Abstract
Apparent digestibility coefficients (ADC) for dry matter, energy, crude protein (CP), and amino acids (AA) were evaluated for 4 feedstuffs used to feed juvenile white shrimp (Penaeus vannamei): fish meal (73.5% CP), potato protein concentrate (89.3% CP), brewer’s yeast (42.5% CP), and crustacean meal (47.2% CP). Experimental diets included 30% of the test ingredient and 69% of a commercial diet supplemented with 1% chromium oxide as inert marker. Amino acid contents in the ingredients, experimental diets, leached diets, and feces were analyzed by high-performance liquid chromatography. Nutrient loss in water was highest in the fishmeal diet (25%). The AA with the highest losses in water were lysine, methionine, and arginine (25%, 23%, and 21%, respectively). The ADC for dry matter oscillated between 79.2% and 90.6%, for CP between 78.1% and 91.8%, and for AA between 75.4% and 96.6%. In all cases the lower limit corresponded to the meal with potato protein concentrate and the upper limit to the crustacean meal. The ADC for energy fluctuated between 89.1% and 95.2%, with the lower limit for the crustacean meal and the upper limit for the meal with potato protein concentrate.
Highlights
Amino acid contents in the ingredients, experimental diets, leached diets, and feces were analyzed by high-performance liquid chromatography
The aim of the present study is to evaluate the apparent digestibility efficiency of dry matter, energy, proteins, and amino acids in a reference diet and in 4 feedstuffs used in shrimp feed: Pilchard meal (Sardinops sagax), potato protein concentrate (Solanum tuberosum), brewer’s yeast (Saccharomyces cerevisiae), and crustacean meal (Heterocarpus reedi)
Goytortúa-Bores et al (2006) analyzed the crustacean meal used to feed Pacific white shrimp and found that Apparent digestibility coefficients (ADC) values for crude protein were lower than the value observed in the present study (82–84% vs 92.8%)
Summary
Ciencias Marinas, Vol 45, No 3, 2019 feeds. The aim of the present study is to evaluate the apparent digestibility efficiency of dry matter, energy, proteins, and amino acids in a reference diet (commercial diet) and in 4 feedstuffs used in shrimp feed: Pilchard meal (Sardinops sagax), potato protein concentrate (Solanum tuberosum), brewer’s yeast (Saccharomyces cerevisiae), and crustacean meal (Heterocarpus reedi). The AA proximate composition and AA contents found for the different feedstuffs were similar to what has been previously reported (NRC 1983, Novus 1996, Hess et al. La composición bromatológica de los ingredientes, las dietas y las heces fue determinada utilizando los siguientes métodos: para la humedad, el método 930.15; para la proteína cruda, el método 990.03; para las cenizas, el método 942.05; y para la fibra, el método 962.09B (AOAC International 1997). Los coeficientes de digestibilidad aparente (CDA) de materia seca, proteína y aminoácidos de las dietas fueron calculados usando la siguiente ecuación: %CDAdieta = 100 – [100(Cdieta/Ndieta) × (Nheces/Checes)], donde C y N son, respectivamente, las concentraciones del óxido de cromo y del nutriente en dietas o heces (base seca). Los CDA de las dietas y de los ingredientes fueron ajustados considerando el porcentaje de nutrientes perdidos en el agua por efecto de lixiviación (Villarreal-Cavazos et al 2014). El CDA para la suma de AA varió entre 75% y
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