عنوان

تأثیر منابع مختلف روی، بر عملکرد تولیدی و فراسنجه‌های خونی بلدرچین تخم‌گذار ژاپنی

Research Aim: This experiment was conducted to investigate the effects of different sources of zinc on performance, egg quality, immune system and some blood parameters of Japanese laying quails. Research method: Experiment was carried out using 160 Japanese layer quail at 90 day of age in a completely randomized design with 4 treatments, 4 replicates and 10 birds per replicate. The experimental groups: 1) Base diet as control group. 2) Basic diet + 50 mg zinc per kg of diet from zinc oxide (ZnO) source. 3) Base diet + 50 mg zinc per kg of diet from nano-zinc oxide (n-ZnO). 4) Base diet + 50 mg zinc per kg diet from zinc methionine (Zn-Met) source. Cammercial traits including feed consumption (FI), feed conversion ratio (FCR), egg production, broken egg, egg weight, egg weight, egg yolk characteristics and components including shape index, yolk index, shell resistance, , shell thickness and other traits were assessed and calculated. To calculate the production rate, average egg weight and feed conversion ratio, the number of quail eggs per day was counted and weighed daily. Feed intake was measured weekly. At the end of week 2, 6, 4 and 8, six quail eggs were sampled from each experimental unit and related characteristics were assessed. At the end of the experimental period, three quails were randomly selected from each experimental and group blood samples were taken to measure some blood parameters such as cholesterol, HDL, LDL, and triglyceride. Findings: The results showed that different sources did not show a significant effect on production percentage, average egg weight, egg mass, and feed intake (P<0.05). But the addition of Zn-Met, n-Zn and ZnO as compared to control significantly improved FCR (P <0.05). The organic Zinc consumption had the highest haugh unit and shell thickness than other experimental groups, especially the control group (P<0.05), but no significant difference was observed versus n-ZnO roup. The best quality of yolk index, shell resistance and yolk color were found in n-ZnO, which had a significants difference compared to other experimental and control groups (P>0.05). The cellular immune response 24 hours after phythemagglutinin administration was significantly higher in the n-ZnO group compared to the control group (P<0.05), but did not differ significantly with other groups. Different blood parameters of hepatic enzymes (alkaline phosphatase, alanine transferase, aspartate aminotransferase) and biochemical parameters (cholesterol, triglyceride, HDL, LDL) were not affected by experimental treatments (P<0.05). Crude ash and bone ash in n-ZnO treatment had the highest rates (P<0.05), but the ashs of yolk, albumen and meat were not affected by experimental treatments (P<0.05). Conclusion: According to the results, addition of Zn-Met can improve the quality and performance of Japanese layer quail in comparison with the nano and mineral supplementation