日粮添加大豆黄酮对去势仔猪生长性能及有关内分泌的影响   总被引：20，自引：0，他引：20  

郭慧君  韩正康  王国杰 《中国畜牧杂志》2002,38(2):17-18

断奶仔猪 (公母均去势 )随机分为对照组和实验组 ,分别饲喂基础日粮和基础日粮添加 5mg/kg日粮的大豆黄酮 ,试验期持续一个月。与对照组相比 ,实验组的增重和饲料利用率均有所改善 ,但存在明显的性别差异 :雄性去势仔猪增重提高 5 9.15 % (P <0 .0 1) ,但雌性去势仔猪低 2 6 .39% (P <0 .0 5 ) ;血液胰岛素样生长因子 (IGF I)含量平均提高 2 6 .6 0 % (P <0 .0 5 ) ,公、母分别为提高 5 0 .91%和降低 9.6 6 % ;睾酮含量提高 17.4 6 % (P <0 .0 5 ) ,其中雄性提高 18.4 1% ,而雌性降低 6 .86 % ;血钙含量提高 11.78% (P <0 .0 5 ) ,其中雄、雌分别提高 17.92 % (P <0 .0 5 )和 6 .4 7%。上述实验结果表明 ,大豆黄酮对去势仔猪生长和有关激素状态表现明显的性别差异性。能够显著促进去势仔公猪生长和睾酮、IGF I分泌 ,而对雌性去势仔猪则起抑制性影响  相似文献   

锰对公鸡繁殖性能和血清LH睾酮含量的影响   总被引：1，自引：1，他引：0  

曹盛丰  叶陈梁  陈希玉  陈桂根  顾永远 《动物营养学报》1992,(2)

本文用组织学和放射免疫分析法就饲粮锰对公鸡睾丸组织学和血清睾酮、促黄体生成激素(LH)含量的影响进行了研究,并对公鸡的繁殖性琵进行了观察。结果表明,与Ⅲ组(添加锰100ppm)相比,缺锰的Ⅰ组(添加锰0ppm)或高锰的Ⅳ组(添加锰300ppm)辜丸生长发育受阻,曲细精管管径变小,精子数减少,种蛋孵化率下降,血清睾酮含量降低,LH含量略有上升。结果提示:缺锰或高锰日粮引起公鸡繁殖性能下降的重要原因之一是由于锰影响了睾丸间质细胞睾酮的分泌。  相似文献   

Stallion-like Behavior in Mares: Review of Incidence, Characteristics, Ovarian Activity, and Role of Testosterone     

M.O. Gastal DVM  PhD  E.L. Gastal DVM  PhD  M.A. Beg DVM  PhD  O.J. Ginther VMD  PhD   《Journal of Equine Veterinary Science》2007,27(9):390-393

Stallion-like sexual behavior in mares is rare, except in association with ovarian tumors or hormonal treatments. The rarity of the phenomenon was confirmed in a recent 3-year study. The mean number of mares with detected stallion-like behavior, including mounting with thrusts, during an entire ovulatory season was 5.7 (17/3 years) in a herd averaging 105 mares (5% incidence/mare/season). From a total of 17 mountings of an estrous mare by another mare, 15 occurred when the mounting mare was in the follicular phase and two when in the early luteal phase. Plasma testosterone concentration on the day of mounting was higher (P < 0.01) in the mounting mares (17.7 ± 2.3 pg/ml) than in the standing mares (10.9 ± 0.5 pg/ml). No other deviation in the endocrine, behavioral, or morphologic aspects of the estrous cycle was observed. In another study, testosterone was assayed daily from 7 days before to 4 days after ovulation in seven mares during estrous cycles with no detected mare-on-mare mountings. Concentrations during the follicular phase were highest on the days corresponding to when mare-on-mare mounting was detected in the previous study. It is concluded that the rare occurrence of stallion behavior by untreated mares with no detected ovarian tumors is a consequence of an unusually high, apparently transient fluctuation in circulating testosterone at the time of mounting.  相似文献   

公绵羊血清催乳素、促黄体素和睾酮含量在配种季节的变化及外源催乳素对其含量的影响     

夏国良  杨传任 《畜牧兽医学报》1991,(1)

