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阿特拉津影响大鼠生殖功能的初步研究 总被引：1，自引：0，他引：1
选用SD大鼠80只,体重(200±10)g,分别按照除草剂阿特拉津LD50值的1/2、1/4、1/20、0倍设置对照组和高、中、低3个处理组,每组20只,雌雄各半。阿特拉津配成乳浊液灌胃,于喂药15d和30d采样,测定大鼠血清中生殖激素(睾酮、雌二醇、卵泡刺激素、黄体生成素)含量,以及生殖器指数。结果表明:阿特拉津能够降低实验组血清促性腺激素和睾酮的含量,提高雌二醇含量,使雄性大鼠睾丸指数下降,雌性大鼠卵巢指数升高,从而影响大鼠生殖功能。 相似文献
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牛磺酸对肉仔鸡生产性能、免疫器官发育及抗氧化能力的影响 总被引：3，自引：0，他引：3
选用240只1日龄AA肉仔鸡,随机分为5组,每组3个重复.对照组饲喂玉米-豆粕型基础日粮,试验组在基础日粮中添加0.05%、0.10%、0.15%和0.20%的牛磺酸,试验期42 d.结果表明:(1) 日粮中添加0.10%牛磺酸,能够显著提高肉仔鸡平均日增重和饲料转化率(P＜0.05),显著提高3周龄肉仔鸡脾脏指数和6周龄法式囊指数(P＜0.05),显著提高肉仔鸡血清和3周龄肝脏超氧化物歧化酶(SOD)活性(P＜0.05),并显著降低3周龄血清和肝脏丙二醛(MDA)含量(P＜0.05).(2)添加0.15%的牛磺酸显著提高3周龄肉仔鸡脾脏和胸腺指数(P＜0.05).(3)日粮中添加0.20%的牛磺酸对肉仔鸡生产性能、免疫器官发育和抗氧化能力没有显著影响(P＞0.05). 相似文献
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试验旨在研究日粮中添加不同水平的牛磺酸对笼养蛋雏鸭生长性能和血糖血脂的影响。采用单因素完全随机分组设计,选用1日龄健康、体重相近金定蛋鸭240只,随机分为5个处理,每个处理6个重复,每个重复8只鸭。每个处理饲粮中分别依次添加0%、0.05%、0.10%、0.15%、0.20%的牛磺酸,试验期4周。结果表明:饲粮中添加0.10%牛磺酸可显著提高雏鸭的平均日增重、料重比(P<0.05);与对照组相比,饲粮中添加0.20%牛磺酸极显著降低了血清中总胆固醇浓度(TC)(P<0.01),显著降低了血清中甘油三酯(TG)、葡萄糖(GLU)的浓度(P<0.05)。由此得出,添加适宜水平的牛磺酸可显著改善雏鸭的生长性能,并在一定程度上降低血糖血脂。 相似文献
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不同鹿胎及胎盘制剂对老年雄性大鼠免疫机能影响的研究 总被引：4，自引：1，他引：3
研究了鹿胎及胎盘制剂对老年雄性大鼠免疫器官指数、血清球蛋白含量和巨噬细胞吞噬率及吞噬指数的影响。结果表明,鹿胎及胎盘制剂对老年雄性大鼠胸腺和脾脏指数影响不显著(P>0.05);但提高了老年雄性大鼠血清球蛋白含量,其中鹿胎制剂Ⅰ号组最高,比对照组高出62.64%,与其他各组相比有显著差异(P<0.05);鹿胎制剂Ⅱ号组和人胎盘粉处理组大鼠巨噬细胞吞噬率和吞噬指数与对照组相比有极显著提高(P<0.01),说明鹿胎及胎盘制剂对老年雄性大鼠具有提高免疫机能的作用。 相似文献
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会对母猪生产性能产生重要影响的因素主要有3个:①母猪的使用年限;②母猪的窝产仔数;③母猪的年产仔窝数。1母猪的使用年限延长母猪的使用年限可使猪场获得最佳的胎次结 相似文献
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M B Paster 《Veterinary Clinics of North America: Small Animal Practice》1991,21(6):1343-1359
Hypothalamic-releasing factors regulate the secretion of anterior pituitary hormones. The anterior pituitary gland secretes the same six hormones as found in mammals: FSH, LH, prolactin, GH (somatotropic hormone), ACTH, and TSH, plus the melanotropic hormone. The endocrine hormones of the avian posterior pituitary gland concerned with reproduction are mesotocin and AVT. The pineal gland, through the secretion of the hormone melatonin, modulates the periodic autonomic functions of the central nervous system. The ovary produces estrogens, progestogens, and androgenic compounds. The testes produce testosterones and progesterone. The thyroid glands produce two hormones, T4 and T3. The avian adrenal glands produce corticosterone and aldosterone. The bursa of Fabricius is considered an endocrine organ since it is involved in the production of humoral factors. The male reproductive system undergoes hormonal changes associated with puberty, the breeding season, and molt. Some avian species undergo a type of disintegration and seasonal reconstruction of the testis and epididymis. The relationship of the ovarian follicular hormones and the plasma hormones varies depending on the stage of the reproductive cycle and the seasonal photostimulation. Female birds may conceive in the absence of a mate as a result of the fertile period phenomena. The blood chemistry of laying birds is different from that seen in nonlaying hens. Domestication has had a definite influence on the hormone cycles of some avian species. This may lead to certain reproductive problems. 相似文献
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Charles J Innis Thomas H Boyer 《Veterinary Clinics of North America: Exotic Animal Practice》2002,5(3):555-78, vi
The study of reproductive diseases of chelonians has become increasingly sophisticated in the last decade. Widespread captive breeding has increased the number of reproductive problems presented to veterinarians. Advances in the level of veterinary care have encouraged chelonians owners to seek solutions to problems that may have previously been considered unsolvable. Improved diagnostic imaging, particularly radiography, ultrasonography and endoscopy, have made visualization and diagnosis of reproductive disease easier. Better quality veterinary care has made treatment of chelonian diseases more sophisticated which has lead to improved methods of anesthesia, surgery, and medicine. Concerns over rapidly diminishing chelonian populations and habitat have made the need for study of reproduction a higher priority; veterinary medicine has gained from this research. 相似文献
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