The Maintenance Nitrogen Requirement of the Zebra Finch Taeniopygia guttata
The Maintenance Nitrogen Requirement of the Zebra Finch Taeniopygia guttata
复制标题
斑胸草雀的维持氮素需求
DOI：
10.1086/320431
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发表时间：
2001
影响因子：
1.6
通讯作者：
I. Hume
中科院分区：
文献类型：
--
作者：
L. R. Allen;I. Hume
描述了准确测定小型食粮鸟的维持氮需求（MNR）的程序。当与斑胸草雀 (Taeniopygia guttata) 一起使用时，它产生的 MNR 为 403 mg kgW−0.75 d−1。这比迄今为止测量的大多数其他雀形目动物要低，并且与一些非雀形目动物物种更相似。类似地，估计斑胸草雀的内源氮损失值（153 mg kgW−0.75 d−1）低于一般雀形目动物的内源氮损失值，但高于非雀形目动物的值。我们认为，严格吃草的斑胸草雀的低 MNR 主要是对种子饮食的适应，其中优质蛋白质是一个限制因素。与文献中报告的更广泛物种的比较受到限制，因为在许多情况下使用不适当的方法来估计 MNR，包括使用生长或繁殖的鸟类以及维持体重必然与维持零氮平衡一致的假设。
A procedure is described for the accurate determination of the maintenance nitrogen requirement (MNR) of small granivorous birds. When used with the zebra finch (Taeniopygia guttata), it yielded a MNR of 403 mg kgW−0.75 d−1. This is lower than most other passerines so far measured and more similar to some nonpasserine species. Similarly, the value for endogenous nitrogen loss estimated for the zebra finch (153 mg kgW−0.75 d−1) is less than that for passerines in general but higher than the nonpasserine value. We suggest that the low MNR of the strictly granivorous zebra finch is primarily an adaptation to seed diets in which high‐quality protein is a limiting factor. Comparison with a wider range of species reported in the literature was restricted because inappropriate methods have been used to estimate MNR in many cases, including the use of growing or reproducing birds and the assumption that maintenance of body mass necessarily coincides with maintenance of zero nitrogen balance.