Effect of Using Different Levels and Sources of Zinc in Layer's Diets on Egg Zinc Enrichment

Abstract

ABSTRACT:One hundred and twenty Golden Montazah laying hens (Egyptian local developed strain) aged 24 weeks were divided in two groups each group contains four treatments with two different supplemental sources of zinc, inorganic zinc as zinc sulphate (ZnSo4 7H2O) and organic zinc as zinc methionine to get concentration levels 0.0, 50, 100 and 150 mg supplemental zinc/kg diet to investigate the effect of different dietary levels and sources of zinc and their interaction on the zinc concentration of egg, the productive performance, some egg quality and some blood parameters of laying hens were also estimated. The experimental period lasted for 12 weeks in three subsequent interval periods (four weeks each). Results indicated that increasing zinc levels from 0.0 up to 150 mg/kg either as inorganic or organic significantly increased egg zinc concentration without any adverse effect on egg production. The highest concentration of egg zinc was observed for layers fed diet supplemented with 150 mg zinc/ kg diet as an organic Zn (Zn methionine). Supplementing laying hens' diet with zinc as zinc methionine significantly increased egg production. In that, 100mg supplemental zinc as Zn methionine gave the best feed conversion and egg mass. Also, organic zinc supplementation significantly increased plasma zinc, total protein, albumen, and globulin and improved A/G ratio. Albumen index and Haugh unit significantly affected by increasing zinc levels.In conclusion supplemented laying hens diet with 150 mg zinc as zinc methionine / kg diet gave zinc enriched egg which could supply 19.45 % of daily requirements of zinc for children from 1-8 years and additionally gave advancement in productive performance for laying hens.

Effects of Organic and Inorganic Forms of Manganese, Zinc, Copper, and Chromium on Bioavailability of These Minerals and Calcium in Late-Phase Laying Hens

“…In agreement with the findings of the present study, other studies have found that dietary organic Zn [16] or Cu [18] in laying hens and Mn [14] in broilers significantly increased the concentrations of these minerals in blood compared with inorganic sources. However, another study found that dietary organic Cr in broiler did not affect blood Cr concentrations [12].…”

“…Such organic structures are stable in the digestive tract and are preferentially absorbed because they are protected from forming complexes with other ration components [9]. Several reports have indicated that organic sources of trace minerals have a higher bioavailability than inorganic forms [6,[10][11][12][13][14][15][16].…”

Effect of Dietary Replacement of Inorganic Zinc by Organic or Nanoparticles Sources on Growth Performance, Immune Response and Intestinal Histopathology of Broiler Chicken

“…However, Güçlü and İşcan (2004) reported that organic Mn and Zn supplementation of laying hen diets did not affect serum Ca, P, and Mg concentrations. In another study, dietary Zn supplementation at different levels increased plasma Ca concentration, but plasma Ca was not affected by different Zn sources (Bahakaim et al, 2014). Under the conditions of the present study, addition of the trace mineral mixture in the organic form positively affected calcium and phosphorus bioavailability of broiler chicken.…”

Different trace mineral sources and recommendations in the performance and quality of eggs from Dekalb White layers

“…Such results were also observed in the study by Bittencourt et al (2011), in which eggs from birds that received CAPC in the diet had higher iron deposition. The study by Bahakaim et al (2014) demonstrated that birds fed diet supplemented with zinc-methionine presented higher values of this mineral when compared with the inorganic source. According to the same author, this increase may have occurred due to the higher bioavailability of the source.…”