APRECIATION OF SOME MORPHOLOGICAL AND PHYSICAL QUALITY INDICATORS FOR EGGS OBTAINED FROM LAYING HENS REARED IN GROWING SYSTEMS AGGRED BY EUROPEAN UNION
Specialists in aviculture focused on elaboration and implementation in practice of some alternative systems for rearing of laying hens, which must fulfil their biological necessities, but at the same time to assure high levels of production. From alternative systems, improved cage batteries had many positive appreciations; another exploitation solution is the one on a permanent layer, in shelters with controlled environment, but the most appreciated technological variant is rearing in open shelters with exterior paddocks (free range). By the current paper we aimed to analyse the quality of eggs gathered form hens reared in different growing systems, through four parameters (incidence of eggs with morphological anomalies, weight, thickness of mineral shell and breaking up resistance of mineral shell). The highest rate of eggs with broken shell was obtained at batch L3 (0.67%), followed by L2 (0.64%) and L1 (0.52%). The rate of eggs with a bad formed shell differed function of growing system, being 0.42 for L1, 0.4 for L2 and 0.36 at L3. The biggest weight of eggs was recorded at batch L3, with a mean of 64.289±0.247g; eggs gathered from L2 had a mean weight of 63.676±0.287g and 62.677±0.347g the ones from L1. Thickness of mineral shell at batch L3 had a mean value of 0.424±0.002mm, at the ones from L2 was 0.394±0.001mm and at the ones gathered from laying hens housed in batteries was 0.374±0.002mm. Breaking up resistance of mineral shell (kgf/cm2) was in a close correlation with its thickness so the highest mean value was obtained at batch L3, 0.335±0.001, followed by L2 (0.328±0.001), respectively L1 (0.328±0.001). The presented results are part of an ample study for enlargement the knowledge area regarding quality of eggs destined for human consumption.
Key words: eggs' quality, rearing systems, morphological anomalies, eggs weight, breaking up resistance