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Heshani Amalka Vithana,Shemil Priyan Macelline,Shan Randima Nawarathna,Dinesh Darshaka Jayasena,유명환,서은수,Mangala Amarsinghe,Maleeka Nadeemale Nambapana,Jin Ho Cho,허정민 한국가금학회 2023 韓國家禽學會誌 Vol.50 No.1
The objective of this study was to investigate the effect of exogenous protease supplementation in dietsformulated with poultry by-product meal on growth performance, small intestine magnitudes, and meat physiochemicalcharacters in broiler chickens from 21 to 35 days post-hatch. A total of 120, one-day-old "Arbor Acres Plus" broiler chickens(male: female - 50:50) were allocated one of two dietary treatments to give six replicates and ten birds per cage. Two dietarytreatments included a control diet (CON) and a diet supplemented with protease (CON+Pro). At day 35, body weight andfeed intakes were measured to calculate the feed conversion ratio for the entire experiment period. Two birds from each penwere euthanized to measure the relative lengths and relative weights of three small intestine sections and meat samples werecollected for physiochemical characteristic analyses at 35 days post-hatch. Exogenous protease supplementation did notinfluence (P>0.05) growth performance but showed a tendency to improve FCR (P=0.082). Protease supplementation showed a tendency to reduce proximal small intestine length (P=0.091). Broilers offered dietary treatments influenced minced meatcolor where protease supplementation resulted in lower CIE b* (P<0.001) colorimetric value for yellowness and showed a significant trend (P=0.059) on reducing meat redness CIE a*. In conclusion, the addition of exogenous protease to a broilerdiet formulated with poultry by-product meal did not affect the growth performance, small intestine magnitudes, and meatphysiochemical parameters (except CIE b*) in broiler chickens.
Geerththana Vinothsankar,Shemil Priyan Macelline,Samiru Sudharaka Wickramasuriy,Shan Randima Nawarathna,Li Ang,Himali Tharangani,Dinesh Darshaka Jayasena,Jung Min Heo 한국가금학회 2020 韓國家禽學會誌 Vol.47 No.2
This study intended to investigate the growth performance and meat quality traits in broilers fed different regimens of NaCl over a period of 35 days. Seven hundred and fifty 1-day-old chicks (Cobb 500) were randomly assigned to five NaCl feeding regimens to obtain three replicates for each regimen. Broilers in CON group were provided with concentrations of 0.35% NaCl for the duration of the experimental period. The other groups were provided with two concentrations of NaCl (0.45% and 0.55%) under two durations, namely: 1) 1∼28 d: 0.45% or 0.55% NaCl for 28 days then CON; and 2) 1∼35 d: 0.45% or 0.55% NaCl for 35 days. Broilers fed 0.55% NaCl for 1∼35 d showed improved (P<0.05) growth performance compared with broilers fed the CON regimen. Moreover, higher water holding capacity of breast meat was shown by the broilers fed 0.55% NaCl for 1∼28 d when compared with that in broilers fed the CON diet (P<0.05). Broilers fed 0.45% NaCl showed an increase (P<0.05) in the lightness of the meat over CON diet and the 0.55% NaCl diet. In addition, broilers offered CON had the highest redness value and highest crude ash content in the breast meat (P<0.05). Feeding 0.45% NaCl for 1∼35 d and 0.55% NaCl for 1∼28 d resulted in a higher (P<0.05) protein content in breast meat. In conclusion, broilers fed diets with 0.55% NaCl for 1∼35 d showed improved growth performance as well as water holding capacity and protein content of the breast meat.