Digestive function in Australian magpie geese (Anseranas semipalmata)
Digestive function in Australian magpie geese (Anseranas semipalmata)
复制标题
澳大利亚喜鹊（Anseranas semipalmata）的消化功能
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
W. Dawson
中科院分区：
文献类型：
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作者：
T. Dawson;P. Whitehead;A. Mclean;F. Fanning;W. Dawson
澳大利亚鹊鹅（Anseranas semipalmata）不是真正的“鹅”，而是代表单型雁科的异常物种。它是草食性的，但其利用膳食纤维的能力是不确定的。我们研究了在代谢笼和野生鸟类中饲养天然饲料的驯服鸟类的消化过程。对肠道的大体解剖学检查显示，其特征与鸭科水禽、真正的鸭和鹅相似。在全收集饲养试验中，鹅被喂以未脱壳的稻谷或新鲜水草。水草纤维含量高（中性洗涤纤维（NDF）占干物质的74%），喜鹊鹅不能在这种饲料中维持能量或氮平衡。维持能量需求的笼养喜鹊鹅，估计对大米的饮食，是573千焦kg-1天-1，这是类似于其他物种的鹅。维持氮需要量为0.44gNkg-1/d或0.52gNkg-0.75d-1，与鸟类平均值相近。两种日粮的纤维消化量都很小，水稻和草分别占NDF的19%和27%。喜鹊鹅消化道中纤维性肠球菌的通过率随日粮的不同而不同。纤维的平均保留时间较长，当喂养的水草比未脱壳的粮食，7.7 - 3.0小时v.3.7 - 0.6小时的数据从野生喜鹊鹅澄清消化过程。沿着肠道的pH和短链脂肪酸沿着的模式指出，酸和酶消化发生在大部分的道，下至回盲部交界处。发酵似乎仅限于盲肠、直肠和泄殖腔，但值得注意的是，盲肠含有少量纤维，5%NDF。野鹅的纤维消化水平较高，但纤维仍然不是这些鸟类能量摄入的主要贡献者。在澳大利亚北方季风区，喜鹊鹅的消化能力被认为与它们对这些鹅的摄食和生殖生物学的影响有关
The Australian magpie goose (Anseranas semipalmata) is not really a ‘goose’ but an aberrant species representing the monotypic family Anseranatidae. It is herbivorous but its ability to utilise dietary fibre is uncertain. We examined digestive processes in tame birds fed natural forages in metabolism cages and in wild birds. An examination of the gross anatomy of the gut showed features similar to those in waterfowl of the family Anatidae, the true ducks and geese. In a total-collection feeding trial geese were fed either unhusked rice grain or fresh aquatic grass. The aquatic grass was high in fibre (neutral detergent fibre (NDF) was 74% of dry matter) and magpie geese could not maintain energy or nitrogen balance on this feed. The maintenance energy requirement of the caged magpie geese, as estimated on the rice diet, was 573 kJ kg–1 day–1, which was similar to that found for other species of geese. The maintenance nitrogen requirement was 0.44 g N kg–1 day–1 or 0.52 g N kg–0.75 day–1, which also was similar to the average value for birds. Fibre digestion on both diets was small, 19% and 27% of NDF for rice and grass respectively. Rates of passage of fibrous digesta through the gut of magpie geese varied with diet. The mean retention time for fibre was longer when feeding on the aquatic grass than on unhusked grain, 7.7 3.0 h v. 3.7 0.6 h Data from wild magpie geese clarified the process of digestion. The patterns of pH and short-chain fatty acids along the gut pointed to acid and enzymic digestion occurring in most of the tract, down to the ileocaecal junction. Fermentation appeared restricted to the caeca, rectum and cloaca, though, of note, the caeca contained little fibre, 5% NDF. Higher levels of fibre digestion were indicated in wild geese but fibre still was not a major contributor to the energy intake of these birds. The digestive capabilities of the magpie geese were considered in relation to their impact on the feeding and reproductive biology of these ‘geese’ in monsoonal, northern Australia
DOI：
10.1002/jez.1402520519
发表时间：
1989
期刊：
The Journal of experimental zoology. Supplement : published under auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry
影响因子：
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作者：
Obst,BS;Diamond,JM
通讯作者：
Diamond,JM