Effects Of Fermented Soybean Meal As A Protein Source In Diets On Feeding Piglets

Microbio- fermented soybean meal is widely used in animal production for its decline in anti-nutritional factors,increase in small peptide and substantial improvement to the efficiency of animal protein utilization.Furthermore, its feeding effect in animal diet is gradually becoming the new focus,but which was limited to the strains and process.To select a specitic strain of fermented soybean meal that is suitable for application in animal production, related research was carried out in our lab, but the feeding effect is still in need of further studies.This study picks twenty four piglets( Duroc× Landrace× Yorkshire, 9.80±0.71 kg of body weight,28 d weaned) with good health and consistent genetic differences, which are to be slaughtered after a pro-feeding period of 7 days and a feeding period of 28 days. The piglets are randomly divided into four treatment groups with six repeats per group and one piglet per repeat. Four kinds of diets are divided into different groups, which are conventional corn-soybean-fish diet(Control group), factory FSM partly replacing diet(GroupⅠ,replacing 70% animal protein of the control group), lab FSM partly replacing diet(GroupⅡ, replacing 70% animal protein of the control group), and lab FSM wholly replacing diet(GroupⅢ,replacing 100% animal protein of the control group).By evaluating the growth performance index, the blood biochemical index, the digestion and metabolism index(total feces collection method), the protein and amino acid digestibility of digestive tract paragraphs(exogenous index method), and the acid soluble protein content,we find that the lab FSM diet has statistically significant effects on the replacement of animal protein,which provides a technical basis for the further exploration of feeding effects on piglet diets.The results are shown as the following:1、Fermented soybean meal(replacing animal protein in part) could improve the average daily gain and the daily feed intake, reduce the feed/gain ratio, increase total protein and albumin, and lower the serum urea nitrogen. Group Ⅱ is slightly better than GroupⅠ,but there is no significant difference(P > 0.05).2、The order of dry matter and crude protein apparent digestibility in each group is consistent.The sequence from high to low is Group Ⅱ,GroupⅠ, Control and Group Ⅲ. The highest nitrogen deposition and net protein utilization appear in GroupⅡ, slightly higher than that of Control and GroupⅠ, but no significant difference(P > 0.05) is found out.3 、 Digestibility of protein and AA in digestive tract paragraphs(front to back) is fundamentally on the rise,main absorbed in P-jejunum and ileum. In addition, Group Ⅱ has the biggest rise in protein digestibility between the A- jejunum and the M-jejunum and in AA digestibility between the M- jejunum and the P-jejunum.4、Acid-soluble protein content in each segment of the small intestine(front to back) shows a downward trend following the initial rise. Group Ⅱ reaches the peak in the M-jejunum and is significantly higher than Control and GroupⅠwith the value of 7.28%(P < 0.05) and 6.55%(P < 0.05) respectively, and has the biggest decline between the M- jejunum and the ileum. On the contrary, the trend for macromolecular protein content in GroupⅡhas the lowest result in P-jejunum. Compared with other groups, Group Ⅲ is on the highest side.In conclusion, it is shown that the animal protein diet could be partially(seventy percent) replaced by the fermented soybean meal that could be applied to animal diet.Our lab fermented soybean meal is also slightly better than the factory one in reducing the production cost and improving the profitability.However,whether a complete replacement and action mechanism is reliable is still in doubt.