Sundeen G, Richards J F, Bragg D B
Poult Sci. 1980 Oct;59(10):2225-36. doi: 10.3382/ps.0592225.
The effect of the dietary status of vitamin A on carbohydrate metabolism, postmortem isometric tension development, and shear resistance of Pectoralis major muscle was studied. Depletion studies conducted over a 5-week period indicated a definite influence of vitamin A deficiency on muscle carbohydrate metabolism. Mild hypovitaminosis A induced an increase in glycogen deposition, whereas severe deficiency led to a reduction of these elevated stores. Vitamin A deficiency did not affect the ability of P. major strips to develop isometric tension postmortem. The P. major strips sampled from deficient cockerels generally required longer to reach maximum tension than those of controls. The extended times to maximum tension reflected an increased muscle glycogen content. A significant increase in shear value similarly corresponded to the increased myofibrillar contraction noted in the later deficiency stages. Cockerels which had previously received for five weeks a ration completely deficient in vitamin A were utilized for a two-week repletion study. Although there was a distinct delay in response to the feeding of a vitamin A adequate ration, the muscle glycogen content, isometric tension parameters, and shear values of repleted birds were similar to those of controls within the two-week period.
研究了维生素A的饮食状况对碳水化合物代谢、死后等长张力发展以及胸大肌抗剪切力的影响。在为期5周的耗竭研究表明，维生素A缺乏对肌肉碳水化合物代谢有明确影响。轻度维生素A缺乏会导致糖原沉积增加，而严重缺乏则会导致这些升高的储备减少。维生素A缺乏并不影响胸大肌条在死后产生等长张力的能力。从缺乏维生素A的公鸡身上取样的胸大肌条通常比对照组的需要更长时间才能达到最大张力。达到最大张力的时间延长反映了肌肉糖原含量的增加。剪切值的显著增加同样与后期缺乏阶段观察到的肌原纤维收缩增加相对应。将之前连续五周喂食完全缺乏维生素A日粮的公鸡用于为期两周的补充研究。尽管在喂食充足维生素A日粮后的反应有明显延迟，但在两周内，补充维生素A的鸡的肌肉糖原含量、等长张力参数和剪切值与对照组相似。
