Physiological and hormonal responses of lambs repeatedly implanted with zeranol and provided two levels of feed intake.
Physiological and hormonal responses of lambs repeatedly implanted with zeranol and provided two levels of feed intake.
复制标题
反复植入玉米赤霉醇并提供两种水平采食量的羔羊的生理和激素反应。
DOI：
10.2527/1996.74102376x
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发表时间：
1996
影响因子：
3.3
通讯作者：
N. Turner
中科院分区：
文献类型：
--
作者：
G. D. Hufstedler;P. L. Gillman;G. Carstens;L. W. Greene;N. Turner
40 只杂交鸽（平均体重 30 公斤）每隔 30 天植入玉米赤霉醇（12 毫克），并以 2 x 2 因子排列的处理方式按两个摄入水平饲喂，以确定性能、胴体和骨骼特征、血液代谢物和激素。限制性羔羊的体重是自由采食羔羊体重的一半。自由采食和限制采食的羔羊分别在98天和154天后被屠宰。玉米赤霉醇可增加平均日增重 (P = .047; 20%)、饲料增益 (P = .023; 17%)、掌骨长度 (P = .004; 6%) 和重量 (P = .013; 13%)，并倾向于增加胴体粗蛋白增益 (P = .106; 63%)，同时减少肾盆腔脂肪 (P = .001; 13%)。 33%) 和敷料百分比 (P = .038; 3%)。限制采食量使胴体灰分和掌骨长度和重量的百分比分别增加 27% (P = .048)、5% (P = .006) 和 10% (P = .045)，同时降低质量等级分数 (P = .022; 5%)、饲料增益 (P = .001; 49%)、最长肌面积 (P = .001) .001；28%）、肾盆腔脂肪百分比（P = .033；13%）和每日脂肪增加（P = .001；54%）。玉米赤霉醇增加垂体重量 (P = .001; 166%)、血浆葡萄糖 (P = .036; 13%)、平均血清生长激素 (GH; P = .011; 52%)、基线 GH (P = .048; 34%)、GH 脉冲幅度 (P = .003; 59%) 和 IGF-I (P = .001; 59%)。 53%）浓度。结果表明，从 60 日龄到屠宰期间连续施用玉米赤霉醇会增加 GH 释放，从而指导养分利用，从而在养分利用率充足时获得具有更理想的瘦肉和脂肪沉积模式的胴体。
Forty crossbred wethers (average weight 30 kg) were implanted with zeranol (12 mg) at 30-d intervals and fed at two levels of intake in a 2 x 2 factorial arrangement of treatments to determine performance, carcass and bone characteristics, blood metabolites, and hormones. Restricted lambs were fed to gain one-half the BW gained by lambs with ad libitum feed access. Lambs with ad libitum and restricted access to feed were slaughtered after 98 and 154 d, respectively. Zeranol increased ADG (P = .047; 20%), gain to feed (P = .023; 17%), metacarpal length (P = .004; 6%) and weight (P = .013; 13%), and tended to increase carcass crude protein gain (P = .106; 63%) while reducing kidney pelvic fat (P = .001; 33%) and dressing percentage (P = .038; 3%). Restricted feed intake increased the percentage of carcass ash and metacarpal length and weight by 27% (P = .048), 5% (P = .006), and 10% (P = .045), respectively, while reducing quality grade scores (P = .022; 5%), gain to feed (P = .001; 49%), longissimus muscle area (P = .001; 28%), the percentage of kidney pelvic fat (P = .033; 13%), and daily fat gain (P = .001; 54%). Zeranol increased pituitary weight (P = .001; 166%), plasma glucose (P = .036; 13%), mean serum growth hormone (GH; P = .011; 52%), baseline GH (P = .048; 34%), GH pulse amplitude (P = .003; 59%), and IGF-I (P = .001; 53%) concentrations. The results indicate that continuous administration of zeranol from 60 d of age to slaughter increases GH release, which directs nutrient utilization such that a carcass with more desirable lean and fat deposition patterns is obtained when nutrient availability is adequate.