by Pajarita » Wed Jun 03, 2015 6:24 am
Well, we do know what they eat in the wild but we can't duplicate it, especially since all birds are seasonal eaters so they eat one thing in June and a completely different thing in December, for example. And, even if we took the time to learn for a fact what the exact nutritional composition of their different diets are, captive birds have different needs than wild birds so, even though it would give us a good starting point, we could not really use the data for captive birds. Then add to that the fact that captive-bred birds are nothing but a poor copy of the wild specimen, weaker and less healthy than the wild birds (no natural selection) and you have practically apples and oranges. But there are things that remain the same because the digestive system of captive birds works the same way than the wild ones. And so we know that they are herbivores and not omnivores as most people believe, that their diet has a moisture content of 85-95%, that they eat less protein during the resting season than during the breeding one and that not all protein is the same with some been of higher quality than others, that they need lots of the right kind of fiber (this is another problem with pellets), fat content varies by species with the macaws requiring more than others, same with protein, some species can stand more (grays and sennies, for example) while others need less (amazons and conures, for example), etc. And we know that some species don't really eat fruits (like cockatiels) while others eat A LOT of it (GCCs, lories, etc). We do know a lot, it's just a matter of putting together a diet that works for your bird.
Now, as to spinach, I never feed it to my birds, same as parsley, collard greens and beet greens. Too high in oxalic acid and too easy to replace with other nutritious greens for me to consider them (I try to make my life easy if I can). I feed all three types of kale, mostly romaine lettuce but also Boston, escarole, chicory, dandelion greens, celery greens as well as all three types of Swiss chard, cabbages like green, red, savoy, nappa, bok choy. I also feed arugula, radicchio, endive but only once in a blue moon because arugula is too high in iron (birds don't need a lot of it and, if you feed too much, it gets stored in the liver which is bad for them), endive is too expensive (I have a lot of birds) and the birds are not really that fond of radicchio. They also get some fennel tops every now and then (they do like those as well as the root).
Pellets are a hot topic. Personally, the way I look at it, they are too dry (max 10% which is way too low for an animal that eats an average of 90% moisture and it's not hard-wired for frequent drinking), they don't offer complete nutrition (no phytonutrients- so I still have to offer food prepared by me), I don't like not knowing how much protein I am feeding (I have birds that have liver and kidney issues) and, unless you buy Tops, you are not feeding human grade ingredients (and I worked in the grain industry for 10 years and I know there is a difference) so the only thing I could use them for is to substitute for seeds and they are too expensive for that plus the birds love seed while you have to train a bird to eat pellets. So, where is the actual benefit? People usually feed them because that is what avian vets normally recommend but three of them have admitted to me that they know they are not the best option and that they recommend them because, and I am quoting one of them, they are the 'lesser evil" as they don't trust people to feed their birds right. But I think that is an antiquated concept because parrot keepers nowadays don't just fill up a bowl with either seeds or pellets, they do feed veggies, fruits, greens, sprouts, cooked whole grains, etc.
Do pellets kill birds? I think they do in the long term but you will never find a single vet that could say this from a necropsy because the actual causes of death are failure of internal organs. It's like drinking alcohol, it destroys the liver but the cause of death is not alcoholism but hepatic failure from cirrhosis, right? With humans and animals that have been domesticated for thousands of years like dogs, cats, horses, etc. we do have long term dietary studies but there are none with parrots. They are a fairly recent fad (not more than 20 years or so) and so we have no long term studies on anything but we do know of birds that have died from hepatic lipidosis, eggbinding, renal failure, etc that ate only pellets the same way that we know of birds that have died of the same problems eating only seeds. The key is to not use them as complete nutrition and only as a measured source of protein but that goes for seeds, too, and they are not only cheaper, the birds love them while you need to train a parrot to eat pellets which are also more expensive so why bother?
I feed gloop with raw produce (a different veggie, fruit and green every day) for breakfast and all day picking and a measured portion of a good quality seed mix and nuts for dinner. I've been doing this for 20 years and my birds all do very well on it so I am satisfied and the birds are happy.