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1. Fowl spermatozoa incubated with DNA were used for the fertilisation of zona-free hamster oocytes. 2. Two categories of spermatozoa were detected: those which were not labelled and those which showed a very high degree of labelling (19 +/- 2% of the whole population). 3. In the hamster oocytes exposed to treated spermatozoa the labelled sperm heads were identified. 相似文献
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家鸡精液冷冻保护是物种资源保存最廉价的方法。本文从家鸡精液的稀释液、冷冻保护剂、冻精形式、平衡时间、冷冻速率、解冻速率、精液质量检测方法等几个方面,综述了国内外研究进展,并对目前家鸡精液冷冻技术应用存在的问题进行了分析,提出了初步研究思路。 相似文献
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Trefil P Polak J Poplstein M Mikus T Kotrbová A Rozinek J 《British poultry science》2003,44(4):643-650
1. The aim of the study was to investigate the possibility of preparing adult fowl testes for the production of exogenous germ-lines by eradication of recipient spermatogenesis using gamma-radiation. 2. A comparison between several radiation therapy treatments (based on 60Co isotope) of male testes was conducted using gamma-rays of 18, 22 and 26 Gy in a single dose or repeated doses of 5 x 8 Gy over a 15-d period. Sperm concentration and motility were determined after each treatment. 3. Altered spermatogenesis was observed after a single treatment dose of 18 Gy, while single doses of 26 Gy were followed by reduced sperm numbers (from 22 x 10(9) to 31 x 10(6) sperm/ml) within 60 to 100 d after treatment. After a single treatment of 26 Gy sperm motility was reduced by 50%. In contrast, a fractionated treatment (5 x 8 Gy) with gamma-rays halted spermatogenesis 39 d after the distribution of the first 8 Gy dose. 4. Observations of the seminiferous tubules by electron microscopy performed 12 months after this treatment confirmed that moderate doses of gamma-rays (8 Gy) distributed repeatedly (5 x) over a limited period (15 d) sterilise adult fowl testes but maintain morphologically normal somatic (Leydig and Sertoli) cell populations. 相似文献
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1. After intramagnal insemination egg production decreased drastically during the first two days and was equivalent to egg production of hens inseminated intravaginally for the remaining period of collection.
2. After magnal insemination, the fertility of eggs collected during the first week was 36.2% and only 3.6% during the second week.
3. In the case of intramagnal insemination, egg fertility in the first week was 88.1%, in the second week 81.8% and the third week 52.3%.
4. The eggs laid during the first day after intramagnal insemination were 83.3% fertile, indicating that treated spermatozoa fertilised the newly ovulated egg within 20 minutes of ovulation. 相似文献
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