2019年最新整理电大《动物繁殖基础》期末复习考试真题及参考答案

试卷代号：2785

中央广播电视大学2010一2011学年度第二学期“开放专科”期末考试

动物繁殖基础试题

一、名词解释(每小题5分，共20分)

1．母畜的性成熟－－母畜的性成熟：母畜的性成熟是指家畜初情期以后的一段时期，此时生殖器官已发育成熟，具备了正常的繁殖能力，则称为性成熟。

2．发情周期－－母畜自第一次发情后，如果没有配种或配种后没有受胎，则每间隔一定时期便开始下一次发情，如此周而复始地进行，直到性机能停止活动的年龄为止。这种周期性的活动，称为发情周期。

3．情期受胎率－－情期受胎率表示妊娠母畜头数占配种情期数的百分率。

4．人工授精－－是以人为的方法，使用器械采集雄性动物的精液，再用器械把经特定处理后的精液输入到雌性动物生殖道的特定部位，以代替雌、雄动物的自然交配而繁殖后代的一种繁殖操作技术。

二、填空(每空2分，共20分)

1．牛、羊的子宫角基部之间有一纵隔，将二角分开，其子宫类型称为对分子宫；马无此隔，猪也不明显，其子宫类型称为双角子宫。

2. 促性腺激素释放激素的英文缩写为GnRH，由动物机体的下丘脑分泌，主要生理作用是促进腺垂体释放促黄体素(或LH) 和促卵泡素(或FSH)。

3. 三级卵泡和成熟卵泡含有卵泡腔，称为有腔卵泡。

4．精液是由固形成分的精子和液态成分的精清两部分组成。

三、单项选择题(每小题2分，共20分)

1．精子获能、受精和卵裂的场所为( B．输卵管 )。

A．卵巢 B．输卵管 C．子宫 D．阴道

2．根据生殖激素的化学性质，前列腺素属于( D．脂肪酸类激素)。

A．多肽激素 B．蛋白质激素 C．类固醇激素 D．脂肪酸类激素

3．雌性动物在初情期后，初级卵母细胞发生( A．第一次成熟分裂 )，生长发育成为次级卵母细胞。

A．第一次成熟分裂 B．第二次成熟分裂

C. 第三次成熟分裂 D．有丝分裂

4．下列动物中，( C．兔)属于诱发性排卵。

A．牛 B．猪 C．兔 D. 羊

5．在母畜发情周期的调节中，发情是受( C．雌激素和孕激素 )所调节的。

A．前列腺素和促黄体素 B．人绒毛膜促性腺激素和促卵泡素

C．雌激素和孕激素 D．孕激素和催产素

6．一般在酸性环境对精子的代谢和运动有作用，在碱性环境对其有作

用。(D．抑制促进)

A．促进促进 B．促进抑制

C．抑制抑制 D．抑制促进

7．羊的胎盘类型属于(B．子叶型胎盘)。

A．弥散型胎盘 B．子叶型胎盘 C．带状胎盘 D．圆盘状胎盘

8．胚胎在桑椹胚阶段，其营养物质主要来自( A．卵黄)。

A．卵黄 B．子宫乳

C．子宫上皮的细胞屑 D．通过胎盘血液循环摄取的母体营养物质

9．把分化程度较高的体细胞移入去核卵母细胞中，构建新合子的生物技术，称为(B．体细胞核移植 )。

A．胚胎细胞核移植 B．体细胞核移植

C．哺乳动物转基因技术 D．胚胎移植

10．在母畜发情周期的间情期，注射促性腺激素，如促卵泡素或孕马血清促性腺素、促使卵巢多数卵泡发育并排卵。这种方法称为( C．超数排卵 )。

A．诱发排卵 B．同期排卵 C．超数排卵 D．诱发发情

四、简答题（共40分）

1. 生殖激素的作用特点有哪些？（10分）

答：生殖激素的作用特点包括：

(1)生殖激素均有一定的靶器官(靶细胞)；(2分)

(2)生殖激素在血液中存留期短而引发作用的时间长；(2分)

(3)微量的生殖激素可产生巨大的生物学效应；(2分)

