Damizlik Yumurtaci Tavuk Rasyonlarina Bitkisel Kaynakli 1.25-dihidroksikolekalsiferol Katilmasinin Yumurta Kabuk Kalitesi ve Kuluçka Sonuçlarina Etkisi

The aim of this study was to determine effects of herbal 1.25-dihydroxycholecalciferol (1.25(OH)D ) supplementation on the eggshell quality and hatching results in layer breeders. The experiment was performed at breeding hen house containing 20000 layer breeders (38 weeks old) which belongs to joint-stock company Hastavuk. The diets used in experiment also were prepared at the same company. During experiment (38th th weeks), layer breeders in control group were fed with standart layer breeder diets, while treatment group were fed diet containing 10 ppm of herbal 1.25(OH)D differently from control group. A significant improvement was determined in eggshell quality at 40th (P<0.05) and 48th (P<0.01) weeks and in eggshell breaking strength at nd (P<0.05) week in treatment group supplemented fed with 1.25(OH)D . However, when the measurements performed during experiment were evaluated totally (38th th weeks), there was no significiant difference between control and treatment group in eggshell quality and hatching results. It was concluded that the supplementation of 1.25(OH)D (active form of vitamin D) to the diets of old layer breeders who has an irregular Vitamin D metabolism may be effective.