Gwartney B L, Jones S J, Calkins C R
Department of Animal Science, University of Nebraska, Lincoln 68583-0908.
J Anim Sci. 1992 Jul;70(7):2144-50. doi: 10.2527/1992.7072144x.
The response time to cimaterol (CIM), a beta-adrenergic agonist, by broiler chickens for carcass characteristics, muscle composition, muscle fiber size, catheptic enzyme activity, and tenderness was determined. Two trials were conducted in which chickens were fed a control diet (CON) containing 0 ppm of CIM or a diet containing 1 ppm of CIM. Trial 1 consisted of 55, 31-d-old broiler chickens individually fed for up to 48 h. At 0, 6, 12, 18, 24, and 48 h, five CON and five CIM-fed chickens were killed. Trial 2 consisted of 160, 33-d-old broiler chickens group-fed for up to 14 d. At 2, 4, 6, 8, 10, 12, and 14 d, 10 CON and 10 CIM-fed chickens were killed. The breast muscle (BM) and leg muscle (LM) weight, cathepsin B and L activities, DNA, RNA, and protein concentration, and BM shear force value (SFV) were measured in both trials. Thigh muscle (TM) SFV were measured in Trial 2 only. Fiber size of BM was measured (five birds per treatment) at d 2, 6, 10, and 14. In Trial 1, BM weight and SFV were lower in CIM-fed birds at 6 h (P less than .05). In Trial 2 BM SFV were higher at d 8 (P = .06) and d 10 (P less than .05) in CIM-fed chickens. The SFV of CIM-fed chickens were higher at d 4, 8, 10, 12, and 14 (P less than .05).(ABSTRACT TRUNCATED AT 250 WORDS)
测定了肉仔鸡对β-肾上腺素能激动剂西马特罗（CIM）在胴体特征、肌肉组成、肌纤维大小、组织蛋白酶活性和嫩度方面的反应时间。进行了两项试验，试验中鸡分别饲喂含0 ppm CIM的对照日粮（CON）或含1 ppm CIM的日粮。试验1包括55只31日龄的肉仔鸡，单独饲养长达48小时。在0、6、12、18、24和48小时，处死5只CON组和5只CIM饲喂组的鸡。试验2包括160只33日龄的肉仔鸡，分组饲养长达14天。在2、4、6、8、10、12和14天，处死10只CON组和10只CIM饲喂组的鸡。在两项试验中均测量了胸肌（BM）和腿肌（LM）重量、组织蛋白酶B和L活性、DNA、RNA和蛋白质浓度以及BM剪切力值（SFV）。仅在试验2中测量了大腿肌（TM）的SFV。在第2、6、10和14天测量了BM的纤维大小（每个处理5只鸡）。在试验1中，CIM饲喂组的鸡在6小时时BM重量和SFV较低（P小于0.05）。在试验2中，CIM饲喂组的鸡在第8天（P = 0.06）和第10天（P小于0.05）时BM SFV较高。CIM饲喂组的鸡在第4、8、10、12和14天的SFV较高（P小于0.05）。（摘要截短至250字）
