Studies On Metabolizable Energy And Amino Acids For Some Common Feedstuffs In Musovy And Shaoxing Ducks

The objective of the present experiment was to demonstrate if it was scientific to use chick' data for ducks' diets, and provide new information on AME, TME, apparent amino acid digestibility (AAAD) and true amino acid digestibility (TAAD) of soybean meal(SBM), peanut meal(PNM), wheat, corn and fish meal(FM) for ducks. Three 5×5 Latin square design used to evaluate the energy and amino acid availability of several common feedstuffs for Shaoxing ducks , Muscovy ducks and laying cocks. According to the 5X 5 Latin square design table, five Shaoxing ducks (or five Muscovy ducks or five laying cocks )were selected and fed SBM, PNM, wheat, FM and com each term. For the first one term , all the birds were fasted 48h, then collected excreta for 48h, which was used to measure endogenous amino acid. For other five terms, each bird was force-fed one of the above feedstuffs after fasted 48h, then collected 48h excreta ,FM 30g each time ,the others 50g each time. The recovery time between terms was 10 days. The whole experiment was 74 days.The metabolizable energy(AME and TME) of PNM was higher(P<0.05) than other feedstuffs in Shaoxing ducks and Musovy ducks, The difference among wheat, FM ,corn and SBM in the metabolizable energy(AME and TME) were not significant(P>0.05) in Shaoxing ducks. The metabolizable energy(AME and TME) of FM in Muscovy ducks is lower than other feedstuffs and the difference among wheat, SBM and corn were not significant(P>0.05) .Shaoxing ducks' AME.TME of SBM, FM and corn were higher (P<0.05) than cocks'; AME, TME of wheat was lower (P<0.05) than cocks'; AME.TME of PNM did not differ (p>.05)from cocks'; Muscory ducks' TME of SBM, wheat and corn were higher (P<0.05 or P<0.01 ) than cock', TME of PNM and FM didnot differ (P>.05) from cocks' and AME was higher(P<0.05). AME, TME of FM was higher (P<0.05) than Muscory ducks' and those of wheat, corn were lower (P<0.05)than Muscory ducks', AME, TME of SBM, PNM did not differ (P<0.05) with Muscory ducks'. Results of correlation analysis revealed that there was a strong correlation(P<0.05) not only between AME and TME of cocks but also between ducks and cocks in digestibility energy(AME and TME).Shaoxing ducks mean AAAD.TAAD of SBM ,corn were higher than cocks' (P<0.05), PNM ,FM and wheat did not differ (P>.05)from cocks'; Muscory ducks' mean TAAD of SBM, wheat, corn were higher (P<0.05)than cocks'; AAAD , and TAAD of PNM was lower (P<0.05) than cocks'; TAAD of FM didn't differ(P>.05) from cocks'.AAAD and TAAD of Shaoxing ducks in PNM was higher (P<0.05) than Muscory ducks';in wheat was lower than (P<0.05) Muscory ducks', in SBM, FM and corn didn't differ(P>.05) from Muscory ducks'.The results indicated that there were significant differences between ducks and cocks, Shaoxing ducks and Muscory ducks in the metabolizable energy and amino acid digestibility of feedstuffs. These results of this study establish reliable data for formulating of duck diets using the tested feedstuffs.