Growth and hormonal response of intact and castrate male cattle to trenbolone acetate and estradiol.
Growth and hormonal response of intact and castrate male cattle to trenbolone acetate and estradiol.
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完整和去势雄性牛对醋酸群勃龙和雌二醇的生长和激素反应。
DOI：
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发表时间：
1990
影响因子：
3.3
通讯作者：
L W Grimes
中科院分区：
文献类型：
--
作者：
C Y Lee;D. M. Henricks;G. C. Skelley;L W Grimes
采用完全随机设计（2 x 2析因排列），研究了去势和合成代谢植入物对牛体重增加、肋骨软组织成分和血清激素的影响。16头公牛和16头阉牛（安格斯或安格斯x婆罗门）中的一半年龄为9月龄，体重为290 kg，接受植入物（200 mg醋酸群勃龙和24 mg雌二醇）治疗。每组中有一半未接受植入物治疗。饲喂生长饲料95 d，每组屠宰一半。给药组动物再次植入醋酸群勃龙，饲喂肥育饲料84 d后屠宰。在来自第9-10- 11肋骨的软组织上测定干物质、脂肪和蛋白质的百分比。每2周从每只动物采集两份血样。测定血清中的五种激素。在生长阶段，未处理和处理的公牛和处理的阉牛增加了更多的重量，并有更瘦的肋骨部分，未处理的阉牛（P小于0.05）;在肥育阶段后，组间没有差异。未经处理的公牛有较低的胰岛素样生长因子（IGF-I）和较高的皮质醇浓度在这两个阶段的增长比未经处理的公牛（P <0.05）。在这两个阶段，植入物治疗增加了牛的IGF-I浓度，并在肥育阶段减少了皮质醇。（250字处删节）
Effects of castration and anabolic implants on weight gain, rib soft tissue composition and serum hormones were studied in cattle using a completely random design with a 2 x 2 factorial arrangement. Half of 16 bulls and 16 steers (Angus or Angus x Brahman) aged 9 mo and weighing 290 kg were treated with an implant (200 mg trenbolone acetate and 24 mg estradiol). Half of each group were not treated with an implant. A growing diet was fed for 95 d and half the animals in each group were slaughtered. Animals in the treated groups were reimplanted with trenbolone acetate and fed a finishing diet for 84 d and slaughtered. Percentage dry matter, fat and protein were determined on soft tissue from the 9-10-11th rib. Two blood samples were collected from each animal every 2 wk. Serum was assayed for five hormones. During the growing phase, untreated and treated bulls and treated steers gained more weight and had leaner rib sections that untreated steers (P less than .05); after the finishing phase, there were no differences among groups. Untreated steers had lower insulin-like growth factor (IGF-I) and higher cortisol concentrations during both phases of growth than untreated bulls did (P less than .05). Treatment with implants increased IGF-I concentrations in steers during both phases and reduced cortisol during the finishing phase.(ABSTRACT TRUNCATED AT 250 WORDS)
大鼠碱性生长调节素的分离和部分序列分析。
影响因子：
4.8
作者：
Rubin,JS;Mariz,I;Jacobs,JW;Daughaday,WH;Bradshaw,RA
通讯作者：
Bradshaw,RA