Egg quality during storage and deposition of minerals in eggs from quails fed diets supplemented with organic selenium, zinc and manganese

Abstract

-Three experiments with Japanese laying quails were performed aiming to assess the effect of supplementation with minerals in organic form on the egg quality during storage and the deposition of minerals in eggs. The assessments of each experiment were related to one mineral, thus, experiment 1 assessed the supplementation with selenium in 0.35-, 0.70-and 1.05-mg/kg levels of feed; experiment 2, the supplementation with zinc in 50-, 100-and 150-mg/kg levels of feed; and experiment 3, the supplementation of manganese with 60-; 120-and 180-mg/kg levels of feed. All diets were evaluated compared with a control diet without mineral supplementation. Birds were distributed in a completely randomized experimental design, with eight birds per plot and six replicates per treatment. Fifty-five days after the beginning of diets, the yolks of three eggs from each plot were collected for selenium, zinc and manganese quantification, whereas the albumens of three eggs from each parcel were collected for analysis of selenium concentration. Eggs were collected at the last days of the experimental period from each experiment, to be stored at room temperature (28±2 °C) and refrigeration (4 °C) during different periods (0, 10, 20 and 30 days), except for experiment 3, in which eggs were stored at 0, 10 and 20 days. Percentages of albumen and yolk, yolk index, Haugh unit and moisture loss of eggs were evaluated. The supplementation with selenium is able to maintain the egg yolk index unchanged over the storage periods; however, supplementation with zinc and manganese is not effective to keep the quality of stored eggs. Supplementation with selenium and manganese is effective to increase the concentration of these minerals at 328.66% in the albumen and at 74.47% in the yolk, respectively. The different levels of zinc do not change the egg composition.

Effect of <i>Moringa oleifera</i> (Lam.) pods as feed additive on egg antioxidants, chemical composition and performance of commercial layers

“…Similar findings were reported in previous studies (Nkukwana et al, 2016;Qwele et al, 2013). Similar results were reported in the estimation of calcium in tibia bone and ash content with M. oleifera supplementation (Nkukwana et al, 2014b;Gravena et al, 2011). Feed supplemented with MPM significantly affected serum biochemistry (P ≤0.05).…”

“…Selenium and methionine have a close relationship in metabolism. Birds supplemented only with methionine (3.2, 4.0, and 5.4g/kg) without selenium showed 0.48, 0.63, and 0.62 µg/g of deposited selenium in egg yolk, whereas this deposition was increased with an increment of selenium (Wang et al, 2010;Gravena et al, 2011). An organic form of selenium can easily enrich eggs, as was shown in a study conducted by Bennett and Cheng, (2010), in which they used sodium selenite (0.3 µg Se/g of feed) along with selenium yeast SSAF-600 ® (Diamond V Mills, Cedar Rapids, IA, USA), an organic source with the concentrations 1.0, 2.4, and 5.1 µg Se /g of diet.…”

Effects of feed supplementation with manganese from its different sources on performance and egg parameters of laying hens

“…The discrepancies in relative bioavailability between various organic Mn sources could be explained by different chemical characteristics and chelation strength of commercial organic Mn feed additives (Li et al, 2004). Gravena et al (2011) observed an increase in the Mn content of egg yolk from quails supplemented with 60, 120, and 180 mg Mn/kg feed from an organic source. According to Mabe et al (2003), feed supplementation with Mn levels at 30 or 60 mg/kg from its inorganic (MnO) and organic (Mn amino acid complex) sources resulted in higher deposition of this trace element in the yolk of eggs from hens receiving greater amounts of Mn in their diet, regardless of its source.…”

Different trace mineral sources and recommendations in the performance and quality of eggs from Dekalb White layers

“…According to Gravena et al (2011), organic selenium, in the form of selenium-methionine, influences egg quality, since it participates in the synthesis of proteins deposited in the albumen.…”