Publications (3)3.82 Total impact
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Article: Effects of phenyllactic acid on growth performance, nutrient digestibility, microbial shedding, and blood profile in pigs.
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ABSTRACT: Ninety weanling pigs in Exp. 1 (6.27 +/- 0.73 kg; 21 d of age) and 96 growing pigs in Exp. 2 (21.73 kg +/- 1.29 kg; 56 d of age) were used in two 42-d experiments to evaluate the effect of phenyllactic acid (PLA) on growth performance, apparent total tract digestibility (ATTD) of DM and N, fecal pH value, microbial shedding, and blood profiles. In Exp. 1, the 3 dietary treatments were 1) negative control (NC), 2) positive control (PC), NC + antibiotics, and 3) PLA, NC + 0.5% PLA. In Exp. 2, dietary treatments were 1) control diet (CON), 2) PLA-0.1, CON + 0.1% PLA, 3) PLA-0.2, CON + 0.2% PLA, and 4) PLA-0.3, CON + 0.3% PLA. In Exp. 1, pigs fed the PC and PLA diets had greater ADFI during the overall period (P < 0.05) and tended to have greater ADG and G:F from d 7 to 21 (P < 0.10) than those fed the NC diet. The ATTD of DM was greatest in pigs fed the PLA diet on d 20 and 41, and N digestibility on d 20 was greater in pigs fed the PLA diet (P < 0.05) than those fed the NC diet. The numbers of white blood cell and lymphocyte concentrations on d 42 were increased (P < 0.05) by the inclusion of antibiotics and PLA in the diet. In Exp. 2, G:F tended to increase when PLA was added (quadratic, P < 0.10). The ATTD of DM did not differ among treatments, but there was a tendency (quadratic, P < 0.10) for N digestibility to increase as PLA levels increased. The lymphocyte percentage on d 42 increased linearly as dietary PLA increased (P < 0.05). Additionally, the white blood cell counts on d 42 tended to increase as PLA levels increased (P < 0.10). In both experiments, there was no effect of treatment on the fecal pH or presence of Lactobacillus, but the number of Escherichia coli in feces on d 41 decreased in response to the addition of PLA [P < 0.05 and 0.001 (linear) in Exp. 1 and 2, respectively]. In conclusion, PLA can decrease the number of E. coli, and this novel dietary acid may have potential to stimulate the immune system for both weanling and growing pigs. Thus, it could be a good candidate as an alternative to antibiotics in pig diets.Journal of Animal Science 06/2009; 87(10):3235-43. · 2.10 Impact Factor -
Article: Effects of chitooligosaccharide supplementation on performance, blood characteristics, relative organ weight, and meat quality in broiler chickens.
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ABSTRACT: This study was conducted to evaluate the effects of dietary supplementation with chitooligosaccharide (COS) on growth performance, blood characteristics, relative organ weight, and meat quality in broilers. A total of 480 broilers with an average initial BW of 45.04 g per chick were randomly allocated into 1 of the following 4 dietary treatments (20 broilers per pen with 6 pens per treatment): 1) CON (basal diet), 2) ANT (basal diet + 44 mg/kg of avilamycin), 3) COS0.2 (basal diet + 14 g/kg of COS), 4) COS0.4 (basal diet + 28 g/kg of COS). The experiment lasted for 5 wk and avilamycin was administered from d 0 to 21. Growth performance was measured on d 0, 21, and 35, and all other response criteria were measured on d 35. No change in feed conversion (G:F) was observed in response to any of the treatments throughout the experimental period (P > 0.05). However, BW gain and feed intake were greater (P < 0.05) in broilers provided with feed supplemented with COS than in those in the control group. In addition, broilers had significantly greater (P < 0.05) red blood cell and high-density lipoprotein cholesterol concentrations when they were provided with the COS0.4 diet, whereas the triglyceride concentration was lower (P < 0.05) in broilers in the COS0.2 treatment group. No other blood characteristics were affected by the treatments. Additionally, as the dietary COS concentration increased, the liver weight increased (P < 0.05). Conversely, as the concentrations of dietary COS increased, abdominal fat decreased (P < 0.05). Furthermore, meat yellowness decreased (P < 0.05) as the concentration of COS increased. Finally, the breast meat and abdominal fat of birds provided with feed supplemented with COS had a lower (P < 0.05) saturated fatty acid concentration but a greater concentration of total monounsaturated fatty acids (P < 0.05) than that of birds in the control. In conclusion, COS can improve the performance and breast meat quality of broilers while increasing the red blood cell and high-density lipoprotein cholesterol concentrations in blood. In addition, COS can induce a decrease in abdominal fat and improve meat quality.Poultry Science 03/2009; 88(3):593-600. · 1.73 Impact Factor -
Article: Effect of dietary soyabean hulls and metal-amino acid chelated mineral supplementation on growth performance, nutrient digestibility and noxious gas emission in growing pigs
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ABSTRACT: A 2 × 2 factorial design Experiment 1 was conducted in order to characterize the effects of soyabean hulls (control or soyabean hulls diet) and metal-amino acid chelated minerals (MAC) (sulphate or MAC) on growth performance and nutrient digestibility in growing pigs. Forty eight pigs with the initial body weight (BW) 18.0 ± 1.1 kg were assigned on the basis of weight and sex to one of four treatments (2 pigs/pen, 6 replication pens/treatment, 6 barrows and 6 gilts/treatment). Throughout the experimental period, growth performance was not shown to be affected by dietary treatments. The coeffi cients of the total tract apparent digestibility of dry matter (DM) and nitrogen (N) remained unaffected by soyabean hulls diets or MAC supplementation. In Experiment 2, four barrows were used in a 4 × 4 Latin square design, to determine the effects of soyabean hulls and mineral types on emission of faeces and slurry noxious gas, including ammonia (NH3), hydrogen sulphide (H2S) and mercaptans (R.SH), in growing pigs. Faeces and urine grab samples were collected, and the faeces (300 g) and slurry (faeces + urine = 150 + 150 g) were mixed, stored, and fermented for 5 d in order to evaluate noxious gas emission. Pigs fed diets with soyabean hulls tended to have lower NH3 emission from faeces (P=0.09) than those fed the control diet, but NH3 emission from the slurry was not affected by soyabean hulls diet (P=0.12). No signifi cant effects on the faeces or slurry NH3 emission were exerted in MAC supplementation treatment. A signifi cant level of interaction between soyabean hulls and MAC was observed both in the faeces and slurry NH3 emission (P=0.05, P=0.01). Pigs fed diets with soyabean hulls tend to exhibit lower H2S emission from the slurry (P=0.07), but signifi cantly lower levels of H2S emission both from faeces and slurry (P=0.004, P=0.02) was observed when pigs were fed on MAC diets. The emission of R.SH from faeces signifi cantly decreased (P=0.02) in MAC supplementation treatments, but not from slurry, and no soyabean hulls effects or interaction were observed in relation to R.SH emission. *
Top Journals
Institutions
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2009
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Dankook University
- Department of Animal Resource & Science
Yŏng-dong, North Chungcheong, South Korea
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