University of Guilan Animal Production Research 2252-0872 8 4 2020 02 20 Effect of different levels of organic chromium on performance and egg quality characteristics of laying hens reared at high stock density Effect of different levels of organic chromium on performance and egg quality characteristics of laying hens reared at high stock density 51 63 3534 10.22124/ar.2019.12453.1382 FA S. Salari Associate Professor, Department of Animal Science, Agricultural Sciences and Natural Resources University of Khuzestan, Mollasani, Khuzestan, Iran E. Boazar MSc. Student of Poultry Nutrition, Department of Animal Science, Agricultural Sciences and Natural Resources University of Khuzestan, Mollasani, Khuzestan, Iran N. Rashidi Sabbatical leave student of Department of Animal Science, Agricultural Sciences and Natural Resources University of Khuzestan, Mollasani, Khuzestan, Iran Journal Article 1970 01 01 <span style="line-height: 107%; font-family: 'Times New Roman','serif'; font-size: 10pt; mso-fareast-font-family: Calibri; mso-bidi-language: FA; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-fareast-theme-font: minor-latin; mso-ascii-theme-font: major-bidi; mso-hansi-theme-font: major-bidi; mso-bidi-theme-font: major-bidi;">In order to study the effects of <span style="line-height: 107%; font-family: 'Times New Roman','serif'; font-size: 10pt; mso-fareast-font-family: 'Times New Roman'; mso-bidi-language: FA; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-ascii-theme-font: major-bidi; mso-hansi-theme-font: major-bidi; mso-bidi-theme-font: major-bidi;">various levels of organic chromium on performance and egg quality <span style="line-height: 107%; font-family: 'Times New Roman','serif'; font-size: 10pt; mso-fareast-font-family: Calibri; mso-bidi-language: FA; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-fareast-theme-font: minor-latin; mso-ascii-theme-font: major-bidi; mso-hansi-theme-font: major-bidi; mso-bidi-theme-font: major-bidi;">characteristics of laying hens reared at high<span style="line-height: 107%; font-family: 'Times New Roman','serif'; font-size: 10pt; mso-fareast-font-family: 'Times New Roman'; mso-bidi-language: FA; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-ascii-theme-font: major-bidi; mso-hansi-theme-font: major-bidi; mso-bidi-theme-font: major-bidi;"> stock density, an experiment was done using two levels of density (three and five birds per cage) <span style="line-height: 107%; font-family: 'Times New Roman','serif'; font-size: 10pt; mso-fareast-font-family: Calibri; mso-bidi-language: FA; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-fareast-theme-font: minor-latin; mso-ascii-theme-font: major-bidi; mso-hansi-theme-font: major-bidi; mso-bidi-theme-font: major-bidi;">and four levels of organic chromium (0, 300, 600 and 900 ppb) with 192 laying hens (Hy-line W-36) in a completely randomized design with factorial arrangement of 4×2 with six replicates. <span style="line-height: 107%; font-family: 'Times New Roman','serif'; font-size: 10pt; mso-fareast-font-family: 'Times New Roman'; mso-bidi-language: FA; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-ascii-theme-font: major-bidi; mso-hansi-theme-font: major-bidi; mso-bidi-theme-font: major-bidi;">The results showed that dietary supplementation of chromium at normal and high stock density had not significant effect on performance of layers. Egg weight significantly increased at levels of 600 and 900 ppb (56.96 and 56.91 g) and feed intake significantly decreased (99.34 vs. 105.05) in birds reared at high stock density compared to the birds reared at normal stock density (p <0.05). In the first four, second, and whole periods of sampling, dietary inclusion of chromium at normal and high stock density, increased significantly egg yolk color and egg shell strength compared to the control (p <0.05). Dietary supplementation of chromium at normal and high stock density had not significant effect on blood parameters and tibia charachteristics of layers. In general, the results of the experiment showed that by increasing dietary supplementation of chromium at high stock density up to 900 ppb, egg yolk color and egg shell strength significantly increased in laying hens. <span style="line-height: 107%; font-family: 'Times New Roman','serif'; font-size: 10pt; mso-fareast-font-family: Calibri; mso-bidi-language: FA; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-fareast-theme-font: minor-latin; mso-ascii-theme-font: major-bidi; mso-hansi-theme-font: major-bidi; mso-bidi-theme-font: major-bidi;">In order to study the effects of <span style="line-height: 107%; font-family: 'Times New Roman','serif'; font-size: 10pt; mso-fareast-font-family: 'Times New Roman'; mso-bidi-language: FA; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-ascii-theme-font: major-bidi; mso-hansi-theme-font: major-bidi; mso-bidi-theme-font: major-bidi;">various levels of organic chromium on performance and egg quality <span style="line-height: 107%; font-family: 'Times New Roman','serif'; font-size: 10pt; mso-fareast-font-family: Calibri; mso-bidi-language: FA; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-fareast-theme-font: minor-latin; mso-ascii-theme-font: major-bidi; mso-hansi-theme-font: major-bidi; mso-bidi-theme-font: major-bidi;">characteristics of laying hens reared at high<span style="line-height: 107%; font-family: 'Times New Roman','serif'; font-size: 10pt; mso-fareast-font-family: 'Times New Roman'; mso-bidi-language: FA; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-ascii-theme-font: major-bidi; mso-hansi-theme-font: major-bidi; mso-bidi-theme-font: major-bidi;"> stock density, an experiment was done using two levels of density (three and five birds per cage) <span style="line-height: 107%; font-family: 'Times New Roman','serif'; font-size: 10pt; mso-fareast-font-family: Calibri; mso-bidi-language: FA; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-fareast-theme-font: minor-latin; mso-ascii-theme-font: major-bidi; mso-hansi-theme-font: major-bidi; mso-bidi-theme-font: major-bidi;">and four levels of organic chromium (0, 300, 600 and 900 ppb) with 192 laying hens (Hy-line W-36) in a completely randomized design with factorial arrangement of 4×2 with six replicates. <span style="line-height: 107%; font-family: 'Times New Roman','serif'; font-size: 10pt; mso-fareast-font-family: 'Times New Roman'; mso-bidi-language: FA; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-ascii-theme-font: major-bidi; mso-hansi-theme-font: major-bidi; mso-bidi-theme-font: major-bidi;">The results showed that dietary supplementation of chromium at normal and high stock density had not significant effect on performance of layers. Egg weight significantly increased at levels of 600 and 900 ppb (56.96 and 56.91 g) and feed intake significantly decreased (99.34 vs. 105.05) in birds reared at high stock density compared to the birds reared at normal stock density (p <0.05). In the first four, second, and whole periods of sampling, dietary inclusion of chromium at normal and high stock density, increased significantly egg yolk color and egg shell strength compared to the control (p <0.05). Dietary supplementation of chromium at normal and high stock density had not significant effect on blood parameters and tibia charachteristics of layers. In general, the results of the experiment showed that by increasing dietary supplementation of chromium at high stock density up to 900 ppb, egg yolk color and egg shell strength significantly increased in laying hens.

https://ar.guilan.ac.ir/article_3534_75cc10522905489fb372e815c8d5d356.pdf