Levels of available phosphorus and calcium for broilers from 8 to 35 days of age fed rations containing phytase
Two experiments using Cobb broiler chicks from 8 to 35 days of age were carried out to evaluate the effect of reducing levels of calcium and available phosphorus in diets supplemented with 500 ftu phytase/kg on the performance of the birds, the content of ashes in the tibia, the metabolizable energy of the diet, and the metabolizability of the dry matter and crude protein. It was used 1,404 broiler chicks in the experiment 1 to evaluate feed intake, weight gain, food conversion and percentage of the ashes in the tibia. In the experiment 2, simultaneously carried out with experiment 1, a total of 390 birds were transferred to a metabolism room to determine the metabolizable energy and metabolizability of the dry matter and crude protein. It was used in the two experiments, a complete random design in a 3 × 4 + 1 factorial scheme with three levels of available phosphorus (0.375; 0.325; and 0.275%) and four levels of calcium (0.85; 0.75; 0.65 and 0.55%) in the diets, supplemented with phytase. It was also used a control diet without phytase, based on corn and soybean bran, formulated with 0.425% of available phosphorus and 0.85% of calcium. In the experiment 1, the reduction of levels of calcium and phosphorus did not cause a significant difference on the performance and percentage of bone ashes. The levels of calcium and available phosphorus used in the experiment 2 can be reduced down to 0.65 and 0.325%, respectively, because the effects are similar to those obtained with the currently suggested levels.
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Sociedade Brasileira de Zootecnia
2010
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oai:scielo:S1516-359820100006000112010-08-31Levels of available phosphorus and calcium for broilers from 8 to 35 days of age fed rations containing phytaseCardoso Júnior,AdimarRodrigues,Paulo BorgesBertechini,Antônio GilbertoFreitas,Rilke Tadeu Fonseca deLima,Renato Ribeiro deLima,Gustavo Freire Resende enzyme minerals nutritional requirement Two experiments using Cobb broiler chicks from 8 to 35 days of age were carried out to evaluate the effect of reducing levels of calcium and available phosphorus in diets supplemented with 500 ftu phytase/kg on the performance of the birds, the content of ashes in the tibia, the metabolizable energy of the diet, and the metabolizability of the dry matter and crude protein. It was used 1,404 broiler chicks in the experiment 1 to evaluate feed intake, weight gain, food conversion and percentage of the ashes in the tibia. In the experiment 2, simultaneously carried out with experiment 1, a total of 390 birds were transferred to a metabolism room to determine the metabolizable energy and metabolizability of the dry matter and crude protein. It was used in the two experiments, a complete random design in a 3 × 4 + 1 factorial scheme with three levels of available phosphorus (0.375; 0.325; and 0.275%) and four levels of calcium (0.85; 0.75; 0.65 and 0.55%) in the diets, supplemented with phytase. It was also used a control diet without phytase, based on corn and soybean bran, formulated with 0.425% of available phosphorus and 0.85% of calcium. In the experiment 1, the reduction of levels of calcium and phosphorus did not cause a significant difference on the performance and percentage of bone ashes. The levels of calcium and available phosphorus used in the experiment 2 can be reduced down to 0.65 and 0.325%, respectively, because the effects are similar to those obtained with the currently suggested levels.info:eu-repo/semantics/openAccessSociedade Brasileira de ZootecniaRevista Brasileira de Zootecnia v.39 n.6 20102010-06-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000600011en10.1590/S1516-35982010000600011 |
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Cardoso Júnior,Adimar Rodrigues,Paulo Borges Bertechini,Antônio Gilberto Freitas,Rilke Tadeu Fonseca de Lima,Renato Ribeiro de Lima,Gustavo Freire Resende |
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Cardoso Júnior,Adimar Rodrigues,Paulo Borges Bertechini,Antônio Gilberto Freitas,Rilke Tadeu Fonseca de Lima,Renato Ribeiro de Lima,Gustavo Freire Resende Levels of available phosphorus and calcium for broilers from 8 to 35 days of age fed rations containing phytase |
author_facet |
Cardoso Júnior,Adimar Rodrigues,Paulo Borges Bertechini,Antônio Gilberto Freitas,Rilke Tadeu Fonseca de Lima,Renato Ribeiro de Lima,Gustavo Freire Resende |
author_sort |
Cardoso Júnior,Adimar |
title |
Levels of available phosphorus and calcium for broilers from 8 to 35 days of age fed rations containing phytase |
title_short |
Levels of available phosphorus and calcium for broilers from 8 to 35 days of age fed rations containing phytase |
title_full |
Levels of available phosphorus and calcium for broilers from 8 to 35 days of age fed rations containing phytase |
title_fullStr |
Levels of available phosphorus and calcium for broilers from 8 to 35 days of age fed rations containing phytase |
title_full_unstemmed |
Levels of available phosphorus and calcium for broilers from 8 to 35 days of age fed rations containing phytase |
title_sort |
levels of available phosphorus and calcium for broilers from 8 to 35 days of age fed rations containing phytase |
description |
Two experiments using Cobb broiler chicks from 8 to 35 days of age were carried out to evaluate the effect of reducing levels of calcium and available phosphorus in diets supplemented with 500 ftu phytase/kg on the performance of the birds, the content of ashes in the tibia, the metabolizable energy of the diet, and the metabolizability of the dry matter and crude protein. It was used 1,404 broiler chicks in the experiment 1 to evaluate feed intake, weight gain, food conversion and percentage of the ashes in the tibia. In the experiment 2, simultaneously carried out with experiment 1, a total of 390 birds were transferred to a metabolism room to determine the metabolizable energy and metabolizability of the dry matter and crude protein. It was used in the two experiments, a complete random design in a 3 × 4 + 1 factorial scheme with three levels of available phosphorus (0.375; 0.325; and 0.275%) and four levels of calcium (0.85; 0.75; 0.65 and 0.55%) in the diets, supplemented with phytase. It was also used a control diet without phytase, based on corn and soybean bran, formulated with 0.425% of available phosphorus and 0.85% of calcium. In the experiment 1, the reduction of levels of calcium and phosphorus did not cause a significant difference on the performance and percentage of bone ashes. The levels of calcium and available phosphorus used in the experiment 2 can be reduced down to 0.65 and 0.325%, respectively, because the effects are similar to those obtained with the currently suggested levels. |
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Sociedade Brasileira de Zootecnia |
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2010 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000600011 |
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