Quality of Eggs from Layers Reared under Alternative and Conventional System

Abstract

The study aimed to compare and assess some of the quality characteristics (morphology, colour of the yolk, total carotenoid content and fatty acid profile) of eggs obtained from hens reared conventionally or in alternative system having access to pasture. Twenty eggs of each rearing system were analysed for the above characteristics. The eggs obtained from the layer reared under the alternative system were significantly heavier than the conventional ones, displayed higher diameters of the albumen and albumen index, as well as increased diameter and weight of the yolk. On the other hand, their shell thickness and Haugh units were lower when compared to the eggs from conventionally reared hens. The colour of the eggs from the alternative system was darker and they had lower values of L* and higher of a* in the yolk, corresponding to the significantly higher content of the total carotenoids in comparison to the eggs obtained from the hens reared conventionally. Furthermore, the eggs from the hens having access to pasture showed clear advantage in the fatty acid profile and the related lipid nutritional indices. In general, the rearing in alternative system reduced considerably the content of C14:0, C16:0, C18:0, C16:1n-7 and C18:1n-9, as well as the saturated (SFA) and monounsaturated fatty acids (MUFA). On the other hand, with the exception of C20:3n-6, the contents of both individual and total polyunsaturated fatty acids (PUFA) were dramatically increased in the eggs from the hens reared in the alternative system. This led to favourably decreased values of n-6/n-3 ratio as well as values of both atherogenic (AI) and thrombogenic (TI) indices but augmented ratio between hypo-and hypercholesterolemic fatty acids.

Production Performance and Egg Quality of Laying Hens as Influenced by Genotype and Rearing System

“…Rearing systems did not cause differences in the egg shape index, which is in agreement with the findings reported by Ahammed et al (2014), Dikmen et al (2017), Sokołowicz et al (2018bSokołowicz et al ( , 2019, Rakonjac et al (2018aRakonjac et al ( , 2018b, and Popova et al (2020). Isa Brown hens produced rounder eggs than New Hampshire (p≤0.01).…”

Development of Chicken Production on Free-Range System

“…Yilmaz Dikmen et al (2017) dalam penelitiannya menggunakan strain Lohmann Brown, kepadatan 8 ekor/m 2 (0,125 m 2 /ekor) dan jenis hijauan terdiri dari campuran rumput kebun (Lolium perenne), semanggi (Trifolium repens), dan alfalfa (Medicago sativa L). Sedangkan Galic et al (2019) menggunakan ayam strain Hysex Brown dengan kepadatan padang pengembalaan 1.000 ekor/ha (10 m 2 /ekor) Selain itu, terkait kepadatan ada juga yang menggunakan 2.500 ekor/ha (4 m 2 /ekor) (Sokołowicz et al 2018;Popova et al 2020); 1.250 ekor/ha (8 m 2 /ekor) (Golden et al 2012;Kucukkoyuncu et al 2017). Produktivitas ayam petelur dengan sistem pemeliharaan berbeda disajikan pada Tabel 2.…”

“…Aktivitas tingkah laku ayam ras petelur yang dipelihara dengan sistem intensif dan free-range (Lay et Perbedaan sistem pemeliharaan dilaporkan ikut memengaruhi kualitas telur. Nilai Haugh Unit (HU) dan warna kuning telur pada free-range lebih tinggi dibandingkan dari sistem cage (Yenice et al 2016;Perić et al 2017;Popova et al 2020;Abo Ghanima et al 2020). Ketebalan kerabang telur dari sistem freerange juga lebih baik dibandingkan dengan sistem cage (Perić et al 2017;Galic et al 2019;Popova et al 2020;Abo Ghanima et al 2020).…”

“…Nilai Haugh Unit (HU) dan warna kuning telur pada free-range lebih tinggi dibandingkan dari sistem cage (Yenice et al 2016;Perić et al 2017;Popova et al 2020;Abo Ghanima et al 2020). Ketebalan kerabang telur dari sistem freerange juga lebih baik dibandingkan dengan sistem cage (Perić et al 2017;Galic et al 2019;Popova et al 2020;Abo Ghanima et al 2020). Hal ini dikarenakan ayam pada sistem free-range memiliki tambahan suplai kalsium dari kemungkinan ayam ikut mengkonsumsi tanah selain hijauan saat merumput, hanya saja di beberapa literatur menyebutkan bahwa telur free-range lebih kotor, retak dan kerusakan lebih tinggi (Golden et al 2012).…”

Sustainability and Quality Aspects of Different Table Egg Production Systems: A Literature Review

“…Experts also point out that there may be significant differences in the feeding used in different types of housing systems, which can greatly affect the quality properties of eggs. The observed differences in experiments [54,55,[63][64][65][66]68,70,72,73,76,81] with different diets could also be traced back to feeding parameters. The research results of [75,82] also support these findings, as they claim that differences/changes in feeding affect egg quality parameters even more directly than housing.…”