基于主成分分析法建立鸡日龄的评估模型

Assessment model of chicken age using principal component analysis in chicken tibia

利用物性测试仪测定100日龄、120日龄和150日龄鸡胫骨三点弯曲试验,获得最大载荷(Z1)、最大挠度(Z2)、最大应力(Z3)、最大应变(Z4)、刚性系数(Z5)、结构能量(Z6)、弹性模量(Z7)、材料能量(Z8)8个力学参数。通过对8个力学参数的相关矩阵分析和主成分分析,建立了鸡骨力学特性主成分综合评价模(F=0.3206Z1*+0.3257Z2*+0.3150Z3*+0.3563Z4*+0.2349Z5*+0.2931Z6*+0.1836Z7*+0.3534Z8*)。结果表明,选取前2个特征值作为2个主成分,累计贡献率达到83.587%,基本上反应了原所有力学参数所包含的全部信息。对100日龄、120日龄和150日龄鸡胫骨得分单因素分析,结果显示150日龄的鸡胫骨主成分综合得分最高,其次为120日龄的鸡胫骨,得分最低的是100日龄的鸡胫骨,结果与预期完全吻合。实验为通过物性测试仪测量不同日龄的鸡胫骨,进而判断鸡肉的食用品质奠定了理论依据。

The present work aimed to study the assessment model of chicken bone with mechanical characteristics and compare chicken tibia of different age. Three point bending test of 100 days＇ chicken tibia, 120 days＇ chicken tibia and 150 days＇ chicken tibia was conducted by texture analyzer to get texture indexes, including maximum load, maximum distance, maximum stress, maximum strain, stiffness coefficient, energy absorption of structure, elastic modules and energy absorption of material. The correlation matrix and the principal component analysis were carried out for the texture indexes, and the assessment model was established. The result showed that the first two character values which occupied 83.587% of total information amount were selected as the principal component. The two components contained nearly all the texture indexes. The combined score of the mechanical characteristics in 150 days＇ chicken tibia was the highest and the 100 days＇ chicken tibia was the lowest, which was fully consistent with the practical reality. Thus, this study provided a theoretical basis for evaluating chicken quality through distinguishing the bone age of chicken by the established model.