Protein to energy ratios in goldfish (Carassius auratus) diets
| Autor: | Cristielle Nunes Souto, Marcos Vinicius Antunes de Lemos, Graciela Pessoa Martins, Janaína Gomes Araújo, Karina Ludovico de Almeida Martinez Lopes, Igo Gomes Guimarães |
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| Jazyk: | English<br />Spanish; Castilian<br />Portuguese |
| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Ciência e Agrotecnologia, Vol 37, Iss 6, Pp 550-558 (2013) |
| Druh dokumentu: | article |
| ISSN: | 1981-1829 1413-7054 |
| DOI: | 10.1590/S1413-70542013000600008 |
| Popis: | The optimal dietary digestible protein to energy ratio is critical for the success of fish farming. Considering that it provides the proper development of the animals, this study was undertaken to evaluate the effects of different dietary digestible protein to energy ratio in diets for goldfish fingerlings. Diets were formulated to contain 28.0, 35.0, 42.0 and 49.0% DP and 3,600 and 3,200 kcal/kg. The growth parameters evaluated were daily weight gain (DWG), feed intake (FI), feed conversion ratio (FCR), protein efficiency ratio (PER), protein productive value (PPV) and energy retention ratio (ERR) and specific growth rate (SGR). Regardless FI, all the parameters were affected by protein and energy levels and interaction between both factors was observed. The second-order polynomial equation best fitted to the DWG, SGR, FCR, PER and ERR with estimated requirement values of 38.81, 38.85, 41.05, 41.80 and 39.39% DP, respectively, at the 3,200 kcal/kg. A second-order polynomial model was significant only for the ERR data at the 3,600 kcal/kg with an estimated requirement value of 36.45% DP. Generally, fish fed diets containing 3,200 kcal/kg had better growth performance than fish fed 3,600 kcal/kg (P |
| Databáze: | Directory of Open Access Journals |
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