Abstract
This study was designed to investigate the effects of dietary supplementation with N6, 2′-O-dibutyryl adenosine 3′,5′-cyclic monophosphate (dbcAMP) on growth performance, carcass traits, histochemical characteristics and serum constituents in finishing pigs. Seventy-two Duroc×(Landrace×Large White) barrows (57.3±0.6kg) were randomly allotted to 3 treatments with 6 replicate pens/treatment (4 pigs/pen). The pigs were fed diets containing 0, 10 and 20mgdbcAMP/kg, respectively, until the final slaughter weight of approximately 90kg. There were no differences in growth performance among dietary treatments. Leaf fat proportion and first rib backfat thickness were reduced (P<0.05), whereas tenth rib backfat thickness tended to decrease (P=0.10), in pigs fed 10mgdbcAMP/kg. Lean percentage was greater (P<0.05) and longissimus muscle area tended to increase (P=0.10) in pigs fed 10mgdbcAMP/kg when compared to the control group, but hot carcass weight was not affected by dbcAMP. Growth rate of fat-free lean tissues tended to increase (P=0.09) in dbcAMP-supplemented pigs. Dietary dbcAMP decreased (P<0.05) adipocytes diameter in subcutaneous fat, whereas longissimus muscle fiber diameter tended to increase (P=0.06) with dbcAMP supplementation; however, no difference in longissimus muscle cell density was detected among treatments. Serum concentrations of total protein and 3′,5′-cyclic adenosine monophosphate increased (P<0.05) in response to dbcAMP, but concentrations of triglycerides, total cholesterol, glucose and urea in serum did not differ among dietary treatments. These results indicate that dbcAMP had a positive effect on carcass traits. Addition of 10mgdbcAMP/kg to the diet was beneficial for growth performance and lean percentage, as well as improving protein and fat metabolism.
Published Version
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