Nutritional characteristics and quality of eggs from laying hens fed on a diet supplemented with chestnut tannin extract (Castanea sativaMiller)

Abstract

1. The trial was performed with 80 laying hens belonging to two Tuscan autochthonous breeds: 40 birds of the Mugellese (MU) breed and 40 of the White Leghorn (WL) breed. 2. The animals were allotted to 4 groups of individually caged 20 hens each: two groups were fed on a commercial diet and worked as the control groups (MUC and WLC); the other two groups received the same diet, integrated with 2 g of chestnut tannin (CT) extract per kg of diet (MUT and WLT). 3. A sample of 70 eggs were randomly collected and analysed for cholesterol content, fatty acid (FA) profile, weight, thickness of shell and colour of yolk. 4. Physical parameters, including yolk colour, and indices of egg quality were not affected by the treatments. 5. The concentration of unsaturated FAs increased, whereas cholesterol was significantly decreased: −17% in WLT and −9% in MUT. Dietary supplementation with CT extract resulted in a modification of lipid composition, towards a more healthy quality of eggs.

Effect of Breed and Diet Type on the Freshness and Quality of the Eggs: A Comparison between Mos (Indigenous Galician Breed) and Isa Brown Hens

“…The eggs from Isa Brown hens had a higher moisture content (77.40%), while those eggs from Mos hens showed higher lipid (9.53%), protein (12.31%) and ash (1.10%) contents. In agreement with the result of the present study, Minieri et al [38] showed that eggs from Mugellese breed contained higher protein, lipid and ash content in comparison with White Leghorn ones. In the same line, Millet et al [39] also found differences in the eggs' composition, comparing Lohmann Selected Leghorn with Isa Brown.…”

Performance of Slow-Growing Male Muscovy Ducks Exposed to Different Dietary Levels of Quebracho Tannin

“…In contrast, it has been shown that depending on the bird’s age, health and physiological status, beneficial effects might be obtained by combining a specific tannin group in the diet. In this regard, a positive influence on chicken growth performance [ 26 ], improved final body weight and feed efficiency in broilers [ 27 ], reduced cholesterol level in Leghorn hens eggs [ 28 ], potential anticoccidial agent in broilers [ 19 ] and anthelmintic activity in pheasants [ 20 ] were reported in the reference literature.…”

Nilai Haugh Unit (HU), Indeks Kuning Telur (IKT) dan Ph Telur Itik Pengging Setelah Pemberian Tepung Daun Kelor (Moringa oleifera Lam.)

“…Tanin merupakan suatu zat anti-nutrisi. Penambahan tanin pada pakan unggas dapat memberikan efek anti-nutrisi yang menyebabkan penurunan kecernaan bahan organik dan dapat mengakibatkan menurunnya pertumbuhan atau produksi telur (Minieri et al, 2016). Hal tersebut sejalan dengan penelitian yang dilakukan oleh Kwari et al (2011), bahwa pemberian pakan yang mengandung tanin menurunkan produksi telur, berat telur, dan kualitas kerabang telur jika dibandingkan dengan perlakuan kontrol.…”