Phosphorus fractions of various feedstuffs and apparent phosphorus availability to channel catfish

Citation
Y. Buyukates et al., Phosphorus fractions of various feedstuffs and apparent phosphorus availability to channel catfish, N AM J AQUA, 62(3), 2000, pp. 184-188
Citations number
23
Categorie Soggetti
Aquatic Sciences
Journal title
NORTH AMERICAN JOURNAL OF AQUACULTURE
ISSN journal
15222055 → ACNP
Volume
62
Issue
3
Year of publication
2000
Pages
184 - 188
Database
ISI
SICI code
1522-2055(200007)62:3<184:PFOVFA>2.0.ZU;2-4
Abstract
This study was conducted to determine different phosphorus fractions in cor n, cottonseed meal, dehulled soybean meal, fish meal analog, meat-bone meal , fish meal from menhaden Brevoortia spp., rice bran, sorghum, wheat, and w heat middlings, and phosphorus availability of these feedstuffs to channel catfish Ictalurus punctatus. Test diets consisting of a 70:30 mixture of re ference diet to test ingredient were used with chromic oxide as the nondige stible marker. The various test diets were fed for 5 d in triplicate to gro ups of channel catfish weighing approximately 150-200 g, and the fecal samp les were obtained by stripping approximately 12 h after feeding. Feed and f ecal samples were analyzed for total phosphorus (TP) and soluble reactive p hosphorus (SRP), from which apparent availability coefficients were calcula ted. Apparent availability of SRP exceeded 92% for all ingredients, except menhaden fish meal (61%) and wheat (44%). Total phosphorus availability fro m animal products was variable: 47% for menhaden fish meal, 54% for meat-bo ne meal, and 92% for fish meal analog. Plant products also had variable TP availability values: 33% for corn, 35% for both sorghum and soybean meal, 5 1% for rice bran, 66% for cottonseed meal, 77% for wheat middlings, and 83% for wheat. These phosphorus availability values obtained for the various f eedstuffs may allow formulation of diets that are better utilized by channe l catfish and reduce phosphorus excretion.