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Se Yeon Chang,오한진,Jae Woo An,송동철,조현아,Sehyun Park,Kyeongho Jeon,Sang Hun Park,박윤환,Gyu Tae Park,Se Hyuk Oh,최나영,최정석,Jin Ho Cho 한국가금학회 2023 韓國家禽學會誌 Vol.50 No.1
This study was conducted to investigate the effect of vitamin E and nanoparticle-sized vitamin E (NVE) in a broiler diet on growth performance, blood profiles, and meat quality. A total of 45 one-day-old Arbor Acres broilers (initialbody weight of 37.00 ± 0.41 g) were used in this experiment for 28 days. All broilers were randomly allocated into threedietary treatments in a randomized complete block design. The dietary treatments were as follows: a basal diet (CON), a basaldiet supplementing with 380 mg/kg of vitamin E (T1), and a basal diet supplementing with 380 mg/kg of NVE (T2). Eachtreatment had five replicates with three birds per cage. On days 0-7, the T1 and T2 groups significantly increased (P<0.05)body weight gain compared to the CON group. Also, the T1 and T2 groups significantly increased (P<0.05) vitamin E contentin blood and breast meat compared to the CON group. In shearing force, the T2 group showed a lower tendency (P=0.070)than the CON group. The T1 group showed a higher tendency (P=0.086) in the b* (yellowness) value than the T2 group. On day 7 after the end of the experiment, the T2 group significantly decreased (P<0.05) TBA values compared to the CONgroup. In conclusion, supplementation with vitamin E or NVE can improve broiler growth performance in the starter period,reduce TBA value through the antioxidant action of vitamin E, prevent lipid oxidation, and improve shelf life.
Effects of different stocking density in lairage of fattening pigs in high temperatures
Dongcheol Song,Seyeon Chang,Jaewoo An,Sehyun Park,Kyeongho Jeon,Hyuck Kim,Jinho Cho 충남대학교 농업과학연구소 2023 Korean Journal of Agricultural Science Vol.50 No.4
Lairages serve several functions, such as providing post-mortal inspections and providing a reservoir of animals to ensure the slaughter line runs efficiently. High stress lairage conditions can contribute to the accumulation of transport stress in pigs, causing poor pork quality and still stressed pigs at slaughter. The objective of this study was to investigate meat quality, blood profile and behavior changes according to lairage stocking density in in high temperature. Density treatments were as follows: LD, low density (lower than 0.5 m2/100 kg); ND, normal density (0.5 m2/100 kg to 0.83 m2/100 kg); HD, high density (higher than 0.83 m2/100 kg). Air temperature treatment was as follows: HT, high temperature (higher than 24℃). Pigs stocked with LD showed lower pH, WHC (water holding capacity), and higher DL (drip loss) and CL (cooking loss) than those stocked with HD. Pigs stocked with LD showed lower cortisol level than those stocked with HD. Therefore, Pigs exposed to high stock density (lower than 0.5 m2/100 kg) in high air temperature during pre-slaughter caused acute stress and lead to PSE (pale, soft, exudative) pork incidence. Based on obtained results, stocking of too high (lower than 0.5 m2/100 kg) density is generally not good for meat quality and animal welfare at high temperatures.
Effect of black soldier fly larvae as substitutes for fishmeal in broiler diet
Se Yeon Chang,Min Ho Song,Ji Hwan Lee,오한진,송동철,Jae Woo An,조현아,Sehyun Park,Kyeongho Jeon,이병곤,Jeonghun Nam,Ji Yeon Chun,김현범,Jin Ho Cho 한국축산학회 2023 한국축산학회지 Vol.65 No.6
This study investigated the effect of processed forms (defatted or hydrolyzed) of black soldier fly larvae (Hermetia illucens L., BSFL) as a protein substitute on broilers. Experiment 1 was a feeding experiment, and Experiment 2 was a metabolism experiment. In Experiment 1, a total of 120 day-old Arbor Acres broilers (initial body weight 39.52 ± 0.24 g) were used for 28 days. There were 8 replicate pens, and 5 broilers were assigned to each pen. In Experiment 2, a total of 36 day-old broilers (initial body weight 39.49 ± 0.21 g) were used for the metabolism trial. There were 2 broilers in a metabolism cage and six replicate cages per treatment. The dietary treatments were as follows: a basal diet (CON), a basal diet without fishmeal and substitute with defatted BSFL (T1), a basal diet without fishmeal and a substitute with hydrolyzed BSFL (T2). In Experiment 1, during the entire experimental period, the T2 group significantly increased (p < 0.05) body weight gain and feed intake compared to the CON and T1 groups. The feed conversion ratio showed a lower tendency (p = 0.057) in the T2 group than in the CON and T1 groups. At 2 weeks, the CON and T2 groups were significantly higher (p < 0.05) crude protein (CP) digestibility than the T1 group. At 4 weeks, the total protein level significantly increased (p < 0.05) in the CON and T2 groups compared to the T1 group. In Experiment 2, the CP digestibility significantly increased (p < 0.05) in the T2 group compared to the CON and T1 group at weeks 2 and 4. At week 4 amino acid digestibility, the T2 group significantly increased (p < 0.05) lysine, methionine, tryptophan, and glycine digestibility compared to the T1 group. There was no difference in fecal microbiota among the treatment groups. In conclusion, feeding hydrolyzed BSFL as a fishmeal substitute in broiler diets improved growth performance, CP digestibility, and specific amino acid digestibility. Therefore, it is considered that hydrolyzed BSFL in broiler diets can be sufficiently used as a new protein source.