![Black and white 2 fixed aging cracked wheat](https://kumkoniak.com/39.jpg)
![black and white 2 fixed aging cracked wheat black and white 2 fixed aging cracked wheat](https://cimg0.ibsrv.net/gimg/www.crossfireforum.org-vbulletin/2000x2000/74fadd6f_d59d_438e_81b2_61d84ea4938c_319ff89963656028981e8cc9b82b92d8544733e2.jpeg)
As this bottleneck becomes even more limiting in aging hens, better results are expected when using an active metabolite - but this has not been unequivocally confirmed.
![black and white 2 fixed aging cracked wheat black and white 2 fixed aging cracked wheat](https://kasorganics.com.au/_content/img/f79f7cc7.jpg)
Nevertheless, there is a natural bottleneck in vitamin D metabolism, which can be by-passed by using an active metabolite of vitamin D, instead or in addition to the usual form.
![black and white 2 fixed aging cracked wheat black and white 2 fixed aging cracked wheat](http://2.bp.blogspot.com/-TjYs2FWStQU/Uk5cclInE1I/AAAAAAAAE4c/dl9JOelcpdQ/w1200-h630-p-k-no-nu/IMG_0116_1.jpg)
Thus, high levels of dietary vitamin D can influence positively eggshell quality. Vitamin D is part of the calcium-phosphorus homeostasis within the organism. How this might relate to older hens is still unknown. Thus, most layer diets tend to have low levels of phosphorus, but this can cause its own problems: it has been reported that when phytase is part of the phosphorus equation, then the already marginal dietary phosphorus levels can become limiting if phytase efficacy is impaired. Here, the effect of this mineral can be antagonistic to that of calcium, as too much dietary phosphorus reduces intestinal calcium absorption. Phosphorus is the second most influential mineral regarding eggshell quality. In addition, adding organic acids and extra vitamin D have been shown to further improve the calcium balance, and consequently egg shell quality. Thus, adding a more digestible source or form of calcium is recommended for diets during the last phase of egg production. To this end, enhancing calcium digestibility and absorption appears to be a viable alternative. With age, calcium digestibility and metabolism are impaired, while adding excessive amounts of dietary calcium only makes things worse. As they deposit a fixed amount of calcium per egg (2 grams), and calcium is the main element that provides strength to the shell, it is expected for a larger egg to have a thinner shell. The main reason why older layers produce more cracked eggs has to do with egg size.
![black and white 2 fixed aging cracked wheat black and white 2 fixed aging cracked wheat](https://flyingpowerup.weebly.com/uploads/1/2/4/2/124291376/466239519.jpg)
Cracked eggs among older hens can exceed 20 percent, and for obvious reasons, these eggs are a negative mark for the egg industry. Aging hens produce larger, albeit more fragile, eggs.
![Black and white 2 fixed aging cracked wheat](https://kumkoniak.com/39.jpg)