Amino Acid Reference Values for Selected Feed stuffs Used in the Nigerian Poultry Industry.
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The main objective of this study was t o establish reference protein composition values for selected local feedstuffs such as dry brewers spent grain (DBSG), cassava meal (CAM), palm kernel cake (PKC) and groundnut cake (GNC) for the Nigerian feed industry by determining amino acids profiles an d amino acids compositional quality scores. The selected local feedstuffs were each sourced from five locations from northern and southern parts of Nigeria such that there were five samples for each raw material and 20 samples in all. The samples were anal ysed at Evonik Industry L aboratory, Germany . Results were generated on dry matter (DM), c rude protein (CP) standardized to a dry matter content of 88%, CP as is, t otal amino acids (Taa) without NH ₃ , and NH ₃ content. Total amino acids Essential amino acids, non - essential amino acids , a mino acid scores such as qualitative, quantitative and chemical scores were calculated and values subjected to descrip tive statistics such as mean, standard deviation and coefficient of variation across samples values from different locations. This study showed that all the sampled local feedstuffs were high in dry matter content, with values ranging from 89.304 ± 0.857% recorded for CAM to 93.006 ± 0.456% recorded for PKC. However, the coefficient of DM variation was less than 1.00%. CP content of the DBSG, CAM , PKC and GNC sampled (as is), ranged from 0.988 ± 0.230% for CAM to 44.430 ± 6.600% for GNC, while the CV between the different samples ranged from 4.518% record ed for PKC to 23.279% recorded for CAM. The Taa ranged from 0.837 ± 0.182% recorded for CAM to 40.025 ±5.831% recorded for GNC , with high CVs of 21.744% for CAM and 14.568% recorded for GNC values , indicating wide variations in Taa of samples from differen t locations. Methionine content of the feedstuff ranged from the 0.014 ± 0.005% recorded for CAM to the 0.441 ± 0.039% recorded for DBSG, with CVs of 35.714 % and 11.004 for CAM and GNC respectively. Lysin values ranged from 0.045 ± 0.006% recorded for CAM to 1.43 9 ± 0.162% recorded for GNC, with CVs across five samples of each material being generally higher than 10% except for PKC. Again, threonine concentrations