Comparison Of Metabolizable Energy Of Feedstuffs For Cockerel And Gander And Study Of Sample Size On Determination Of Metabolizable Energy For Goose

The experiment was conducted to compare metabolizable energy values of feedstuffs for gander and cockerel and study the suitable sample size for determination of metabolizable energy for geese.Experiment one:Comparison of metabolizable energy values of feedstuffs for cockerel and geese. In this experiment,10adult Yangzhou ganders with weight(3.76±0.23) kg and10adult New Yangzhou cockerels with weight(2.57±0.17) kg were employed to determine metabolizable energy of4feedstuffs, including corn, soybean meal, paddy and wheat bran. Every5ganders and5cockerels were used to determine one feedstuff. The results indicate:①Apparent metabolizable energy (AME) of corn and soybean meal for gander were similar with those for cockerel (P>0.05), whereas true metabolizable energy (TME) of corn and soybean meal for gander were significantly lower than those for cockerel (P＜0.05, P＜.01,).The AME of paddy and wheat bran for gander were higher compared with those for cockerel (P＜0.01). There were no significant differences between the two species in TME of paddy and wheat bran (P>0.05).②he EEL of gander was slightly higher than that of cockerel when the birds were fed on soybean meal. However, the EEL of gander were significantly higher than those of cockerel when using feedstuffs except soybean meal (P<0.05, p＜0.01).③The digestibility of CF, ADF, NDF of corn,soybean meal and wheat bran for gander was higher than cockerel(p<0.05,p<0.01). As for the digestibility of ADF for paddy was also higher than cockerel(P<0.01). however there was no significant differences between the two species in digestibility of CF and NDF for paddy (P>0.05). It is concluded from the study that not all ME values of feedstuffs for geese were consistent with those for cockerel. The ME of some feedstuffs were similar between the two species, however, the others were different. It is more effective that goose get energy from feed fiber than chicken. The EEL of geese was higher than that of cockerel, Metabolic of Endogenous energy for the two species is different. The determination of AME for gander affected by endogenous energy is less than cockerel. Experiment two:The effect of sample size on determination of metabolizable energy was researched. In this experiment,12yangzhou gander were employed to determine metabolizable energy for corn. We selected certain number (3,4.5,6…8) metabolizable energy values from12metabolizable energy values randomly. Metabolizable energy values of each sample group were compared in the same sample size.They were also compared with the mean of12metabolizable energy value. The results indicate:The sample size of3or4is not acceptable.