Resumo
This study aimed to produce and nutritionally characterize the ostrich offal meal, and to evaluate its digestible value for Nile tilapia. The relevance of the study lies in the possibility of using by-products from the food industry as alternative food for animals. For this, chemical and microbiological analyses were performed, as well as digestibility trial in the meal produced with ostrich offal for Nile tilapia. The levels found for protein, lipids, gross energy and minerals were 71.08%, 16.54%, 5115 kcal kg-1 and 5.62%, respectively. Microbiological analysis showed absence of Salmonella spp. in the product. The digestibility of protein was 90.41%, and of energy was 77.65%, while the phosphorus availability was 80.18%. Therefore, the ostrich offal meal proved to be a by-product with good nutritional profile and significant digestibility to be used in diets for Nile tilapia.
Resumo
This work was carried out to determine the apparent digestibility coefficients (ADC) of energy and nutrients in supplemented (1000 phytase unit/kg of diet) and non supplemented full-fat soybean meal by Nile tilapia (110.3 ± 20 g). Fish were fed on pelletized diet to apparent satiation. A reference diet with 26.76% crude protein and 3400 kcal digestible energy/kg were utilized. To formulate the test diet, the full-fat soybean meal replaced 30% of the reference diet. Chromic oxide was utilized as an inert indicator. Faeces were collected by modified Guelph system. The ADC of dry matter, gross energy, crude protein, ether extract and total phosphorus were, respectively, 67.64, 73.34, 92.49, 96.12 e 26.14% and 65.96; 75.33; 93.28; 95.73 and 58.82% for full-fat soybean meal without and with phytase supplementation. Results show that full-fat soybean meal is effectively utilized by the Nile tilapia and phytase supplementation improves the availability of total phosphorus
Este trabalho foi realizado para determinar os coeficientes de digestibilidade aparente (CDa) do farelo de soja integral sem e com (1000 unidades de fitase/kg dieta) suplementação de fitase pela tilápia do Nilo (110,3 ± 20 g). Os peixes foram alimentados com dieta peletizada até saciedade aparente. Foi utilizada dieta referência com 26,76% de proteína bruta e 3400 kcal de energia digestível/kg de dieta. Para a elaboração das dietas-teste o farelo de soja integral substituiu 30% da dieta referência. O óxido de crômio foi utilizado como indicador inerte e as fezes foram coletadas pelo sistema de Guelph modificado. A suplementação de fitase resultou em aumento na disponibilidade do fósforo. Os CDa da matéria seca, energia bruta, proteína bruta, extrato etéreo e do fósforo total foram, respectivamente: 67,64%; 73,34%; 92,49%; 96,12% e 26,14% e 65,96%; 75,33%; 93,28%; 95,73% e 58,82%, para o farelo de soja integral sem e com suplementação de fitase. Concluiu-se que o farelo de soja integral é efetivamente utilizado pela tilápia do Nilo e que a utilização de fitase aumenta a disponibilidade do fósforo total
Resumo
This study aimed to produce and nutritionally characterize the ostrich offal meal, and to evaluate its digestible value for Nile tilapia. The relevance of the study lies in the possibility of using by-products from the food industry as alternative food for animals. For this, chemical and microbiological analyses were performed, as well as digestibility trial in the meal produced with ostrich offal for Nile tilapia. The levels found for protein, lipids, gross energy and minerals were 71.08%, 16.54%, 5115 kcal kg-1 and 5.62%, respectively. Microbiological analysis showed absence of Salmonella spp. in the product. The digestibility of protein was 90.41%, and of energy was 77.65%, while the phosphorus availability was 80.18%. Therefore, the ostrich offal meal proved to be a by-product with good nutritional profile and significant digestibility to be used in diets for Nile tilapia.
Resumo
This work was carried out to determine the apparent digestibility coefficients (ADC) of energy and nutrients in supplemented (1000 phytase unit/kg of diet) and non supplemented full-fat soybean meal by Nile tilapia (110.3 ± 20 g). Fish were fed on pelletized diet to apparent satiation. A reference diet with 26.76% crude protein and 3400 kcal digestible energy/kg were utilized. To formulate the test diet, the full-fat soybean meal replaced 30% of the reference diet. Chromic oxide was utilized as an inert indicator. Faeces were collected by modified Guelph system. The ADC of dry matter, gross energy, crude protein, ether extract and total phosphorus were, respectively, 67.64, 73.34, 92.49, 96.12 e 26.14% and 65.96; 75.33; 93.28; 95.73 and 58.82% for full-fat soybean meal without and with phytase supplementation. Results show that full-fat soybean meal is effectively utilized by the Nile tilapia and phytase supplementation improves the availability of total phosphorus
Este trabalho foi realizado para determinar os coeficientes de digestibilidade aparente (CDa) do farelo de soja integral sem e com (1000 unidades de fitase/kg dieta) suplementação de fitase pela tilápia do Nilo (110,3 ± 20 g). Os peixes foram alimentados com dieta peletizada até saciedade aparente. Foi utilizada dieta referência com 26,76% de proteína bruta e 3400 kcal de energia digestível/kg de dieta. Para a elaboração das dietas-teste o farelo de soja integral substituiu 30% da dieta referência. O óxido de crômio foi utilizado como indicador inerte e as fezes foram coletadas pelo sistema de Guelph modificado. A suplementação de fitase resultou em aumento na disponibilidade do fósforo. Os CDa da matéria seca, energia bruta, proteína bruta, extrato etéreo e do fósforo total foram, respectivamente: 67,64%; 73,34%; 92,49%; 96,12% e 26,14% e 65,96%; 75,33%; 93,28%; 95,73% e 58,82%, para o farelo de soja integral sem e com suplementação de fitase. Concluiu-se que o farelo de soja integral é efetivamente utilizado pela tilápia do Nilo e que a utilização de fitase aumenta a disponibilidade do fósforo total