Update: (with past documented weights for comparison)
Initital Weight
Scale #1 - 3lbs 9.0 ounces
Scale #2 - 68.3 ounces
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Weight and pics of poop after 2 days of crop tube feeding.
Weights
Scale #1 - 4lbs 1.5 ounces
Scale #2 - 69.3 ounes
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Weight Gain
Scale # 1 - 0.25 ounces
Scale # 2 - 0.8 ounces
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7/16/2013 Weigh In
Scale #1 - 4lbs 1.9 ounces
Scale #2 - 75.25 ounces
PAST Weight Gain
Scale # 1 - 0.04 lbs
Scale # 2 - 5.95 ounces
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RECENT UPDATES ARE LISTED BELOW:
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7/17/2013 Weigh In
Scale #1 - 4lbs 6.2 ounces
Scale #2 - 83.2 ounces
Weight Gain from Last Weigh In: 0.43 ounces/7.95 ounces (Numbers from 2 scales)
Weight Gain from Initial Weigh In: 1lb .02 ounces OR 13.9 ounces. This gain is over the course of 7 days from first noticing my bird was not acting itself.
Poop Pic From 7-17-2013;
Looks Firmer. Looking Good.
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7-18-2013 - This time, I noticed that he was eating, so I purposely didn't crop feed so that I could get an idea of how much he was eating and to find out how much would be weigh (gain or loss) due to me NOT crop feeding. He dropped a little because I did not crop feed. Wanted to confirm that crop feeding his helping him eat and gain weight.
Scale #1 - 4lbs 3.7 ounces
Scale #2 - 75.2 ounces
Weight Loss From Last Weight in: 0.25 ounces - Because I purposely did not crop feed, my bird lost 0.25 ounces.
Poop does not look as firm as it did the day before.
7-19-2013 - Did not crop feed again on purpose for comparison again.
Scale #1 - 4lbs 2.7 ounces
Scale #2 - 75.3 ounces
Poop is looking a little firmer than 7-18-2013.
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7-20-2013 - Did not crop feed again on purpose for comparison again.
Scale #1 - 4lbs 3.9 ounces
Scale #2 - 76.3 ounces
Scale #1 - Weight Gain of 0.12 ounces
Scale #2 - Weight Gain of 1.0 ounces
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From Beginning To Present, he has gained an average weight of 8 ounces (if my calculations are correct). So many numbers. :/
If he would have lost these same 8 ounces or more because I didn't crop feed him, he would have been almost 2 lbs. So it is evident that crop tube feeding is working for my boy and it will work for others.
I will continue to weigh and will continue to crop tube feed so that he can gain more weight. I currently have him eating Flockraiser 20% protein (in addition to the Bird Feed Formula) but I think I will purchase Game Bird Feed 28% protein to up the protein for quicker weight gain. I think that he can benefit more with a higher protein feed (crumble). I must add that I changed the feed from pellets to crumble, so that he would have no problem eating his feed. I have decided to take a poop sample to the vet to see if they can tell me anything.
He had a surprising milestone on last night and I was so proud of him. For 2 weeks, he had been sleeping on the ground. When I started crop feeding him, I could tell that he was feeling better because he had more energy and was walking and trotting around. He had been looking at the roost and had made on many attempts the squatting motion/position as if he wanted to jump on the roost but I don't think that he had enough energy. Well, last night, I went out to check on him and he had already jumped on the roost and was roosting.

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All I could do was smile and Thank God that he accomplished what he had been trying to do all week. To me, that is an indication that he is getting better.
I will continue to update every couple days to keep everyone posted. We are still not out of the woods yet, but I am doing everything to get him better.