Effect of dietary lysine and organnic chromium on performance, egg quality, incubation properties, metabolic profile and defence system of eggs, chicks and breeder laying hens reared under different ambient temperature

This study was carried out to determine the effects of dietary supplemental lysine and chromium-picolinate to breeder laying hen diets on performance, egg quality, incubation properties, serum metabolic profile, oxidative status of egg, chicks and breeder laying hens. The breeder laying hens reared under normal and high temperature. 35 weeks old Barred Rock-1 female (120) and Rhode Rock-1 male (16) breeders used in the experiment. Two temperature regimes were thermoneutral (25 ± 2◦C for 24 h) or recycling hot (35 ± 2◦C for 8 h and 25 ± 2◦C for 16 h). A 2x2x2 factorial arrangement was employed with two levels of supplemental lysine (0 and 0.085% plus 20%) and two levels of supplemental chromium picolinate (0 or 400 ppb) under thermoneutral or high temperature regimes. In the study, effects of the chromium-picolinate and lysine on laying performance, egg production, egg quality, egg yolk biochemistry, hatching performance, blood parameters or antioxidative capacity of yolk and chicks were evaluated in breeder laying hens exposed to normal and high ambient temperature. Results showed that body weight gain, egg production, feed intake, feed conversion ratio, egg mass, egg yolk color, early embryo mortality rate, chick weight, TAS concentration in chickens, egg TAS and cholesterol concentration in yolk and chicken TAS, TOS and OSI values were statistically affected. The findings obtained present study suggests that the lysine and chromium-picolinate supplementation positively affected some performance and egg quality parameters, hatchability properties, egg cholesterol levels, antioxidative capacity of chicks and breeder laying hens exposed to high ambient temperature.