Effects Of Different Protein Diets Supplemented With Different Tryptophan Levels On Perfoemance And Serum Biochemical Assays For Piglets

Effects of different protein diets supplemented with different tryptophan levels on perfoemance and serum biochemical assays for piglets were studied. Experiment1:Effect of different tryptophan levels with different protein leves diets of piglets on the growth performance.Adopt2factor3levels orthogonal experiment design,144(Duroc X Landrace X Large white) healthy Piglets(7.8±0.5kg) were randomly allotted to9treatments by weight with two replicates per treatment and8pigs per replicate.Group1to3with a17%CP and three levels of tryptophan0.03%,0.06%,0.09, and group4to6with a19%CP and three levels of tryptophan0.03%,0.06%,0.09,and group7to9with a21%CP and three levels of tryptophan0.03%,0.06%,0.09;The results indicated:(1)The ADG of piglets were enhanced with the increase of tryptophan and protein when the diets with17%CP and21%CP(P<0.05). There were no significant differences when the diets with19%CP. The ADG of piglets were enhanced with the increase of dietary protein when the diets with0.22%and0.25%of tryptophan(P<0.05). When the diets with0.19%tryptophan, the ADG of the piglets in the groupl were significant differences with group4and7(P<0.05), but there were no significant differences between group4and7(P>0.05). The ADG of the piglet was biggest when the diets with21%CP and0.25%tryptophan(P<0.05).(2) The feed intaking of test piglets were no significant differences with different levels of CP and tryptophan(P>0.05).(3) The FBG of test piglets in group9was the lowest when the diet with21%CP and0.25%tryptophan(P<0.05).(4) The DM and the apparent digestion rate of energy of piglets in group5was the highest(P<0.05), and the apparent digestion rate of crude protein of piglets in group9was the highest(P<0.05), and the apparent digestion rate of crude fat of piglets in group3was the highest(P<0.05). Experiment2:Effects of protein diets supplemented with tryptophan on serum biochemical assays for Piglets.144(Duroc X Landrace X Large white)healthy Piglets(7.8±0.5kg) were randomly allotted to9treatments by weight with two replicates per treatment and8pigs per replicate. Group1to3with a17%CP and three levels of tryptophan0.03%,0.06%,0.09, and group4to6with a19%CP and three levels of tryptophan0.03%,0.06%,0.09,and group7to9with a21%CP and three levels of tryptophan0.03%,0.06%,0.09;The results indicated:(1) The content of5-HT in serum was decreased with increase of the dosage of tryptophan and levels of protein (P<0.05). The content of T4was increased with increase of tryptophan added and levels of protein (P<0.05). But there was no significant influence on INS and T3in serum of test piglets(P>0.05).(2) With the increase of tryptophan in diets, the SUN of test piglets was continuously decreased (P<0.05). With the increase of tryptophan added in the same dietary crude protein, the SUN in serum of piglets was the lowest when diet with19%CP and0.25%tryptophan(P<0.05), but there were no significant differences on the GOT and GPT (P>0.05).(3) The TG, CHO and LDL in serum of test piglets were decreased with increase of the dosage of tryptophan and levels of protein (P<0.05), but the HDL were increased (P<0.05).