101 research outputs found
Effect of dietary carotenoids on reproducers of Amazon River prawn Macrobrachium amazonicum. Part 1: metabolism,morphometric / zootechnical indexes, body composition and gametes.
The inclusion of natural extracts and solution of synthetic astaxan thin in the Macrobrachium amazonicum diet w ere tested to verify their effect on performance, body indexes and total accumulation of astaxanthin in the reproductive tissues and gametes of this crustacean in comparison with newly captured wild animals. The e xperi ment was randomized in blocks (five treatments with three replicates). Four groups were submitted, during 20 days, to diets in recirculation tanks: control diet (CONT); diet containing natural extract of âburitiâ (CAR); diet with inclusion of natural âuruc umâ extract (BIXN), diet with syntheti c astaxanthin (ASTX) and NATURAL group (not fed with ration). 180 prawns were used, with 60 males (6.08±1.96 g) and 120 females (4.55±1.03 g) distributed in five groups containing four males and eight females each . The re were no significant differences in performance and body indexes. The number of released spermatozoids, live spermatozoids, body and egg pigmentation was higher in BIXN and ASTX treatments. The ASTX treatment was superior to the NATURAL group in the body pigmentation of females and eggs and release of spermatophores by males. These results demonstrate that the use of natural and artificial carotenoid pigments in the diet are beneficial for reproduction of M. amazonicum
Effect of dietary carotenoids on reproducers of Amazon River prawn Macrobrachium amazonicum. Part 2: external coloration, accumulation of astaxanthinin dody tissues and pigment stability in feed.
The color is an important factor to distinguish the commercialized Amazon river prawns. The accumulation of pigments in the body can vary according to the prawn?s diet. In this work, ethanolic extracts of ?buriti? and annatto rich in pigments were obtained and tested comparatively with synthetic astaxanthin in the feeding of adults of Macrobrachium amazonicum, together with a control group without pigments and a newly captured wild group. Levels of body pigments were measured using UV reflective spectroscopy and external staining by colorimetry. Differences were observed in the accumulation of astaxan thin in body tissues, differences in saturation between genders and that annatto extract has greater stability in the feed after water immersion (P˂0.05). Further studies are recommended to verify the ideal dosage of natural pigments in relation to synthetic astaxanthin that benefits the productive development of prawns
Records of Neomorphus squamiger todd, 1925 (cuculiforme: cuculidae) and interaction between n. Squamiger and a flock of Tayassu pecari link, 1795 (artiodactyla: tayassuidae)
O mercado de carne bovina no Brasil: os efeitos da eliminação das barreiras tarifårias e não-tarifårias
Distribution and fluctuations of backswimmers (Notonectidae) in a tropical shallow lake and predation on microcrustaceans
Influence of 2% chlorhexidine on pH, calcium release and setting time of a resinous MTA-based root-end filling material
Economic growth and structural change in a multi-sector and multilateral approach to balance-of-payments constrained growth
Impactos dos acordos comerciais sobre as exportaçÔes de soja, cafĂ©, aves e suĂnos das cooperativas agropecuĂĄrias brasileiras
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