Switching hand fed Formula from one brand to another. The Birds are refusing to accept it. What should I do?

[MoeMania]

Hello Everyone,

I have just recently changed my birds hand feeding formula from Kaytee Eaxact to Roudybush Formula 3. They stopped feeding after one or two feedings. I have a Miligold Macaw , Blue and Gold Macaw and a Hyacinth Macaw. What should I do? should I mix the old formula with the new one? its been almost 18 hours since their last meal. How can I fix this situation? I need help before going to the vet and seeing the drastic weight change. Please if anyone can help, please advise.

Thank you,
Mohammed

 

[T. gillii]

Why did you switch them? Is the Kaytee unavailable?

 

[MoeMania]

Why did you switch them? Is the Kaytee unavailable?

Yes it's unavailable so I had to make a shotgun decision to pick a second in hand feeding formula to make sure their diet is still going. I have a little of the old Kaytee still left should I mix the both formulas together or just wait till they are hunger driven to accept the new formula.

 

[T. gillii]

Yes it's unavailable so I had to make a shotgun decision to pick a second in hand feeding formula to make sure their diet is still going. I have a little of the old Kaytee still left should I mix the both formulas together or just wait till they are hunger driven to accept the new formula.

How old are the chicks?

 

[MoeMania]

The Miligold is about 4 months , the blue and gold is about 3 months and the hyacinth is about 13 months old.