This study was designed to evaluate the effects of guanidinoacetic acid (GAA) on growth performance, carcass characteristics, meat and muscle fibre traits of growing–finishing gilts. 300 female PIC pigs were randomly divided (30.10 ± 2.94 kg) into 2 treatments with 6 replicates of 25 each for a 100‐day trial. Two dietary treatments were comprised of a control diet and a control diet fortified with 450 mg/kg GAA. Growth performance was evaluated for each phase. Carcass characteristics and meat quality were determined at last phase. Gilts had free access to feed and water during the experiment. The result indicated that GAA did not affect growth performance (p > 0.05). GAA not only increased longissimus dorsi (LM) muscle weight but also decreased its shear force, b*value and drip loss (p < 0.05). Mandibular fat index was decreased by GAA (p < 0.05). GAA upregulated myosin heavy chain (MyHC) I mRNA expression with lower myofibre cross‐sectional area and fibre diameter in LM muscle (p < .05). In conclusion, GAA can improve carcass characteristics and meat quality by changing muscle fibre characteristics and reducing mandibular fat index in finishing gilts.

中文翻译：

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日粮胍基乙酸补充剂可改善生长肥育后备母猪的cas体特性，肉质和肌肉纤维性状。

这项研究旨在评估胍基乙酸（GAA）对生长肥育后备母猪生长性能，car体特性，肉和肌纤维特性的影响。将300只雌性PIC猪（30.10±2.94千克）随机分为2种处理，每6份重复，每组25份，进行100天试验。两种饮食疗法包括对照饮食和以450 mg / kg GAA强化的对照饮食。评价每个阶段的生长性能。在最后阶段确定Car体特性和肉质。实验期间，小猪可以自由进食饲料和水。结果表明，GAA不会影响生长性能（p>  0.05）。GAA不仅增加了背最长肌（LM）的肌肉重量，而且还降低了其剪力，b *值和滴水损失（p ＜  0.05）。下颌脂肪指数通过GAA降低（p  <0.05）。GAA上调了LM肌肉的肌原纤维横截面积和纤维直径，从而增加了肌球蛋白重链（MyHC）I mRNA的表达（p  <.05）。总之，GAA可通过改变后备母猪的肌肉纤维特性和降低下颌脂肪指数来改善improve体特性和肉品质。