My two female Esatern Grays Scratchy and Runty are having their second babies of their life outside in the wild (of my backyard), coinciding quite well with the average birth dates for spring per Kropowski et.al where births average is on February 27 (out of 86 females sampled in a university study in Arizona), so I got into action preparing lots of nuts, veggies, avocado, corn and Fox Valley infant formula to keep them going strong and helping with milk production.
So serendipitously I prepared today a mix of FV in a mousse ceramic bowl and not wanting to have it spilled over I attached a very strong magnet underneath with a piece of 3M VHB tape (Very High Bond) and magnetically locket it in place to the top of our ceramic tiled BBQ which has a heavy steel plate. This is where they come twice a day to get their nuts and freshies. Everything went well, Scratchy came an lapped the milk leaving none for her sister Runty who also has given birth 1 or 2 days appart. So I rushed to my lab sink to wash the bowl and make a new batch for Runty, and upon rinsing it with tap water, I noticed a certain amount of greyish particles attached on the bowl's bottom, held in place by the magnets force lines. I scraped them out and under microscopic examination, it turned out to be steel or iron particles, very fine of about 50 to 150 microns in size.
The FV powder I have is still in the original bag I got it in, and was purchased about October 2012. Kept it in the freezer from when I released the girls out on Thanksgiving 2012.
Scratchy seems to be doing O.K. and eating well this afternoon, so I am only mentioning this as a link to the earlier thread about FV giving diahrrea to pinkies. I don't know if metalic particles could do that to the tender tiny GI system of a pinky, but I mention it just in case. I sifted the dry FV formula with a magnet wrapped in a plastic baggie and found more metal particles in it. Unfortunately the FV bag I have does not have a batch or date stamp as others did use to come with, so I cannot offer that info, only that it was bought about Sept-Oct., 2012.
Hope that if you have FV in stock, you can do the magnet test and see if it too has the same response as I had.
Regards,
Trooper's dad