Effect of Tyrosine , Tryptophan and Canthanthin Either Alone or in Combination on Productive Performance of Egyptian Developed Laying Hens in Post-Peak Egg Production Period , in Presence or Absence of Sodium Sulphate

Abstract

This study examines the hypothesis that tyrosine and tryptophan and canthanthin either alone or in combination in absence or presence of sulphate ion, can improve the performance of local laying hens in post-peak period (39-58 weeks). A total number of 360 hens plus 36 cocks 39 weeks old from Inshas strain were equally divided into 12 group with 3 replicates (10 hens+ 1 cocks each) and housed in wire cages. The experimental hens fed from 39 to 58 week of age the control diet without or with 6 ppm Canthaxanthin (CAN) , 0.05% tyrosine(TYR) , 0.05% tryptophan(TRY) , 6 ppm CAN + 0.05% TYR, 6 ppm CAN + 0.05% TRY. The rest of treatments from were fed the same previous treatments plus 0.5 % anhydrous sodium sulphate (SS). The most important results obtained were as follow: 1-All dietary feed additives used in this study increased egg number, egg mass and shell thickness. 2-The addition of SS increased the beneficial effect of CAN, TYR and TRY. 3-The carotenoids like CAN with TYR or TRY in presence or absence of SS can improve the egg production, fertility and hatchability of developed laying hens in post-peak period. In conclusion, the mixture of CAN+TYR+SS was the most successful additive on productive performance.

Strengthening the Antioxidant Status of Laying Hens Through Summer Season by Using Different Categories of Antioxidant Sources

“…Regarding the general effect of treatments, the mixture of additives G+C, G+T, T+C and G+T+C were improved egg quality compared to single additives. These results in agreement with those reported by Ali et al (2018) who reported improved yolk color score by using C to laying feed. The increase in yolk color may be due to increase in the C in the yolk (Ali et al, 2018) and increased lycopene content when fed T. This results agree with Knoblich et al, (2005) who also reported increase in the lycopene content of egg yolk from laying chicken fed tomato seed and peels which affected the visual appraisal of egg yolk pigmentation and altered the carotenoid content.…”

“…These results in agreement with those reported by Ali et al (2018) who reported improved yolk color score by using C to laying feed. The increase in yolk color may be due to increase in the C in the yolk (Ali et al, 2018) and increased lycopene content when fed T. This results agree with Knoblich et al, (2005) who also reported increase in the lycopene content of egg yolk from laying chicken fed tomato seed and peels which affected the visual appraisal of egg yolk pigmentation and altered the carotenoid content. In this respect, Habanabashaka et al, (2014) observed increased significantly in yolk color and yolk carotenoid content (including lycopene) with increasing levels of tomato west meal (0, 3, 6, 9 % in laying diets) therefore hen can be a way of increasing the lycopene content of poultry eggs.…”

“…This superiority effect by adding mixture may be due to the C, which may be enhance the total antioxidant effect. The obtained results agree with Ali et al, (2018) who recorded significantly increasing egg number, egg mass by the mixture containing C more than single supplementation. This may also due to the multi effect of carotenoids in physiological processes as an antioxidant, a protective and recycle role for other fat soluble antioxidants like vitamins E and A (Surai and Speake, 1998) and protect hormones like estrogen from free radical and consequently increased egg number (Ali et al, 2012).…”

“…Also, canthaxanthin increased T3 and estrogen hormones and protect it from free radical and consequently increased egg number. In this respect, Ali et al, (2018) recorded that, using canthaxanthin increased significantly egg number by 23.35%, egg mass and shell thickness. Also, canthaxanthin has been used as a feed additive to resist oxidative stress caused by numerous factors including but not limited to high environmental temperatures (Ma et al, 2005), high stocking densities (Simitzis et al, 2012), and pathological conditions (Georgieva et al, 2006).…”

Using Feed Additives to Produce Functional Eggs in Fayoumi Hens.

“…One of feed additive used to resist oxidative stress caused by numerous factors including but not fixed to high temperatures (Ma et al, 2005). Sulphate (SS) has an encouraging effect on laying hens production at late period of age (Ali et al, 2007(Ali et al, , 2012(Ali et al, , 2018. Sulfate groups can be identified as antioxidant (Huang et al, 2005).…”