Ibrahim, A., Beshara, M., Mohamed, H. (2015). EFFECT OF IODINE SUPPLEMENTATION TO LOW ENERGY DIETS ON PRODUCTIVE AND REPRODUCTIVE PERFORMANCE IN LAYING HENS OF LOCAL SINAI STRAIN. Journal of Animal and Poultry Production, 6(2), 99-135. doi: 10.21608/jappmu.2016.52733
A. F. Ibrahim; M. M. Beshara; Hanan S. Mohamed. "EFFECT OF IODINE SUPPLEMENTATION TO LOW ENERGY DIETS ON PRODUCTIVE AND REPRODUCTIVE PERFORMANCE IN LAYING HENS OF LOCAL SINAI STRAIN". Journal of Animal and Poultry Production, 6, 2, 2015, 99-135. doi: 10.21608/jappmu.2016.52733
Ibrahim, A., Beshara, M., Mohamed, H. (2015). 'EFFECT OF IODINE SUPPLEMENTATION TO LOW ENERGY DIETS ON PRODUCTIVE AND REPRODUCTIVE PERFORMANCE IN LAYING HENS OF LOCAL SINAI STRAIN', Journal of Animal and Poultry Production, 6(2), pp. 99-135. doi: 10.21608/jappmu.2016.52733
Ibrahim, A., Beshara, M., Mohamed, H. EFFECT OF IODINE SUPPLEMENTATION TO LOW ENERGY DIETS ON PRODUCTIVE AND REPRODUCTIVE PERFORMANCE IN LAYING HENS OF LOCAL SINAI STRAIN. Journal of Animal and Poultry Production, 2015; 6(2): 99-135. doi: 10.21608/jappmu.2016.52733
EFFECT OF IODINE SUPPLEMENTATION TO LOW ENERGY DIETS ON PRODUCTIVE AND REPRODUCTIVE PERFORMANCE IN LAYING HENS OF LOCAL SINAI STRAIN
Anim. Prod. Res. Institute, Agric. Res. Center, Ministry of Agric. Dokki, Giza.
Abstract
A total number of 297 Sinai hens (270 females and 27 males) 42-wks-old were used, weighed and divided into nine treatment groups, three replicates each, to investigate the effect of Iodine supplementation to low metabolizable energy (ME) layer diets in a factorial design (3x3) on laying performance, egg quality parameters, reproductive performance and nutrients digestibility as well as some blood constituents during the late stage of laying period (42-58 wks of age). The dietary ME of treatments were 2766 (as control); 2655 and 2565 kcal ME/kg, with three iodine levels of 0.3 (as control); 1.2, or 2.4, mg iodine/ kg diet. Results obtained could be summarized as the following:
1- Decreasing ME content in the Sinai layer diet resulted in a significant decrease in body weight and body weight gain (BWG) while diet supplemented with 2.4 mg/ iodinekg diet had the highest BWG compared to other groups. Also, BWG was significantly affected due to the interaction between iodine and ME.
2- Laying rate percentage and egg mass (g/hen) was significantly decreased by dietary contained 2565 Kcal/Kg diet. Conversely, the hens fed diet 1.2 and 2.4 mg I/Kg diet significantly improved the laying performance. Also, the superiority of the diet contained 2655 Kcal/Kg with 2.4 mg iodine /Kg diet where it was significantly greater laying performance than all other treatments.
3- No significant effect was observed on reproductive performance by feeding different levels of ME, while hatchability percentage was significantly improved as dietary supplemented with 1.2 and 2.4 iodine/ kg diet. Also, the best significant value of hatchability was recorded by the interaction between 2655 Kcal ME/ kg and 2.4 mg iodine/ kg diet.
4- Decreasing ME content from 2766 to 2655 and 2565 Kcal/kg diet showed linear significant higher feed consumption. While, only the low level of ME (2565 Kcal/Kg diet) significantly decreased feed conversion ratio compared to the control.
5- Iodine supplementation (1.2 and 2.4 mg/kg diet) resulted in a significant linear feed consumption decreased compared to the control diet. Also, hens fed diet contained 1.2 and 2.4 mg iodine/Kg diet produced significantly better feed conversion than control diet.
6- Feed conversion ratio was significantly improved by the diet containing ME 2655 Kcal/Kg diet + 2.4 mg I /Kg diet as compared to the control diet by about 15.5 %.
7- Digestion coefficient of Ether extract (EE) and ash retention were significantly increased by decreasing the ME to 2565 Kcal/Kg diet compared to the control diet (2766Kcal/Kg diet). All values of nutrients digestibility tend to be significantly linear increase for birds fed diets supplemented with 1.2 and 2.4 mg iodine/Kg layer diet as compared to control diet (0.3 mg I/Kg diet).
8- Dietary energy level has significant effect on blood metabolites, except triglycerides, and improved HDL concentration and thyroxin level, especially the low followed by the median ME level.
9- Dietary iodine supplementation, up to 2.4 mg/ kg diet improved blood parameters, hematological traits, T3 level, and T3/T4 ratio without any negative effects on liver function and immune responses, in terms of ALT, AST activity and WBC′s count.
10- The combined effect between low and median ME and high iodine is the best for different productive and physiological parameters.
11- Decreasing dietary ME content from 2766 to 2655 Kcal/Kg diet resulted in no significant effect in economic efficiency. On the other hand, the high level of iodine (2.4mg/Kg diet) with decreasing ME from 2766 to 2655 Kcal/Kg diet resulted in significantly higher economic efficiency than all other treatments.
The results illustrated that the adequate level of ME for Sinai laying hens was 2655 Kcal/Kg diet to maximize the productive performance under the condition of this study, however the combination of same level of ME (2655 Kcal/ Kg diet) and 2.4 mg iodine/ Kg diet is the most successful requirement for improving laying performance and reproductive performance for Sinai laying hens during the late stage of laying period (42- 58 wks of age).
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