北京油鸡和海兰褐壳蛋鸡种公鸡精液品质比较及C2CD2和RYR2基因的差异表达分析

2019-09-04 03:49冯宇航齐晓龙邢凯
安徽农业科学 2019年9期

冯宇航 齐晓龙 邢凯

摘要 [目的]比较北京油鸡和海兰褐壳蛋鸡种公鸡的精液品质和性腺发育情况,并分析2品种间C2CD2和RYR2基因的表达差异。[方法]试验选取33周龄北京油鸡和海兰褐壳蛋鸡种公鸡各32只,从35周龄开始进行为期10周的精液品质检测。从2品种的每个重复中随机挑选1只种公鸡进行屠宰,记录其活体重、左右睾丸重以及鸡冠重并分析睾丸指数等,应用荧光定量PCR方法检测C2CD2和RYR2基因在2品种睾丸组织中的表达水平。[结果]海兰褐壳蛋鸡种公鸡的精子密度、精子总数和性腺发育情况均优于北京油鸡。C2CD2基因在北京油鸡中的表达量高于海兰褐壳蛋鸡,而RYR2基因在北京油鸡中的表达量显著低于海兰褐壳蛋鸡(P<0.05)。[结论]海兰褐壳蛋鸡的精子密度、精子总数和性腺发育情况均优于北京油鸡,RYR2基因可作为提高鸡精子总数的候选基因。

关键词 精液品质;精子总数;北京油鸡;海兰褐壳蛋鸡;C2CD2基因;RYR2基因

中图分类号 S831.5 文献标识码 A

文章编号 0517-6611(2019)09-0100-03

doi:10.3969/j.issn.0517-6611.2019.09.029

Abstract [Objective] To compare the semen quality, gonadal development status of cock bred between BeijingYou chicken and Hyline brown laying hens, and analyze the differential expression of C2CD2 and RYR2 genes between the two breeds. [Method] 32 33weekold cock breeds of BeijingYou chicken and Hyline brown laying hens were selected. The semen quality testing was carried out for 10 weeks from 35weekage. One cock bred was randomly selected for slaughter from each repeat of two breeds, and the live weight, left and right testis weight and comb weight were recorded and the testicle index was analyzed. The expression level of C2CD2 and RYR2 genes in testicular tissue of two breeds was detected by Realtime PCR.[Result] The sperm density, total sperm count and gonad development of Hyline Brown laying hens were better than those of BeijingYou chicken. The expression amount of C2CD2 gene in BeijingYou chicken was higher than that of Hyline Brown laying hens, and the expression amount of RYR2 gene in BeijingYou chicken was significantly lower than that of Hyline Brown laying hens(P<0.05). [Conclusion] The sperm density, total sperm count and gonad development of Hyline Brown laying hens were better than that of BeijingYou chicken. RYR2 genes can be used as candidate genes for total sperm count of chicken.

Key words Semen quality;Total sperm count;BeijingYou chicken;Hyline brown laying hens;C2CD2 gene;RYR2 gene

隨着现代集约化高效养禽业的发展,人工授精技术在实际生产中已经普遍应用。在大规模种鸡生产中,种蛋受精率会影响种蛋和雏鸡的质量,也会影响孵化率,从而影响育成期的产蛋性能,最终影响蛋鸡养殖场的经济效益[1-3]。精液品质是决定种蛋受精率的重要因素之一。北京油鸡是我国的优良地方品种,肉蛋品质兼优,但产蛋量较低。海兰褐壳蛋鸡是美国海兰国际公司培育的四系配套优良蛋鸡品种,饲料报酬、产蛋量和成活率均较高[4-5]。笔者选取这2个有代表性的品种进行精液品质和性腺发育情况的比较。

C2CD2(C2 domaincontaining 2)和RYR2(ryanodine receptor 2)基因均在维持细胞内钙稳态过程中发挥生物学作用,而细胞内钙稳态以及Ca2+浓度在生精细胞分化成熟、精子顶体反应和获能过程中均发挥着重要的作用。因此,研究C2CD2基因和RYR2基因在北京油鸡和海兰褐壳蛋鸡中的表达差异,可为鸡精液品质的候选基因挖掘奠定理论基础。

1 材料与方法

1.1 试验动物

试验选取33周龄、体况一致的北京油鸡和海兰褐壳蛋鸡种公鸡各32只。将每个品种进行随机分组,每个品种4个重复,每个重复8只鸡。试验鸡饲养与管理条件相同。

4 结论

海兰褐壳蛋鸡种公鸡的精子密度、精子总数和性腺发育情况均优于北京油鸡,RYR2基因可作为提高鸡精子总数的候选基因。

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