(4)生殖激素之间有协同或颉颃作用；(2分)

(5)生殖激素的生物学效应与动物所处的生理时期、激素的用量和使用方法有关。(2分)

2. 何为发情？正常发情时有哪些主要的行为变化？（10分）

答：1.母畜达到一定的年龄时，(1分)由卵巢上的卵泡发育引起的、(1分)受下丘脑—垂体—卵巢轴系调控的(2分)一种生理现象称为发情。

2.雌性动物的发情是在卵泡分泌的雌激素和少量孕激素的共同作用下，(2分)刺激中枢神经系统，引起性兴奋。其外观表现为兴奋不安、食欲减退、呜叫、喜接近公畜、举腰弓背、频繁排尿，或到处走动，愿意接受雄性交配，甚至爬跨其他雌性动物或障碍物。(2分)

3.雌激素对中枢神经系统的刺激作用需要少量孕激素的参与才能引起行为变化。雌性动物第一次发情时，由于卵巢没有黄体，血液中孕激素水平较低，(1分)常常发生安静发情，即只排卵而不表现发情征状。(1分)

3. 简述温度是如何影响精子的运动和代谢活动的？（10分）

答：体外保存的精子，一般在37～38℃温度下，(1分)在一定时间内可保持正常的代谢和运动状态。(1分)高于此温度，精子的活动能力和代谢作用加强，(1分)但也加速了精子的衰老和死亡过程，55℃左右瞬时死亡。(1分) 精子在体外保存，一般比较适应于低温环境，当精液经过适宜的稀释、缓慢的降温处理，在O～5℃温度下，(1分)精子的代谢活动和运动能力受到抑制，使之产生假死或休眠状态，(1分)当温度恢复时精子仍保持活动能力。精子的这种由假死状态恢复正常活动的能力称为精子复苏。(1分)

如果精液从37～38℃急剧下降至10℃以下时(超过20℃)，(1分)精子因受温度冲击后，即使当温度再回升到37～38℃，仍呈现不可逆地丧失活动能力，(1分)这种现象称其为精子的冷休克或低温打击。(1分)因此，为防止这种现象的出现，在精液处理过程中，要采取缓慢降温的方法，避免温度大范围内的剧烈变化。

4. 以奶牛为例，简述如何做好家畜的适时输精工作？（10分）

答：奶牛的发情周期平均是21d左右(18～24d)，发情时间较短，6～18h，排卵一般发生在发情结束后lO～16h，因此，准确的发情鉴定，适时输精是提高受胎率的保证。(5分)

实践表明，母牛在早上接受爬跨，可当日下午输精，如果次日早晨仍接受爬跨则应再输一次；母牛在下午或傍晚接受爬跨，可于第二天早晨输精。(3分)

一般间隔8～10h进行第二次输精。(1分)一次输精剂量的冷冻精液有效精子数，颗粒型为1200万以上，细管型为1000万以上，安瓿型为1500万以上。(1分)

请您删除一下内容，O(∩_∩)O谢谢！！！2015年中央电大期末复习考试小抄大全，电大期末考试必备小抄，电大考试必过小抄请您删除一下内容，O(∩_∩)O谢谢！！！2015年中央电大期末复习考试小抄大全，电大期末考试必备小抄，电大考试必过小抄The battle for young viewers CCTV is embracing Internet culture and working with independent producers on TV shows to woo audiences under 35. Han Bing bin reports. After charming audiences with his warm smile for 14 years, China Central Television host Li Jiaming recently found himself targeted by a group of young netizens unhappy with his style. The complaints came after Li hosted the premiere of Rising Star on Oct 31. It is a singing competition show that originated in Israel. Many young netizens found his hosting style slow and boring and mocked it as "CCTV evening gala style". They even initiated an online campaign to replace him. The 40-year-old host's reaction to the criticism was surprising. During the second episode, he jokingly called himself "the slow Jiaming" and acted much younger, talking faster and louder. "It's like selling a product. When the customers file a complaint, you must change," says Li. "In the Internet age, you get feedback very quickly. These young people are so cute. When you're willing to change for them, they will quickly like you back." In order to win

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