Effects of fasting and excreta collection period on the apparent and true metabolizable energy of corn and dehydrated alfalfa meal in ganders

文献类型： 外文期刊

第一作者： Wang, Z. Y.

作者： Wang, Z. Y.;Shi, S. R.;Yang, H. M.;Sheng, D. F.;Lu, J.;Li, W. Z.;Shi, S. R.

作者机构：

关键词： Geese;metabolisable energy;fasting period;excreta collection period

期刊名称：ARCHIV FUR GEFLUGELKUNDE （ 影响因子：0.487； 五年影响因子：0.488 ）

ISSN： 0003-9098

年卷期： 2010 年 74 卷 2 期

页码：

收录情况： SCI

摘要： Experiments were conducted to determine the optimal fasting and excreta collection period of true metabolisable energy (TME) assay in geese. Twenty-four ganders, 25 weeks old, were divided into four groups by the body weight, six ganders in each group. Three groups were randomly selected and assigned to the different fasting periods (24, 32, 40 hrs) as the experimental groups, and the fourth group assigned as the control group (no feed intake with 40 hrs fasting period) was used to determine the endogenous energy losses. The excreta from all groups were collected at 16, 24, 32, 40 and 48 hrs after tube-feeding, and the excreta collected from control group at the same time point was used as the endogenous energy losses to correct apparent metabolisable energy (AME) to TME. Excreta dry matter (DM), DM digestibility, AME and TME of 85 g corn and 60 g dehydrated alfalfa meal (DAM) were determined in experiment 1 and 2, respectively. Results showed that: DM excreta collected at 0-16 hrs time period after tube-feeding was higher than that in later periods (P< 0.05) in both experiments. Excreta DM decreased, while DM digestibility, AME and TME of corn increased as the increasing of fasting period after tube-feeding, However, no significant difference was observed among different fasting groups in each collection time period (P> 0.05). Excreta DM collected from 24 hrs fasting group was higher than that of 40 hrs fasting group in both experiments (P< 0.05). DM of corn and DAM in different procedures were 72.8-85.0% and 13.9-28.8% respectively. AME and TME of corn in different procedures were 11.6-13.5 MJ/kg and 12.8-14.0 MJ/kg respectively, while these of DAM were 3.22-4.84 MJ/kg and 4.82-5.49 MJ/kg respectively. In each fasting period of both experiments, excreta DM increased as collection period increased after tube-feeding, while DM digestibility, AME and TME decreased. In corn experiment, excreta DM of 16 h collection period was lower than those of the later collection periods (32 h, 40 h and 48 h) (P< 0.05), while DM digestibility and AME of 16 h collection period were higher than those of the later collection periods (P< 0.05). In DAM experiment, no difference was detected in excreta DM among all excreta collection periods (P> 0.05). DM digestibility and AME of 16 h collection period were higher than those of other collection periods (P< 0.05). It was concluded that the optimal fasting and excreta collection period of TME bioassay should be "24 + 24 h" in geese.

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