Effects of Supplemental Bromelain on Egg Production and Quality, Serum and Liver Traits of Laying Hens
Journal Title: Journal of Animal Science Advances - Year 2012, Vol 2, Issue 4
Abstract
This study evaluated the effects of bromelain supplementation on the egg production and quality, and serum and liver traits in laying hens. Sixty 75-week-old white Leghorn hens were used in this study, birds were randomly assigned to a control (basal diet), low-dose bromelain supplemental group (0.14g/kg feed; 250 U/kg feed) and high-dose bromelain supplemental group (0.28g/kg feed; 500 U/kg feed). Study period was 45 days. Experimental results indicated that bromelain supplementation no effects on feed intake, egg production, egg weight, feed/egg and yolk cholesterol (P>0.05). Eggshell thickness increased in the high-dose bromelain group (P<0.05). Liver cholesterol levels were dose-dependently and significantly reduced in both bromelain supplementation groups (P<0.05); Serum cholesterol levels were reduced in the high-dose bromelain group (P<0.05). Liver glutamate pyruvate transaminase (GPT) activity in the high-dose bromelain group was markedly lower than that in the control group (P<0.05). Serum total protein, total globulin and IgG levels in both bromelain supplementation groups were significantly increased compared with those in the control group (P<0.05). Percentage concentration of high-density lipoprotein (HDL) was enhanced in both bromelain supplementation groups, whereas, very low-density+low-density lipoprotein (VLDL+LDL) percentage was decreased compared with that in the control group (P<0.05). This study indicated that bromelain supplemented to diet of old laying hens displayed beneficial to maintain bird health.
Authors and Affiliations
Lien T. F. , Cheng Y. H. , Wu C. P
Keywords
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