对8头种公羊在整个秋季配种季节中血清催乳素含量的变化及与睾酮和促黄体素(LH)水平之间的关系进行了研究。结果表明公羊催乳素水平并不是象文献报道的在秋季配种季节开始前下降,而是在配种季节开始有一个高峰(从104ng到150ng/ml)。该峰持续一个月才开始下降。在催乳素峰同时睾酮水平也呈现峰值,而此时血清中LH则无变化。在配种季节的第一个配种期(8月,实验场地规定)和非交配期(9月)分别给公绵羊注射催乳素(1.5mg/头)。连续采血测定血清中各激素水平的结果表明在这两段时间注射催乳素2小时后血清中睾酮水平总含量和总平均值显著地高于对照组(第一个配种期时分别为:17.79±2.54对3.85±0.61,P<0.01和2.20±0.66对0.48±0.09,P<0.001;非交配期分别为4.88±1.06对1.13±0.24,P<0.05和1.22±0.31对0.28±0.04,P<0.025),而且此时睾酮水平与LH水平无关,因为此时血清中LH水平无明显变化。从上述结果看出催乳素在体内的骤然增加可以促使公绵羊血清中睾酮水平升高,而且睾酮的这种增加并不是通过催乳素促使LH分泌引起的。推测在季节性生殖的公绵羊由性活动静止到活跃的这一特殊时间内,催乳素的升高是促进睾酮分泌的一个重要因子。  相似文献   

XX／XY真两性畸形猪发病机理探讨     

邱家祥  张中庸 《华北农学报》1990,5(1):105-110

供试真两性畸形猪表型雌性,有不规则的雌性情期.该猪为38,XX/XY嵌合体.X染色质阳性率30.66%.左侧阴囊内为卵睾,卵巢表面有发育成熟的滤泡,睾九曲细精管内无精子,Leydig细胞被结缔组织替代;右侧卵睾隐于腹腔内,睾丸曲细精管缺如,Leydig细胞增多,卵巢发育良好.在发情周期中雌激素(E)和睾酮(T)呈规律性波动.在连续5周的血样分析中,血浆T含量高出雌性对照一倍,与雄性对照差异不显著(P>0.05);血浆E含量与雌雄对照差异均极显著(P<0.01).给予LH负荷后,血浆T2小时达峰值,是注射前的近5倍;第3小时降至基础值.本研究通过对真两性畸形猪卵巢的发生和性染色体嵌合型以及性激素和副性器官分化的分析,探讨了性别畸形发病机理的部分问题.  相似文献   

激光照射对雄性梅花鹿睾酮,雌二醇含量影响的试验     

李枫  许文书 《野生动物》1994,(3):39-42

本文以８头雄性梅花鹿为材料，应用输出功率１７ｍｗ，能量密度为５７．７２Ｊ／ｃｍ２的氦氖激光对其中４头进行照射试验；应用放射免疫测定法测其外周血清中睾酮、雌二醇含量的变化。结果表明：激光照射能够影响梅花鹿外周血清中性激素水平，使睾酮和雌二醇水平显著下降（Ｐ＜０．０５），睾酮降低４１．２５％，雌二醇降低４３．５５％。  相似文献   

Altered plasma concentrations of sex hormones in cats infected by feline immunodeficiency virus or feline leukemia virus     

Tejerizo G  Doménech A  Illera JC  Silván G  Gómez-Lucía E 《Domestic animal endocrinology》2012,42(2):113-120

