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Descripción
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| An experiment was conducted to determine the influence of length of storage on the values used by the industry to estimate protein quality of soybean meal (SBM): KOH solubility (KOHsol.), protein dispersibility index (PDI), urease activity (UA), and trypsin inhibitor activity (TIA). The KOHsol. and PDI have been found useful in estimating the degree of toasting and damage in SBM. Meals with KOHsol. values between 80 and 88%, PDI values between 20% and 35%, and UA values between 0.02 and 0.20 mg/g are considered of acceptable quality. For TIA a value of less than 2.5 mg/g (< 4-5 mg TI/g) is considered best. However, protein solubility changes with the methodology used and thus, the variability among- and inter-laboratory is high. Length and environmental conditions during storage might influence protein solubility and thus KOHsol. and PDI values. Seven samples (500 g) of Argentine SBM were collected during June 2007. Samples were analyzed at arrival of the vessels to port (Pontevedra, Spain) and after 24, 48, and 80 wk of storage (12 ± 2ºC and 70 ± 3% humidity). Also, meals were analyzed for TIA following method 14902:2001 (UNE-EN-ISO, 2002) used in Europe and method 71-10 (AACC, 1973) used in USA. All the SBM samples tested were regular meals with a CP content ranging from 49.0 to 55.0% DM. Length of storage did not affect KOHsol., UA or TIA values. However, PDI values decreased with time (20.2, 16.5, 14.9, and 12.7% for 0, 24, 48, and 80 wk, respectively; P < 0.01). No differences were observed between the 2 methods used to measure TIA (2.54, 2.40, 2.49, and 2.59 mg/g for UNE-EN-ISO and 2.40, 2.44, 2.33, and 2.33 mg/g for AACC at 0, 24, 48, and 80 wk, respectively; P > 0.10). The results indicate that the correlation between TIA and PDI values varied with length of the storage. Therefore, care should be taken when determining PDI values to evaluate the protein quality of SBM in samples that have been stored for prolonged periods of time. | |
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Internacional
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Si |
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Nombre congreso
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98th Poultry Science Association Annual Meeting |
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Tipo de participación
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960 |
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Lugar del congreso
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Raleigh, North Carolina |
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Revisores
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Si |
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ISBN o ISSN
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0032-5791 |
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DOI
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Fecha inicio congreso
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20/07/2009 |
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Fecha fin congreso
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23/07/2009 |
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Desde la página
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1 |
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Hasta la página
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232 |
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Título de las actas
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Poultry Science, 88 (1): 1-232 |