Scientific Congress Presentation
Carotenoids from shrimp industry waste as a natural dye for the feather coloring of canary birds (Serinus canaria domestica)
2024, 82 (2) p. 0-0
Alexander Atanasoff, Hristo Hristov, Dimitar Yorgov, Ferhat Cagiltay
Abstract
Carotenoids are naturally occurring pigments in plants, algae, fungi, insects, or crustaceans. The krill and prawns contain high levels of some value-added nutrients for the aquaculture industry such as astaxanthin and their function of is to give colour. In birds with ornamental colored plumages like canaries, the carotenoid-pigmented plumage and red hues are exclusively due to the diet. In this regard, we set the aim to study the possibilities of using shrimp industry waste for feather coloring in canary (Serinus canaria domestica). Shrimp (Pandalus borealis) dried waste product was included in the diet of six red lipochrome mosaic canary (Serinus canaria domestica) female (1) for three months in a period of their third molting feathers. The basic diet contained seed mixture (canary seed, sunflower seed without shell, linseed, and rape seed), egg food rearing (Quiko®Bianco), and conditioning food (Quiko®Rusk) with supplementation as an oil suspension of shrimp dried waste product (3%). Ad libitum-fed birds had additional free access to pasta (Legazin® Procria White Morbida). To evaluate the effect on feather colouring of the shrimp industry waste was taken covert feathers from the tail in the region of the glandula uropigial. Diffuse reflectance spectra from the most intensively colored parts of the feathers were measured by a spectrophotometer. The chromaticity coordinates in a CIE xyY colour space was calculated from the measured spectra. The results of the experiment showed the shrimp industry waste increased chromaticity and had no negative effect on the canaries. Based on this, the authors assumed that dried shrimp industry waste could be an alternative to synthetic dyes.