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选择15只年龄为9日龄的幼龄白鹭进行试验,随机分为A,B,C3组,A组为对照组,喂以鱼鳅,B,C两组为试验组,B组喂鱼鳅及配合饲料,C组在B组的基础上用4g配合料代替4g鱼鳅,饲喂量每周增加一次,试验期为90天。结果表明,试验B与与对照A组和试验C组相比,在增重方面,差异显著（P＜0．05）,而在体长、咀裂长,翼展度等生长发育指标上差异均不显著（P＞0．05）。因此,以营养需要方面考虑,在49日龄以前完全可用30％的人工配合饲料,在49日龄以后,可以用50％的人工饲料来代替白鹭天然的动物性饲料。 相似文献
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Narindra H. Roopnarine Sunil K. Gupta Lizette du Plessis Tom A. Aire 《Anatomia, histologia, embryologia》2020,49(6):814-819
It remains a major concern that sperm structure has continued to be poorly investigated and reported in avian species. To our knowledge, sperm structure in the order Pelecaniforme has not been reported. Although McFarlane (1963; Proceedings of the XIII International Ornithological Congress; Ithaca, NY; American Ornithologists’ Union) reported the study of spermatozoa in two genera and two species of the family Ardeidae, he did not provide an account, or the names of the species examined. The present report on the sperm structure of the cattle egret, Bubulcus ibis, is, thus, the first in the order Pelecaniformes (this bird has been placed variably under the order Ciconiiformes, or the order Pelecaniformes). Five sexually mature and reproductively active male cattle egrets were obtained from the wild, humanely euthanized, the reproductive organs dissected out, and tissues from the ducti deferentia were prepared for transmission electron microscopy. The sperm structure of this bird is generally similar to that described for most non-passerine birds. However, the acrosome is a short, conical or bullet-shaped, blunt-ending organelle that lacks a perforatorium. The base of the acrosome is flat and makes contact with the nucleus along, a correspondingly flat plane. The nucleus, thus, ends anteriorly in a flat plane devoid of a concavity or a rostrum, and an endonuclear canal. The acrosomal and nuclear features of this bird are, therefore, main deviations from the situation in the non-passerine clade of birds. 相似文献
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2006年5月,对贵州中部的鹭鸟群巢进行了调查,共记录到11个繁殖群、1587巢,种类包括小白鹭(Egretta garzetta)、牛背鹭(Bubulcus ibis)、池鹭(Ardeola bacchus)、夜鹭(Nycticorax nycticorax)和苍鹭(Ardea cinema).最大的繁殖群在黄平风云崖和赤水宴府.种类以小白鹭为优势种,其巢数量占总巢数的49.7%;而苍鹭最少,仪占0.1%.所有鹭鸟巢均只发现于贵州中、北部,而南部的雷公山地区没有调查到.鹭鸟群巢在贵州中部的分布明显受到农田种植模式(冬天种植小麦和油菜,夏天种植水稻)的影响,繁殖巢主要分布于稻作区.但在贵州南部的主要稻作区却没有发现鹭鸟繁殖群巢,其原因尚待调查.对贵州黄平和赤水这两个较大鹭鸟群巢所在地需重点加以保护. 相似文献
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2019年至2021年对云南省昆明市呈贡回回营社区混合集群的鹭鸟开展调研,分别于2019年10月, 2021年4、5、6月对鹭群进行4次访问。2019年10月,鹭鸟繁殖栖息地主要由竹子和少量桉树构成,地面覆盖大量落叶;其间污水流淌,形成数条小河和一个池塘。2021年统计每棵竹子和桉树上鹭巢数量及营巢鹭鸟种类,并测量巢距离地面的垂直高度。该地发现有小白鹭、黑顶夜鹭和牛背鹭筑巢繁殖,其中小白鹭和黑顶夜鹭构成群落数量主体。2021年4月记录21个鹭巢（小白鹭与黑顶夜鹭）,5月记录41个鹭巢（小白鹭、黑顶夜鹭和牛背鹭;此月为繁殖高峰）,6月记录8个鹭巢。鹭巢距离地面平均距离为8.78 m。目前,该鹭群由于回回营面临拆迁而受到威胁,为此提议保留鹭群所在的繁殖地,并改善研究地点及周边地区水质情况。 相似文献
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