Gender differences may affect human immunodeficiency virus (HIV) infection in humans and may be related to fluctuations in sex hormone concentration. The different percentage of male and female cats observed to be infected by feline leukemia virus (FeLV) or feline immunodeficiency virus (FIV) has been traditionally explained through the transmission mechanisms of both viruses. However, sexual hormones may also play a role in this different distribution. To study this possibility, 17β-estradiol, progesterone, testosterone, and dehydroepiandrosterone (DHEA) concentrations were analyzed using a competitive enzyme immunoassay in the plasma of 258 cats naturally infected by FIV (FIV(+)), FeLV (FeLV(+)), or FeLV and FIV (F(-)F(+)) or negative for both viruses, including both sick and clinically healthy animals. Results indicated that the concentrations of 17β-estradiol and testosterone were significantly higher in animals infected with FIV or FeLV (P < 0.05) than in negative cats. Plasma concentrations of DHEA in cats infected by either retrovirus were lower than in negative animals (P < 0.05), and F(-)F(+) cats had significantly lower plasma values than monoinfected cats (P < 0.05). No significant differences were detected in the plasma concentration of progesterone of the four groups. No relevant differences were detected in the hormone concentrations between animal genders, except that FIV(+) females had higher DHEA concentrations than the corresponding males (P < 0.05). In addition, no differences were observed in the hormone concentrations between retrovirus-infected and noninfected animals with and without clinical signs. These results suggest that FIV and FeLV infections are associated with an important deregulation of steroids, possibly from early in the infection process, which might have decisive consequences for disease progression.  相似文献   

催乳素调节绵羊睾丸间质细胞睾酮分泌机制的研究   总被引：7，自引：0，他引：7  

夏国良  庄临之 《畜牧兽医学报》1995,26(5):385-390

本实验利用睾丸间质细胞体外培养方法，研究了催乳素（ＰＲＳ）对睾酮分泌调节的机制。结果表明，体外培养的绵羊睾丸间质细胞对激素的刺激在培养的前四天较敏感。ｈＣＧ依剂量关系刺激睾酮的分泌。ＰＲＬ对ｈＣＧ的刺激作用起着双相调节作用：低剂量的ＰＲＬ（１￣３０ｎｇ／ｍｌ）可以增加ｈＣＧ的刺激强度３５￣７１％，而高剂量的ＰＲＬ（１０００ｎｇ／ｍｌ）则抑制ｈＣＧ的活性４０％。当培养液中加入不同剂量的睾酮合成前体物  相似文献   

IGF-I对山羊睾丸间质细胞分泌cAMP和睾酮的影响     

Cao Binyun  Li Jian  Wang Jianchen 《天津农学院学报》1998,(1)

本实验利用山羊睾丸间质细胞体外培养的方法,研究ＩＧＦ－Ｉ对ｃＡＭＰ和睾酮的影响。结果表明：（１）ＩＧＦ－Ｉ可使间质细胞外ｃＡＭＰ积聚能力显著增强（ Ｐ＜０． ０５～ Ｐ ＜０． ００５）。（２）ＩＧＦ－Ｉ可使间质细胞分泌睾酮的能力显著增加（Ｐ＜０．０５～Ｐ＜０．０１）。（３）ＩＧＦ－Ｉ可刺激山羊间质细胞经 ｈＣＧ诱导睾酮分泌显著增多（ Ｐ＜０． ０５～ Ｐ＜０． ０１）。以上结果与催乳素和白细胞介素－１α这些含氮激素（因子）调节睾酮分泌的机理不同。  相似文献   

Induction of precocious maturation in masculinized Atlantic salmon by treatment with sustained-release LHRHa and testosterone     

J.C. Henry  E. McLean  I. Mayer  E.M. Donaldson 《Aquaculture International》1998,6(4):261-268

The effect of treating immature, masculinized, Atlantic salmon, Salmo salar, with testosterone or [Des-Gly10] D-Ala6-LHRH ethylamide (LHRHa), either alone or in combination, over an 81 day period was evaluated as a method for accelerating maturation. Two sustained-release LHRHa implants were compared: ethylene vinyl acetate copolymer (EVAC) and silicone elastomer. Animals primed with testosterone did not express advanced spermatogenesis when compared against control salmon (p > 0.05). However, fish primed with testosterone, followed by sham, LHRHa EVAC, or LHRHa silicone elastomer implants expressed increased (p < 0.05) gonadosomatic index (GSI) when compared with values derived from day 0 of the study. Neither spermatogenesis nor GSI were affected when salmon were treated with LHRHa alone, irrespective of the vehicle employed. In contrast, spermatogenesis was significantly (p < 0.05) advanced in testosterone-treated fish, which were administered LHRHa by EVAC, when compared with groups that received individual treatment only. © Rapid Science Ltd. 1998  相似文献