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Temperatures below the comfort zone (sub-optimal) decrease the metabolic activity of the organism, which can cause losses in fish growth and development. Improving the availability of nutrients can favor the productive indexes. The objective of this work was to evaluate the enzyme blend supplementation (200 ppm of phytase, 400 ppm of protease and 200 ppm of alpha-amylase) in diets with nutritional reduction on performance and physical and chemical composition of tilapia kept at sub-temperature (23.15 ± 0.2 ° C). The trial was conducted at the UFPB / CCHSA for a period of 60 days. A total of 260 male Nile tilapia fingerlings, sexually induced, were distributed in a completely randomized design with four treatments and five replicates. The control diet DCEE (control diet with enzyme blend), DV1EE (reduction of 1.32% of PB and ED + enzyme blend) and DV2EE (reduction of 2.64% of PB and ED + enzyme blend). The parameters of performance and physicochemical composition of the carcass were evaluated. The enzymatic supplementation was efficient in providing nutrients supplying a deficit of up to 2.64% of energy and protein in the diet of tilapia submitted to sub-optimal temperatures. [ABSTRACT FROM AUTHOR]

The ornamental fish market requires an animal with adequate size in a short period of production, to meet the nutritional requirements strategies should be implemented, such as the use of exogenous enzymes in diets. The research was conducted in order to evaluate the influence of enzyme supplementation on performance ornamental guppy fish. Two diets were tested, one supplemented with exogenous enzymes protease, phytase and alpha amylase. Were evaluated: body weight, weight gain, feed conversion, length complete and standard, gain in total and standard length, height, width, specific growth rate; Specific development rate and Fulton condition factor. Enzyme supplementation influenced positively the growth and development of guppys ornamental fish. [ABSTRACT FROM AUTHOR]

The aim of this work was to determine growth curves and body nutrients deposition by using Gompertz equation, and to estimate protein requirement in light and semi heavy hen pullets. In total, 1,500 hen pullets were distributed at random into 30 repetitions of 25 birds each. Experimental period was divided into three steps (1st to 4th, 5th to 11th and 12th to 16th weeks of age). Rations were formulated based on corn and soybean meal and offered ad libitum. Birds were weighed weekly. Two birds per repetition were used to determine chemical body composition and data were used to obtain Gompertz model parameters. Allometric ratios were used to describe changes in the body composition in protein, lipid, mineral matter and water in the eviscerated and featherless body. Weight-age data of Dekalb White and Bovans Goldline pullets were well described by Gompertz function. Allometric coefficients of fat, water and mineral matter in function of the protein body weight were, respectively: 0.114, 0.811 and 0.930 for Dekalb line and 1.160, 0.429 and 0.189 for Bovans line. There are differences between lines for growth rates and body nutrients and feathers deposition, with Dekalb line being the most precocious. Total protein requirements (maintenance and growth) for pullets from 1st to 4th, 5th to 11th and 12th to 16th weeks of age were 4.41; 9.814 and 12.612 g·d-1 for Dekalb White and 4.82; 8.859 and 7.673 g·d-1 for Bovans Goldline, respectively. [ABSTRACT FROM AUTHOR]