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Methane emissions of geese (Anser anser) and turkeys (Meleagris gallopavo) fed pelleted lucerne.
Comparative Biochemistry and Physiology A: Molecular & Integrative Physiology ( IF 2.3 ) Pub Date : 2020-01-07 , DOI: 10.1016/j.cbpa.2020.110651
Marcus Clauss 1 , Samuel Frei 1 , Jean-Michel Hatt 1 , Michael Kreuzer 2
Affiliation  

In contrast to mammalian herbivores, birds are generally perceived to produce little methane (CH4) during digestion, and accounting for poultry in greenhouse gas inventories is considered unnecessary. We measured CH4 emissions in six domestic geese (Anser anser, 5.0 ± 0.9 kg) and six domestic turkeys (Meleagris gallopavo, 6.3 ± 0.6 kg) kept on a diet of lucerne pellets only, using open-circuit chamber respirometry. Measurements of oxygen consumption were similar to previously published values in these species. Absolute CH4 emissions per day were lower in geese (0.58 ± 0.10 L) than in turkeys (1.48 ± 0.16 L) and represented 0.4 ± 0.2 and 0.6 ± 0.1% of gross energy intake, respectively. These results confirm previous findings on the presence of methanogenes in the digestive tract of poultry species, and in vitro measurements performed on poultry caecal contents. In relation to mammalian herbivores in terms of absolute CH4 emissions, CH4 yield per dry matter or gross energy intake, or the CH4:CO2 ratio, the lucerne-fed geese and turkeys had comparatively low values. The emission of CH4 in spite of the very short digesta retention times and low fibre digestibility, as measured in the same animals, gives rise to the hypothesis that that in some birds, caecal fermentation and the associated CH4 production may be related to the microbial digestion of uric acid. The hypothesis that CH4 emissions in poultry may depend not only on dietary fibre but also on dietary digestible protein (that is excreted as uric acid in urine and retrogradely transported from the cloaca into the caeca) remains to be tested.

中文翻译:

饲喂成粒的卢塞恩,鹅(Anser anser)和火鸡(Meleagris gallopavo)的甲烷排放量。

与哺乳动物食草动物相反,通常认为鸟类在消化过程中几乎不产生甲烷(CH4),因此认为无需在温室气体清单中考虑家禽。我们使用开路腔室呼吸测定法测量了六只只养有卢塞恩颗粒饮食的家养鹅(Anser anser,5.0±0.9千克)和六只家养火鸡(Meleagris gallopavo,6.3±0.6千克)的CH4排放。耗氧量的测量与这些物种以前公布的值相似。鹅的每日绝对CH4排放量(0.58±0.10 L)低于火鸡(1.48±0.16 L),分别占总能量摄入的0.4±0.2%和0.6±0.1%。这些结果证实了以前关于禽类消化道中产甲烷菌的发现,对家禽盲肠内容物进行体外测量。就哺乳动物的食草动物而言,就绝对CH4排放,每单位干物质的CH4产量或总能量摄入或CH4:CO2的比例而言,卢塞恩喂养的鹅和火鸡的价值相对较低。尽管在同一只动物中消化时间短且纤维消化率低,但仍排放CH4,这提出了一个假设,即在某些鸟类中,盲肠发酵和相关的CH4产生可能与微生物消化有关。尿酸。禽类中CH4的排放可能不仅取决于膳食纤维,而且取决于膳食可消化的蛋白质(尿液中以尿酸形式排泄,并从泄殖腔逆行转运至盲肠)的假说尚待检验。就哺乳动物的食草动物而言,从绝对CH4排放量,每干物质的CH4产量或总能量摄入或CH4:CO2的比例来看,卢塞恩喂养的鹅和火鸡的值相对较低。尽管在同一只动物中消化时间短且纤维消化率低,但仍排放CH4,这提出了一个假设,即在某些鸟类中,盲肠发酵和相关的CH4产生可能与微生物消化有关。尿酸。禽类中CH4的排放可能不仅取决于膳食纤维,而且取决于膳食可消化的蛋白质(尿液中以尿酸形式排泄,并从泄殖腔逆行转运至盲肠)的假说尚待检验。就哺乳动物的食草动物而言,就绝对CH4排放,每单位干物质的CH4产量或总能量摄入或CH4:CO2的比例而言,卢塞恩喂养的鹅和火鸡的价值相对较低。尽管在同一只动物中消化时间短且纤维消化率低,但仍排放CH4,这提出了一个假设,即在某些鸟类中,盲肠发酵和相关的CH4产生可能与微生物消化有关。尿酸。禽类中CH4的排放可能不仅取决于膳食纤维,而且取决于膳食可消化的蛋白质(尿液中以尿酸形式排泄,并从泄殖腔逆行转运至盲肠)的假说尚待检验。卢塞恩喂养的鹅和火鸡的价值相对较低。尽管在同一只动物中消化时间短且纤维消化率低,但仍排放CH4,这提出了一个假设,即在某些鸟类中,盲肠发酵和相关的CH4产生可能与微生物消化有关。尿酸。禽中CH4排放可能不仅取决于膳食纤维,而且还取决于膳食可消化蛋白质(尿液中尿酸作为尿酸排出,并从泄殖腔逆行运输至盲肠)的假说尚待检验。卢塞恩喂养的鹅和火鸡的价值相对较低。尽管在同一只动物中消化时间短且纤维消化率低,但仍排放CH4,这提出了一个假设,即在某些鸟类中,盲肠发酵和相关的CH4产生可能与微生物消化有关。尿酸。禽类中CH4的排放可能不仅取决于膳食纤维,而且取决于膳食可消化的蛋白质(尿液中以尿酸形式排泄,并从泄殖腔逆行转运至盲肠)的假说尚待检验。盲肠发酵和相关的CH4产生可能与尿酸的微生物消化有关。禽类中CH4的排放可能不仅取决于膳食纤维,而且取决于膳食可消化的蛋白质(尿液中以尿酸形式排泄,并从泄殖腔逆行转运至盲肠)的假说尚待检验。盲肠发酵和相关的CH4产生可能与尿酸的微生物消化有关。禽类中CH4的排放可能不仅取决于膳食纤维,而且取决于膳食可消化的蛋白质(尿液中以尿酸形式排泄,并从泄殖腔逆行转运至盲肠)的假说尚待检验。
更新日期:2020-01-07
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