add a clove or two per bird of raw garlic to that feed personally, I use it as a staple with mine because it's often been quite the lifesaver and it's completely ensured I've never had a cocci case among mine.
Depending on how long you let the chopped grass sit before feeding it to them, it could be building up dangerous levels of gas inside them and giving them upset stomachs so to speak because it begins to decompose rapidly once cut, even while looking fresh it can be an issue. It's one of those things, generally they're fine, you never have problems, or they're not fine and you do have problems. Most horse owners would be aghast at the idea of giving a horse lawnmowing clippings but some do it religiously with no problems. Then again plenty of others die from it. I'm not sure why there is such a discrepancy there to be honest. Also the length might be an issue, causing it to ferment for longer than normal, since when allowed to pick their own grass I rarely see them take more than an inch at a time.
Yeah, the Aussie monitors are pretty interesting, I've had to remove a few from coops before and even wild ones show a lot of keen intelligence and sharp observation and perception skills.
Best wishes.
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