There's a big difference between "Nutriberries", and "Pelletberries"; Nutriberries are not meant to be a part of his diet, they are only occasional treats! Pelletberries are LaFaber's pellet to be fed daily as his staple food...So please don't start giving your bird Nutriberries like you would pellets, as they are full of sugar, fat, and are only to be given occasionally as treats...
What type of pellets are you trying to feed him? Sometimes you do have to try several different brands/types of pellets before you find one they'll transition to (that's assuming that you are using a transition-plan, like the one Gail posted from Harrison's, which is the absolute best pellet-transition plan I've seen)...
Also, as long as you're feeding him a healthy, low-fat seed-mix as his diet "staple", then he's okay and you can take your time in trying to properly transition him onto pellets (he needs to be eating a "staple" every day, either pellets or seeds, as fresh veggies and fruit will not sustain him, nor provide him with the daily nutrition he needs to be healthy)...However, if you're feeding him a seed-mix that contains sunflower-seeds,
then it's not a healthy, low fat seed mix, and you need to change it up to a much better one!
He can only eat what you give him!!! There are many, many healthy, low-fat seed-mixes available both online and in pet shops all over the world that contain No Sunflower Seeds, No Peanuts Or Any Other Nuts, No Corn, and No Sugary, Fruit-Flavored Pellets! If you choose one of these healthy, low-fat seed-mixes that contain no sunflower seeds, no corn, no peanuts or other nuts of any kind, and no fruit-flavored pellets, then you don't need to transition him onto a Natural Pellet so quickly...
****Some of the more common and highest-quality Seed-Mixes that you have to choose from include Tropimix (which actually contains Tropican Pellets in it), Higgin's VitaPrima California Blend and the No-Sunflower Seed Blend, SunSeed VitaSeed with No Sunflower Seeds, Zupreem Sensible Seed, and most of the Volkman Seed Mixes...You just need to read the bag/ingredients and make sure that there are No Sunflower Seeds, No Peanuts or other Nuts, and No Corn...those are the big ones. Then you can feed this to him, he'll eat it willingly as his daily "staple", and give him fresh Veggies every day as well (and occasionally fresh Fruit, although it contains tons of sugar too, which turns into fat and is stored in the liver just like the sunflower seed and peanut fat is, so give fresh fruit sparingly)...Then you can start trying to transition him slowly onto a Natural Pellet, and he'll still be eating a healthy, low-fat diet. Right now he's eating a seed-mix as his dietary staple that is full of fat, and yes, they will always pick out the sunflower seeds first, sometimes that's all they'll eat. Sunflower seeds should be given occasionally as treats, just like all types of nuts should be...and Corn, well, they really shouldn't get any Corn at all, except the occasional popcorn as a treat. Corn kernels found in fatty seed-mixes are horrible for them too...
I switched all of my birds about a year ago from Zupreem Natural Pellets and Higgin's VitaPrima California Blend to both Tropican Pellets and Tropimix Seed Mix (I am one who feeds BOTH a Natural Pellet and a healthy, low-fat seed-mix every day)...and they all love both the Tropican Pellets and the Tropimix Seed Mix...The only reason I switched to the Tropimix Seed-Mix from the Higgin's VitaPrima California Blend was because the Tropimix Seed-Mix also contains the Tropican Pellets in it, so they actually get their pellets alone and then again as a part of their seed-mix, so they're actually willingly eating more pellets without realizing it, and they love it too! Though the Higgin's VitaPrima mixes are also great, as long as they are the non-sunflower ones; the VitaPrima California Blend is awesome and they loved it as well...
