Feeding Programs and Addition High Levels of Calcium, Phosphorus and Vitamin D3 to Aged Laying Hens’ Diets on Productive Performance

Abstract

Abstract This study was conducted in poultry farm belong to Department of Animal Production/College of Agriculture/University of Anbar from 15/3/2022 to 6/6/2022 (84) days, 3 periods (28 days/period). The aim of studying was studying effect of feeding programs and addition high levels of Calcium, phosphorous and vitamin D3 to aged laying hens’ diets on productive performance. In this study, 150-layer hens of Lohmann Brown breed, aged 52 weeks were used in this experiment. Laying hens were distributed randomly to ten treatments with five replicates per treatment (3 hens/replicate) in close system (cages). A completely randomized experimental design with a 2x2x2 factorial arrangement consisting Morning feeding with once time (A1), Evening feeding with twice times equal half (A2) 6 hours difference between the first and second period. Feed Additives (B) included: B1(3000 IU vitamin D3, 3.5% Ca and 0.5% P). B2(5000 IU vitamin D3, 4% Ca and 0.6% P.), B3(5000 IU vitamin D3, 4.5% Ca and 0.7% P), B4 (7000 IU vitamin D3, 4% Ca and 0.6% P), B5 (7000 IU vitamin D3, 4.5% Ca and 0.7% P). During the experimental periods hen’s performance traits included egg production H.D%, egg weights, egg mass, feed consumption, and feed conversion ratio were recorded. The results of statistical analysis showed that no effect of feeding programs A1 and A2 on productive performance which included egg production (H.D %), egg weight, egg mass, feed consumption and feed conversion ratio.