Bone metabolism in poultry - Doug Korver

I agree because "all hens require a specific amount of nutrients to maintain production and skeletal structure. The skeleton and dietary requirements of hens are unique relative to the level of calcium consumed and the amount of bone that is constantly being built and resorbed".
Hence, rearing period is important to make a strong structural bone and management of sexual maturity to built a high medulary bone capacity, and managing feed preparation, distribution in the day, especially in laying period, is also important.

Hello Hiren Pancholi :

Eggshell is mainly inorganic minerals (95%) and about 95% of these minerals are calcium carbonate crystals. Trace elements are also involved in the eggshell in minor values, while their roles also may be important for enzymes activity and shell gland mucosal homeostasis. the less than 5% organic proteins involved in the eggshell also may require trace minerals for their conformation and thus normal eggshell biomineralization.
Adding zinc oxide in normal and nano forms enhanced eggshell quality in aged hens. Also vit D supplementation enhances eggshell quality and important for calcium mobilization as Dr. Doug Korver mentioned, 50% of eggshell calcium is derived from feed, and other half from medullary bones. This may be due to the importance of vit D for the expression of intestinal and uterine calbindin protein, which is related to the ability of tissues to capture calcium, also vit D is important for mucosal innate immunity and homeostasis which may be affected by aging or stress as we experienced in our studies.

Dr. Doug Korver,

Is there any role of Trace Minerals and Vitamins for skeletal formation in rearing period of Laying Birds and in the Old age birds?

Hello Mr. Dr Korver
Thank you for your lecture, Would you please explain, how we can maximize the bone calcium resource, especially during the rearing period? Although we know excessive calcium carbonate in the ration is harmful. I look forward to hearing from you.
Regards,
Sayed Mortazavi.

I agree with Dr. Korver, calcium is one of essential nutrients in the diet of laying birds. Calcium is necessary for egg formation. Eggshell is made up of 97% calcium carbonate.

Yes, I do agree with Dr. Korver, the logic is convincing and calcium supply needs to be increased in older birds.

I totally agree with the comments from Dr. Doug Korver. We need to maximize the reserve of calcium by strong structural bone during the rearing period and later on during all the lay period but especially during the start of lay period, trying to maximize the use of calcium from feed in order to protect the reserves of structural bone as long as possible. Recently I published an article in Avinews magazine about the same topic.

Yes, I would like to discuss about this topic in poultry.