Apparent digestibility of amino acids in feedstuffs used in diets for the Pacific white shrimp, Penaeus vannamei

Abstract

espanolLos coeficientes de digestibilidad aparente (CDA) de materia seca, energia, proteina cruda (PC) y aminoacidos (AA) fueron evaluados en 4 ingredientes utilizados para alimentar juveniles de camaron blanco (Penaeus vannamei): harina de pescado (73.5% PC), concentrado proteico de papa (89.3% PC), levadura de cerveza (42.5% PC) y harina de crustaceo (47.2% PC). Las dietas experimentales incluyeron 30% del ingrediente prueba y 69% de una dieta comercial suplementada con 1% de oxido de cromo como marcador inerte. El contenido de aminoacidos en los ingredientes, las dietas formuladas, las dietas lixiviadas y las heces fue analizado por cromatografia liquida de alta resolucion. La mayor perdida de nutrientes en el agua se presento con la dieta de harina de pescado (25%). Los AA con mayor perdida en el agua fueron la lisina, la metionina y la arginina (25%, 23% y 21%, respectivamente). Los CDA para la materia seca oscilaron entre el 79.2% y el 90.6%, para la PC entre el 78.1% y el 91.8%, y para los AA entre el 75.4% y el 96.6%. En todos los casos el limite inferior correspondio al concentrado proteico de papa y el superior a la harina de crustaceo. El CDA para la energia fluctuo entre el 89.1% y el 95.2%, con el limite inferior para la harina de crustaceo y el superior para el concentrado proteico de papa. EnglishApparent 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.