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通过筛选甘油浓度和冷冻速率来提高 straws 中公鸡精液的质量。

Improving the quality of rooster semen frozen in straws by screening the glycerol concentration and freezing rate.

机构信息

Department of Poultry Research, Hunan Institute of Animal Husbandry and Veterinary Research, Changsha City, China.

College of Veterinary Medicine, Hunan Agricultural University, Changsha, China.

出版信息

Br Poult Sci. 2020 Apr;61(2):173-179. doi: 10.1080/00071668.2019.1686126. Epub 2019 Nov 13.

DOI:10.1080/00071668.2019.1686126
PMID:31661973
Abstract
  1. This study examined different glycerol concentrations (GC) and freezing rates to improve the quality of rooster spermatozoa frozen in straws, and to determine the effect of varying GC on post-thawed spermatozoa quality, as evaluated by fertility and hatchability.2.The experiment included two tests. In test 1, rooster semen straws containing 2, 4, 6, 8 and 11% glycerol were put in a rack (nine tiers with a 1 cm interval between every two tiers, 1 to 9 cm above liquid nitrogen (LN) source), and gradually frozen. The semen straws located in different tiers experienced different temperatures and freezing rates. The straws were then thawed and live sperm numbers determined. In test 2, rooster semen straws containing 2, 4, 6, 8 and 11% glycerol were put on optimal tiers (identified in test 1) for freezing, and stored at -196°C. Hens were inseminated with the frozen semen (post-thawed and glycerol removed, about 4.0 × 10 sperm per hen), and eggs incubated.3. The numbers of live sperm in the 11% glycerol group was higher than that in 2, 4 or 6% glycerol group (P < 0.05) for the semen straws on tiers 1 to 9, while that on tiers 1 to 5 was lower than that on tier 6 to 8 (P < 0.05). GC, freezing rate and the interaction between GC and freezing rate had a significant effect on live sperm numbers ( < 0.01). The highest fertility was in the 6% glycerol group and occurred on day 5 after insemination. The lowest fertility occurred in the 2% glycerol group on day 10 after insemination.4. The optimal combination was 11% glycerol in straws located 6 cm above the LN surface (on tier 6). The 6% glycerol group achieved the highest fertility (77.6%), which surpassed that reported in recent years.
摘要
  1. 本研究旨在探讨不同甘油浓度(GC)和冷冻速率对鸡精液 straw 冷冻效果的影响,以提高 straw 中精子的质量,并确定 GC 对解冻后精子质量的影响,通过受精率和孵化率来评估。

  2. 实验包括两个测试。在测试 1 中,将含有 2%、4%、6%、8%和 11%甘油的鸡精液 straw 放置在架子上(9 层,每层之间的间隔为 1 厘米,距离液氮(LN)源 1 至 9 厘米),逐渐冷冻。位于不同层的 straw 经历了不同的温度和冷冻速率。然后解冻 straw 并测定活精子数量。在测试 2 中,将含有 2%、4%、6%、8%和 11%甘油的鸡精液 straw 放置在最佳层(在测试 1 中确定)进行冷冻,并储存在-196°C。用冷冻精液(解冻后去除甘油,每只母鸡约 4.0×10 个精子)对母鸡进行授精,并孵化鸡蛋。

  3. 在 11%甘油组中,活精子数量在 straw 位于 1 至 9 层时高于 2%、4%或 6%甘油组(P<0.05),而在 straw 位于 1 至 5 层时低于 6%至 8%层(P<0.05)。GC、冷冻速率以及 GC 和冷冻速率之间的相互作用对活精子数量有显著影响(<0.01)。6%甘油组的受精率最高,在授精后第 5 天;2%甘油组的受精率最低,在授精后第 10 天。

  4. 最佳组合为 straw 中 11%甘油,位于 LN 表面上方 6 厘米处(在第 6 层)。6%甘油组的受精率最高(77.6%),超过了近年来的报道。

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