Effects Of The Dietary Supplementation With L-carnitine And Betaine On Growth Performance, Carcass Quality And Serum Biochemistry Indices In Finishing Pigs

A3×3(L-camitine×betaine)mulitiple-factor experiment has been conducted to explore the effects of the dietary supplementation with L-carnitine and betaine on growth performance, carcass characteristics and meat quality,serum biochemistry indices of finishing pigs.81 finishing pigs(Duroc×Landrace×Yorkshire) with average weight of 90kg were randomly divided into 9 groups,each treatment including 3 replicates(3 pigs per replicate),L-carnitine supplement amounts were 0,50,100 mg/kg,betaine supplement were 0,1000,1500 mg/kg.The results are showed as follows:1,L-carnitine and betaine supplementation had significant effects on average daily gain and average daily feed intake(P＜0.05).But L-carnitine and betaine had no interaction effects on growth performance(P＞0.05).2,L-carnitine supplementation had significant effects on fatback thickness and longissimus dorsi area(P＜0.05).Betaine supplementation had significant effect on fatback thickness(P＜0.05).The interaction of L-camitine and betaine had no significant effects on carcass characteristics(P＞0.05).3,L-camitine had significant effects on marbling score and muscle protein content (P＜0.05),Betaine had significant effects on meat color score and total muscle pigment (P＜0.05),L-carnitine and betaine had no significant effects on pH value of muscle,drop loss, cooking loss,shear force(P＞0.05).But L-camitine and betaine had no interaction effects on meat quality(P＞0.05).4,L-carnitine supplementation increased content of liver protein and depressed crude fat significantly(P＜0.05),But L-carnitine and betaine had no interaction effects on liver quality (P＞0.05).5,L-camitine supplementation depressed activities of glutamic-pyruvic transaminase and glutamic-oxalacetic transaminase,serum urea nitrogen,triglyceride significantly,total cholesterol significantly(P＜0.05),increased serum total protein and high density lipoprotein significantly(P＜0.05),betaine had significant effects on serum urea nitrogen(P＜0.01),and L-carnitine and betaine had interaction effects on triglyceride significantly(P＜0.05).In conclusion,L-camitine and betaine supplementation can increase the growth performance,carcass characteristics and meat quality,fat metabolism.And the optimum supplement level is L-camitine 100mg/kg and betaine 1500mg/kg.