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《动物学》课程教学探讨 总被引:6,自引:1,他引:5
动物学是生物科学专业重要的专业基础课。结合自身教学实践,对动物学在专业课程体系和学生知识体系中地位进行再认识,并就该课程教学内容的构成、主要线索,教学过程,以及如何在教学过程中结合人文素质教育,拓宽学生视野,提高学生综合素质进行探讨。 相似文献
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长光照诱导红腹锦鸡当年雌鸡冬季繁殖效果的实验研究 总被引:5,自引:0,他引:5
红腹锦鸡 (Chrysolophuspictus)属鸡形目 ,锦鸡属 ,俗称锦鸡、金鸡 ,分布于我国北起宁夏固源 ,南到广西贺县 ,西至四川宝兴 ,东到湖北宜昌 ,即 :东经 10 2°40′~111°2 0′,北纬 2 4°39′~ 36°0 0′范围内 (余志刚等 ,1997)。红腹锦鸡为我国特产珍禽 ,国家Ⅱ级保护动物 ,因其羽色绚丽多姿、雍容华贵而著称于世 ,具有重要的经济价值 ,也是具有开发前景的特禽养殖新品种。已有的记述表明 ,红腹锦鸡雏鸡在第 2年 4~ 5月开始产卵 ,但是对此期间红腹锦鸡 1龄雌鸡的解剖观察发现 ,其卵巢尚未充分发育(吴至康 ,1991) ,还不… 相似文献
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光周期诱导红腹锦鸡冬季繁殖效果初报 总被引:6,自引:0,他引:6
?College of Life Science, Hebei Normal University, Shijiazhuang 050016, China)Golden pheasant ( Chrysolophus pictus) is a monotypic and special species of China.In nature, it breeds once a year in spring summer.From Oct.1998 to Feb.1999, we studied the effects of photo periods on inducing the birds to reproduce in winter and succeeded.In the experiment, 36 adult females and 18 males were divided into three groups.Each group was divided into 6 replicates, each replicate included 2 females and 1 male, and fed in one cage.All the groups were exposed to short day (8L∶16D) for 8 weeks, and then transferred to long day (12L∶12D, 14L∶10D or 16L∶8D). In result, photoperiods significantly affected Golden pheasant reproductive performance in winter.Considered of all of the reproductive performance indicators, the reproductive performance of the group exposure to 14L∶10D was the best, the 16L∶8D group's was less and the 12L∶12D group's was the worst.It may be that the birds' CDL (critical day length) for inducing egg production was about 12 h, and the CDL for optimal egg production was 14L∶10D in winter. The birds exposed to 12L∶12D had no fertilized egg.The other groups had fertilized eggs and the fertility was 15 05% (14L∶10D) and 20 41% (16L∶8D).The hatchability of fertilized egg were 76 47% (14L∶10D) and 80 00% (16L∶8D). The egg laying pattern was affected by the size of photoperiod.The ratio of lay of the birds exposed to 14L∶10D, increased rapidly and sustained in a peak level for 5 weeks, and then fall down.But the other birds (group A and C) increased to the peak at the first week and then fall down quickly. 相似文献
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钼(Mo)的生理及其生物学效应 总被引:11,自引:0,他引:11
钼是动植物及人体所必需的微量营养元素。钼是固氮酶、硝酸还原酶、黄嘌呤氧化酶、亚硫酸氧化酶等多种酶的重要组成成分,参与和影响机体内多种代谢过程。1 钼的吸收及其代谢植物主要通过根部从土壤中以钼酸根离子的形式吸收钼,植物的叶片也可以吸收钼,叶面施钼,作物吸收相对更快。一般来说植物钼的吸收和积累与土壤中钼的含量呈显著的正相关,但不同植物对钼的富集程度有差异。相同土壤浓度条件下,大豆比小麦、玉米具有更高的富集钼的生物学作用,而水稻则比小麦、玉米更弱。钼在植物体中分布,一般叶片中含量大于其它部位。动物及人体主要在… 相似文献
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红腹锦鸡秋季繁殖期能量收支及采食量研究 总被引:3,自引:0,他引:3
采用全收粪法对红腹锦鸡秋季繁殖期能量收支、采食量进行了定量分析,建立了红腹锦鸡秋季繁殖期代谢能摄入量(MEI, KJ)、采食量(FI)与代谢体重(W^0.75,kg)、体增重(△W,g/day)、产蛋量(EE,g/day)之间关系的回归方程(模式方程:Y=a+b1△W+b2EE).依据回归方程推算,基于实验饲料的红腹锦鸡秋季繁殖期雌鸡、雄鸡代谢能需要量分别是489.6 KJ/day和431.5 KJ/day、采食量分别是44.46 g/day和33.61 g/day. 相似文献