Studies On The Effects Of Dietary Antistress Additives Complex Supplementation On Antistress Of Pigs Under Domestic Settings

Studies were conducted to evaluate the effects of antistress additives complex supplementation in pigs on performance, serum biochemical parameters and immune function of weaned piglets under domestic settings.Sixteen sows(LandracexLarge White) were randomly assigned to four treatments with four replicates in summer. Twelve sows were randomly assigned to three treatments with four replicates in winter. Feed and water were provided ad libitum during the entire experimental period. All sows were fed corn-soybean meal basic diets. Treatments were as follows: (1)controlled basic diets); (2) each piglet fed dietary supplemented antistress additives complex (for short: antistressers) I 2g/d ; Sows fed basic diets;(3)each sow fed dietary supplemented antistressers 110g/d and each piglet fed dietary supplemented antistressers I 2g/d;(4)each piglet fed dietary supplemented antistressers II0.1g/d (only in summer). Blood samples were collected from antechamber vein at 8:00 on the day of weaning, the 4th day and the 14th day of postweaning. The serum enzyme activities (AKP, LDH, GPT, GOT), the concentration of serum total protein, albumin, globulin, Na+, K+, Ca++, P, the ratio of G/A, the content of CO2 and HCO3, blood physiological indices and T lymphocyte proliferation ratio were measured.The results showed that:(1) Compared with the control group, the trial groups had no significant improvement on sows bred performance(P>0.05),but higher than the control group; dietary antistressers I supplementation in sows and piglets, the average daily feed intake was higher than the others. (2) In the trial, dietary antistressers supplementation had significant improvement on average body weight, daily weight gain and FCR of weaned piglets (P<0.05); but there had no significant improvement on feed intake of weaned piglets relative to the control (P>0.05). (3) Dietary antistressers I supplementation in sows and piglets significantly increased the activities of AKP and LDH(P<0.01); numerically decreased the activities of GPT and GOT(P<0.05). Moreover, the activity of AKP in summer was significantly lower than that in winter; however, the activities of GPT and GOT in summer were significantlyhigher than those in winter (P<0.01). (4)There were not significantly different in serum mineral concentration of weaned piglets among treatments (P>0.05). But antistressers supplementation can maintain the electrolyte balance. (5) Dietary antistressers I supplementation in sows and piglets significantly increased the contend of TP,GLOB and the ratio of G/A in summer (P<0.05);numerically increased the concentration of CO2 and HCO3- (P<0.05). Compared with the control group, the trial groups had significantly increased on T lymphocyte proliferation ratio (P<0.01).Seen from the above results, we can have the conclusions: 1)Dietary antistressers supplementation show significantly better effects on antistress. It can significantly increase the pigs performance and numerically improve the piglets immune function. 2)The effects of antistressers supplementation are better in summer than that in winter because the stressors intensity are higher in summer than that in winter. 3)The effect of dietary antistressers supplementation in sows and piglets are better than that of dietary antistressers supplementation only in weaned piglets. 4)The effects of antistress additives complex I are better than II.