The Effect Of Mixed Isoacids On Nutrient Digestion In Goats

The issue followed previous research, studied the effect of mixed isoacids in vivo on nutrient digestion in goats. Three Ma Cheng goats with an average body weight of (25.4±0.75)kg were fitted with permanent cannulas in the rumen, the proximal duodenum and terminal ileun, and allocated to three dietary treatments in a 3×3 Latin square design. Group I fed basal diet was control. Group II and III were fed 0.3% and 0.6% mixed isoacids(Na-salt) of experimental diet respectively. Test was staged 3,each pre-feeding 10 days, experiment lasted 8 days.The results were showed as follows:(1) The effect of mixed isoacids on rumen fermentation in goatsThe results showed that ruminal pH was not affected(P>0.05);Group II compared with control, the NH3-N concentrations reduction 14.12% (P<0.05), ruminal actate, butyrate and TVFA were increased by 1.01% (P<0.05),17.51% (P<0.01),18.97% (P<0.05);and butyrate was increased very significantly (P<0.01),the apparent disappearance and digestability of NDF from fore-stomach were increased by 33.55% (P<0.01)and 12.25% (P<0.01). Group III compared with control, the NH3-N concentrations was not significantly(P>0.05), ruminal actate, butyrate and TVFA were increased by 20.38% (P<0.05),15.14% (P<0.01),17.50 (P<0.05),the apparent digestability of NDF from fore-stomach was increased by 8.19% (P<0.05).(2) The effect of mixed isoacids on small intestine flows and apparent digestibility of amino acids in goats.Group II compared with control, the duodenum flows of Val and Ile were increased by 22.22%(P<0.05) and 17.06(P<0.05); the small intestine apparent digestibility of EAA, NEAA and TAA were increased by 3.08%( P>0.05), 1.66%(P>0.05) and 2.50%( P>0.05). Group III compared with control, the duodenum flows of Val, Ile, Leu and EAA were increased by 35.19% (P<0.01),34.35% (P<0.01),31.12% (P<0.05),18.28% (P<0.05); the small intestine apparent digestibility of Val and Ala were increased by 10.19% (P<0.05) and 15.00% (P<0.05); the small intestine apparent digestibility of EAA, NEAA and TAA were increased by 5.69%(P>0.05), 6.37%( P>0.05) and 5.99%( P>0.05)。(3)The effect of mixed isoacids on nutrient digestion and metabolism in goatsGroup II compared with control, the apparent digestibility of DM, OM and NDF with gastric area were increased by 3.32%(P>0.05), 1.78%(P>0.05) and 12.25%(P<0.01); the apparent digestibility of DM, OM and NDF with small intestine were increased by 32.19%(P<0.05), 47.17%(P<0.05) and 36.13%(P<0.05); the apparent digestibility of DM, OM and NDF with digestive tract were increased by15.18%(P<0.05),11.96%(P>0.05) and 17.00%(P>0.05). Group III compared with control, the apparent digestibility of DM, OM and NDF with gastric area were increased by 0.09%(P>0.05), 1.74%(P>0.05) and 8.19%(P<0.05); the apparent digestibility of DM, OM and NDF with small intestine were increased by 1.06%(P<0.05), 26.04%(P<0.05) and 25.35%(P<0.05); the apparent digestibility of DM, OM and NDF with digestive tract were increased by 8.73%(P>0.05), 6.31%(P>0.05) and 12.15%(P>0.05).In summary, mixed isoacids improved ruminal environment, the duodenum flows of AA, the apparent digestibility of nutrient with digestive tract of goats.