Optimization of crude protein in diets for Nile tilapia reared in net pens: performance, hematology, and water quality
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Ciência Rural |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000300651 |
Resumo: | ABSTRACT: Two experiments were conducted to evaluate the effects of reducing dietary crude protein (CP), based on the ideal protein concept for Nile tilapia reared in net pens. The experimental (isocaloric, isocalcium, and isophosphoric) diets were formulated to contain 270, 300, 330, and 360g kg-1 CP. In experiment 1, 4320 Nile tilapia (13.5±0.82g) were used to evaluate the performance and hematological parameters. The experimental design was completely randomized and the fish were distributed in 24 net pens (1.0m3), with four diets, six replicates, and 180 fishes per experimental unit. In experiment 2, 40 Nile tilapia (22.5±0.56g) were used to evaluate the ammonia excretion. Fish were distributed in 40 aquaria (3.0L), with one fish per aquarium (n=10). No protein reduction effect was observed in feed intake and the hematocrit and hemoglobin values. Regarding the statistic models used in the present study, difference was observed between CP values. The optimal level estimated by the quadratic equation first interception with the linear response plateau (LRP) as a response to CP changes in the diet was determined for weight gain (324.3g kg-1) and feed conversion (317.8g kg-1). After reduction in the CP levels, a linear reduction was observed in the ammonia excretion in water. Based on the ideal protein concept for Nile tilapia reared in net pens, reducing the CP levels in the diets is possible, without change in the performance and hematological parameters, and with a reduction in the levels of ammonia excretion in water, since amino acids are supplemented. |
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Optimization of crude protein in diets for Nile tilapia reared in net pens: performance, hematology, and water qualityamino acidsperformancestatistic modelsOreochromis niloticusenvironmental pollutionABSTRACT: Two experiments were conducted to evaluate the effects of reducing dietary crude protein (CP), based on the ideal protein concept for Nile tilapia reared in net pens. The experimental (isocaloric, isocalcium, and isophosphoric) diets were formulated to contain 270, 300, 330, and 360g kg-1 CP. In experiment 1, 4320 Nile tilapia (13.5±0.82g) were used to evaluate the performance and hematological parameters. The experimental design was completely randomized and the fish were distributed in 24 net pens (1.0m3), with four diets, six replicates, and 180 fishes per experimental unit. In experiment 2, 40 Nile tilapia (22.5±0.56g) were used to evaluate the ammonia excretion. Fish were distributed in 40 aquaria (3.0L), with one fish per aquarium (n=10). No protein reduction effect was observed in feed intake and the hematocrit and hemoglobin values. Regarding the statistic models used in the present study, difference was observed between CP values. The optimal level estimated by the quadratic equation first interception with the linear response plateau (LRP) as a response to CP changes in the diet was determined for weight gain (324.3g kg-1) and feed conversion (317.8g kg-1). After reduction in the CP levels, a linear reduction was observed in the ammonia excretion in water. Based on the ideal protein concept for Nile tilapia reared in net pens, reducing the CP levels in the diets is possible, without change in the performance and hematological parameters, and with a reduction in the levels of ammonia excretion in water, since amino acids are supplemented.Universidade Federal de Santa Maria2017-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000300651Ciência Rural v.47 n.3 2017reponame:Ciência Ruralinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSM10.1590/0103-8478cr20160502info:eu-repo/semantics/openAccessPuppo,Débora DelHaese,DouglasGomes,Levy de CarvalhoKill,João LuísBrugnara,Enrique CoelhoBarcellos,JoyceHaddade,Ismail RamalhoTon,Nielton Cezareng2017-02-13T00:00:00ZRevista |
dc.title.none.fl_str_mv |
Optimization of crude protein in diets for Nile tilapia reared in net pens: performance, hematology, and water quality |
title |
Optimization of crude protein in diets for Nile tilapia reared in net pens: performance, hematology, and water quality |
spellingShingle |
Optimization of crude protein in diets for Nile tilapia reared in net pens: performance, hematology, and water quality Puppo,Débora Del amino acids performance statistic models Oreochromis niloticus environmental pollution |
title_short |
Optimization of crude protein in diets for Nile tilapia reared in net pens: performance, hematology, and water quality |
title_full |
Optimization of crude protein in diets for Nile tilapia reared in net pens: performance, hematology, and water quality |
title_fullStr |
Optimization of crude protein in diets for Nile tilapia reared in net pens: performance, hematology, and water quality |
title_full_unstemmed |
Optimization of crude protein in diets for Nile tilapia reared in net pens: performance, hematology, and water quality |
title_sort |
Optimization of crude protein in diets for Nile tilapia reared in net pens: performance, hematology, and water quality |
author |
Puppo,Débora Del |
author_facet |
Puppo,Débora Del Haese,Douglas Gomes,Levy de Carvalho Kill,João Luís Brugnara,Enrique Coelho Barcellos,Joyce Haddade,Ismail Ramalho Ton,Nielton Cezar |
author_role |
author |
author2 |
Haese,Douglas Gomes,Levy de Carvalho Kill,João Luís Brugnara,Enrique Coelho Barcellos,Joyce Haddade,Ismail Ramalho Ton,Nielton Cezar |
author2_role |
author author author author author author author |
dc.contributor.author.fl_str_mv |
Puppo,Débora Del Haese,Douglas Gomes,Levy de Carvalho Kill,João Luís Brugnara,Enrique Coelho Barcellos,Joyce Haddade,Ismail Ramalho Ton,Nielton Cezar |
dc.subject.por.fl_str_mv |
amino acids performance statistic models Oreochromis niloticus environmental pollution |
topic |
amino acids performance statistic models Oreochromis niloticus environmental pollution |
description |
ABSTRACT: Two experiments were conducted to evaluate the effects of reducing dietary crude protein (CP), based on the ideal protein concept for Nile tilapia reared in net pens. The experimental (isocaloric, isocalcium, and isophosphoric) diets were formulated to contain 270, 300, 330, and 360g kg-1 CP. In experiment 1, 4320 Nile tilapia (13.5±0.82g) were used to evaluate the performance and hematological parameters. The experimental design was completely randomized and the fish were distributed in 24 net pens (1.0m3), with four diets, six replicates, and 180 fishes per experimental unit. In experiment 2, 40 Nile tilapia (22.5±0.56g) were used to evaluate the ammonia excretion. Fish were distributed in 40 aquaria (3.0L), with one fish per aquarium (n=10). No protein reduction effect was observed in feed intake and the hematocrit and hemoglobin values. Regarding the statistic models used in the present study, difference was observed between CP values. The optimal level estimated by the quadratic equation first interception with the linear response plateau (LRP) as a response to CP changes in the diet was determined for weight gain (324.3g kg-1) and feed conversion (317.8g kg-1). After reduction in the CP levels, a linear reduction was observed in the ammonia excretion in water. Based on the ideal protein concept for Nile tilapia reared in net pens, reducing the CP levels in the diets is possible, without change in the performance and hematological parameters, and with a reduction in the levels of ammonia excretion in water, since amino acids are supplemented. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000300651 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000300651 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/0103-8478cr20160502 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria |
dc.source.none.fl_str_mv |
Ciência Rural v.47 n.3 2017 reponame:Ciência Rural instname:Universidade Federal de Santa Maria (UFSM) instacron:UFSM |
instname_str |
Universidade Federal de Santa Maria (UFSM) |
instacron_str |
UFSM |
institution |
UFSM |
reponame_str |
Ciência Rural |
collection |
Ciência Rural |
repository.name.fl_str_mv |
|
repository.mail.fl_str_mv |
|
_version_ |
1749140551224000512 |