EFFECT OF VITAMIN K3 ON CHICKEN PRODUCTION PERFORMANCE AND BONE QUALITY 2-DURING GROWING PERIOD
Egyptian Poultry Science Journal
The present study was performed to study the influence of dietary supplementation of Mandarah female birds during the growing period with higher levels of vitamin K3 more than that recommended on growth performance, tibia bone parameters, X-Ray examination, histological observation and some blood parameters. Three hundred Mandarah chicken females were assigned in cages from 4 to 16 weeks of age. The birds were randomly divided into 5 groups with 3 replicates per each representing the dietary
... ting the dietary supplementations. The first group was served as control (T1) without any supplementation and fed basal diet containing 3 mg K3 / kg diet . The rest 4 groups were fed diet supplemented with menadion as additional doses of vitamin K3 source to be 5, 7,9and 11mg k3 / kg diet for T2, T3, T4 and T5 groups, respectively. Results revealed that during the whole experimental period (4-16 wks) of age, all extra supplementations of vitamin k3 resulted in a significant (P≤0.05) improvement in body weight gain and feed conversion ratio compared to those for control group (T1), besides T5 group realized the best significant record of body weight gain and feed conversion ratio compared with the rest experimental groups. Moreover, the best improvement of tibia parameters including length , width , breaking strength, weight, ash%,Ca% and P% were recorded for birds of T4 and T5 groups. Birds of T5 group (11mg k3/kg diet) had the highest values of the serum osteocalcin (OC) and plasma Ca, P, ionized calcium (ICa) and alkaline phosphatase (AP). X-Ray pictures of tibia bone for all vitamin K3 supplemented groups represented high bone density and did not show any incidence of osteopenia. Histological observations of tibia bone for birds of T3, T4 and T5 groups illustrate marked increase of trabecular bone density, osteocytes and periosteum. In conclusion, supplementing the diet containing 3 mg K3 / kg diet of Mandarah female birds during the growing period with vitamin k3 to be 11 mg vitamin K3 / kg diet could be recommended due to beneficial influence of these extra doses on improving growth performance, bone mass ,quality and strength .