Some forty years ago, my former colleague Dr Koos van Middelkoop found a lot of deformed follicles (and yolks) in broiler breeder hens that were producing a lot of abnormal eggs (compressed side etc) and double yolked eggs. If I remember correctly his data were published in 1973/74 in Archiv fur Geflugelkunde and in his thesis at Wageningen University (The Netherlands) from January 1974.
His conclusion was, that selection for rapid growth of the broilers derailed the proper formation of yolks on the ovary in their mothers and that some yolks went into regression and later started growing again. All in all, he had some hens with a 150% yolks being produced, thus much more than the "normal" 85 % at that time in those hens.
Thanks so much, C.A. (Kees) Kan, I offered laying chickens varying dosage of honey in the drinking water and noticed deformed yolk in the reproductive tracts of hens with highest dosage. I could not fish out the reason.
The presence of mycotoxins in the diet can also lead to deformations in the follicles
Deformed or regressing yolk could be caused by 1- Bad water, check the chlorine content of that water, is it normal, 2- the health status of the bird and its age esp newcastle disease and Coccidial organisms 3- Check the feed ingredients components, what is the ratio of Calcium to phosphorus 4- higher dosage of honey had been implicated in the reproductive dysfunction by-way
Best wishes
I agree with the meaning of M-r Silas
" 3- Check the feed ingredients components, what is the ratio of Calcium to phosphorus"
Vesna
One addition to my previous answer; we only saw the deformations in the laid eggs after dosing the hens with the fat soluble dyes sudan red and sudan blue. Then we did not observe the very nice concentrical rings described in literature, but rather very strange twisted colored patterns. This although the outside of the yolks was normal in shape.
So it was impossible to determine how long the final phase of yolk formation had taken.
Pastor Silas, can you please direct me to literature on No 4 on (higher dosage of honey had been implicated in the reproductive dysfunction by-way). Thank you sir.
Effect of honey on reproductive system of poultry appear to be a future research endeavour.
in my opinion the deformed follicle condition broiler breeder is the outcome of multifold reasons. some of them are 1) too early photostimulation 2) improper ca , p and d3 ratio 3) higher mycotoxin in feed and chemical pollutant in drinking water 4) disease conditions 5) managemental and environmental stress.
Respiratory disease can induce some deformity in egg. thin white egg shell are seen.
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