Dietary calcium, phytate and zinc interactions in channel catfish

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“…In the current study, fish fed with the Ca-deficient diet (0.41%) showed poor growth performance and the best growth performance were observed in 1.26% dietary Ca level, which indicated that Ca is necessary for bighead carp in the current breeding water. However, high Ca diet (1.59%) resulted in poor growth performance in bighead carp which indicated high dietary Ca might have adverse effects on the growth of bighead carp, which was similar to the report that higher dietary Ca levels has been shown to adversely affect the growth and survival in channel catfish (Gatlin & Phillips, 1989), rainbow trout (Salmo gairdneri) (Spinelli, Houle, & Wekell, 1983), Chinook salmon (Oncorhynchus tshawytscha) (Richardson, Higgs, Beams, & McBride, 1985), grouper (Ye et al, 2006) and Japanese seabass (Lateolabrax japonicas) (Song et al, 2016 significant effects on whole body ash content, which was similar with these results reported in fingerling scorpion fish (Hossain & Furuichi, 2000c), juvenile jade perch (Scortum barcoo) (Song et al, 2009), Atlantic cod (Kousoulaki et al, 2010) and juvenile grouper (Ye et al, 2006). This finding suggested that dietary Ca supplementation did not change ash content or has no effect on internal deposition.…”

Efeitos da suplementação de fitase sobre a disponibilidade aparente de Mg, Ca, Zn, Cu, Mn e Fe em alimentos vegetais para a tilápia-do-nilo

“…Farelo de soja (Soybean meal) 21,55 ± 3,18b 65,61 ± 6,30a 65,41 ± 5,18a Farelo soja extrusado (Extruded soybean meal) 8,58 ± 3,79b 58,81 ± 6,06a 57,82 ± 6,03a Glúten de milho (Corn gluten) 23,19 ± 3,70b 64,52 ±1,18a 58,14 ± 8,42a Farelo de algodão (Cottonseed meal) 7,80 ± 3,17c 68,18 ± 8,41b 96,92 ± 3,13a Farelo de girassol (Sunflower meal) 45,01 ± 3,55a 42,32 ± 4,10a 48,42 ± 4,98a tados obtidos por Storebakken et al (1998) (Gatlin & Phillips, 1989), os quais estão indisponíveis, em razão da ausência da enzima fitase nos peixes (Vielma, 1998), que é responsável pela hidrólise da molécula de fitato. Assim, a suplementação da enzima fitase pode aumentar a disponibilidade dos minerais presentes nos alimentos, proporcionando melhores respostas de desempenho produtivo e menores quantidades de efluentes.…”

“…Portanto, a suplementação da enzima fitase, que não é produzida pelos peixes, mostrou-se eficiente na disponibilização dos minerais avaliados, que são de grande importância para vários processos metabóli-cos, e na minimização da excreção desses minerais ao meio ambiente, diminuindo o poder poluente dos resí-duos produzidos pela aquicultura. Os resultados neste estudo confirmaram-se que a suplementação da enzima fitase melhorou a disponibilização de fósforo, cálcio, magnésio, manganês, zinco e cobre pela presença dessa enzima, como observado por Spinelli et al (1983), Gatlin & Phillips (1989), Cain & Garling (1995), Rodehutscord & Pfeffer (1995), Robinson et al (1996), Vielma et al (1998), Storebakken et al (1998), Hughes & Soares (1998), Forster et al (1999) e Furuya et al (2001).…”

Dietary rutin has limited synergistic effects on vitamin C nutrition of fingerling channel catfish (Ictalurus punctatus)

“…These higher levels of L-ascorbic acid were selected to evaluate potential use of dietary fortification to improve oxidative stability of channel catfish products in frozen storage. Procedures for diet preparation and storage were as previously described (Gatlin and Phillips 1989). At the end of the feeding trial, diets were extracted and analyzed for vitamin C by using modified procedures of Thenen (1989).…”