Effect of iodine-enriched yeast supplementation of diet on performance of laying hens, egg traits, and egg iodine content

Abstract

The aim of the study was to evaluate the effect of iodine yeast (I-yeast) supplementation on the performance, egg traits, and iodine content of eggs of laying hens. The experiment was conducted as a completely randomized design. A total of 60 laying hens (Hy-Line Brown), 25 wk of age, was divided into 3 groups (4 replicates), and a feeding experiment was conducted for 12 wk. The concentrations and forms of iodine added to the basal diet were as follows: control group, 1 mg of iodine/kg of feed, Ca(IO(3))(2)•H(2)O; experimental groups E1 and E2, 1 and 2 mg of iodine per kilogram of feed, I-yeast, respectively. The iodine yeast did not significantly affect BW gain. Lower level of hen day egg production for groups E1 and E2 was not confirmed statistically; however, it was probably the consequence of low replication. Feed intake was the lowest in the E1 group and feed conversion rate was the highest in the E2 group. Furthermore, the egg and albumen weight was the highest in the group supplemented with 2 mg/kg of iodine from I-yeast (P < 0.05). The concentration of iodine in the egg yolk from groups E1 and E2 was respectively about 80 and 90% higher, compared with the control group. Eggshells from the group fed with 2 mg/kg of I-yeast contained almost 3 times more iodine than eggshells from the control group. The results suggest that iodine yeast supplementation in the diet of laying hens is an effective method for increasing iodine concentration in eggs and thus could contribute to elimination of iodine deficiency disorders in humans consuming iodine-enriched eggs.

The effects of dietary calcium iodate on productive performance, egg quality and iodine accumulation in eggs of laying hens

“…In agreement with the present study, some researchers reported that I supplementation to layer hens diets had no significant effects on egg production, egg mass production, egg weight, feed intake, FCR, un‐normal eggs and body weight changes (Lichovnikova & Zeman, ; Opaliński et al., ; Yalçin, Kahraman, Yalcin, Yalcin, & Dedeoglu, ).…”

“…Opaliński et al. () used Hy‐Line Brown laying hen during a 12‐week period and reported that dietary I supplementation significantly improves the egg yolk colour ( p = .002). Yalçin et al.…”

Effects of Different Supplements Inclusion of the Enriched Diet on Productive Performance and Egg Structure

“…In this study, a lower weight of eggshell (7.00 g) in iodine eggs was recorded in comparison with the control group (p<0.05). This response was similar with the findings of the study conducted by Lichovnikova et al (2003) with long-term effects using higher amount of iodine, but in opposition to findings reported by Lichovnikova and Zeman (2004) and Opalinski et al (2012).…”

“…Enrichment of egg content with some supplements was performed with modification of the feed composition (Gjorgovska and Filev, 2011). The most common enriched eggs are with omega Opalinski et al, 2012). A lot of studies presented the content of the supplementary element in the eggs enriched as functional food, but there is a lack of information about the egg structure parameters and productive performance.…”

Feed Additives Produced on the Basis of Organic Forms of Micronutrients as a Means of Biofortification of Food of Animal Origin

“…Opaliński et al [20] showed that the use of yeast enriched with iodine in laying hens significantly increases the level of this element in the egg. In these studies, the birds were divided into three groups.…”