不同品系优质鸡肌纤维生长规律及其与肉品质的关系

Analysis on muscle fiber development and muscle quality in pure lines of quality broilers

以3个日龄的5个品系F、D、Y、S、B优质肉鸡为试验对象,采用组织化学切片染色技术进行组织学观察,探讨优质鸡肌纤维的发育规律及其对肉品质的影响.结果表明,随着日龄的增加鸡肌纤维的发育呈明显变化.70-90日龄的肌纤维面积的生长强度小于90-120日龄,而肌纤维密度70-90日龄的生长强度大于90-120日龄.同一生长阶段不同品系间肌纤维的生长强度也明显不同,生长较快的D系肌纤维生长强度最大.相关分析表明,肌纤维面积与肌纤维密度呈极显著负相关(P<0.01),与硫胺素含量呈显著正相关(P<0.05),与嫩度、肉色、肌内脂肪含量、肌苷酸含量呈正相关,但相关性不显著(P>0.05).可见,肌纤维的生长发育对肌肉的干物质、肌内脂肪等肉质性状及硫胺素、肌苷酸等风味物质的产生有利.

5 quality broiler lines at three growth stages were selected for study. Histocbemical staining technique was used to explore the effect of muscle fiber development and muscle quality in quality broiler. The results indicated that muscle fibers of chicken ap- pcared a significant development with days increasing, uad which showed a lower growth intensity at the age of 70 - 90 days than those at the age of 90 - 120 days in the fiber areas. Just right opposite compare with the fiber areas, at the age of 70 - 90 days growed higher than those at the age of 90 - 120 days in the fiber density. The muscle fiber of differeni lines had different growth in- tensity at the same period, line D grew much faster than others. Correlation analysis showed that the fiber areas had a significant negative correlation with fiber density （P 〈0.01 ）, and significant positive correlation with thiamine （P 〈0.05）, but no significant positive correlations with tenderness, meet color, intramuscular fat, and ionsine monophosphate （ P 〉 0.05 ）. The growth and devel- opment of muscle fiber may have positive effects on muscle quality traits, such as dry matter, intramuscular fat, and thiamine, ion- sine monophosphate of flavor compounds.