Effects of feed form and feed particle size with dietary L- threonine supplementation on performance, carcass characteristics and blood biochemical parameters of broiler chickens
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An experiment was conducted to evaluate the effect of form and particle size of feed supplemented with L- threonineon growth performance, carcass characteristic and blood biochemical parameters of broiler chickens. The experimentaldesign was a 2 × 2 × 2 factorial arrangement of treatments evaluating two feed forms (pellet or mash), two feed particlesizes (fine or course), and two inclusion rates of dietary L-threonine (with or without) which adopted from 7 to 42 daysof age. In this experiment, 360 a day old chicks in two sexes were assigned in each treatment and each experimentalunit was included 15 chicks. Feed consumption and weight gain were measured weekly. At 35 days of age, bloodsamples were taken to analysis blood biochemical parameters. At the end of the experimental period, two birds wereslaughtered in each treatment and carcass analysis was carried out. The results showed that the effect of feed form onbody weight gain and feed intake in whole of experimental period was significant (P < 0.05). Broilers fed pelleted dietshad more weight gain than the mash group. Growth performance parameters were not affected by feed particle sizeand dietary L-threonine supplementation in whole of experimental period (P > 0.05). The results of carcass analysisshowed that liver and gizzard relative weights were influenced by feed form (P < 0.05). However, pancreas and liverrelative weights were affected by feed particle size and dietary L-threonine supplementation, respectively (P < 0.05). Triglyceride and VLDL levels were affected by feed form and dietary L-threonine supplementation (P < 0.05). The effectof feed particle size on blood biochemical parameters was not significant (P > 0.05). In conclusion, the experimentalresults indicated that feed form increased feed consumption and weight gain in whole of experimental period(1 to 42 days of age) while feed particle size and dietary L-threonine had no effect on broiler performance.
Abstract
An experiment was conducted to evaluate the effect of form and particle size of feed supplemented with L- threonineon growth performance, carcass characteristic and blood biochemical parameters of broiler chickens. The experimentaldesign was a 2 × 2 × 2 factorial arrangement of treatments evaluating two feed forms (pellet or mash), two feed particlesizes (fine or course), and two inclusion rates of dietary L-threonine (with or without) which adopted from 7 to 42 daysof age. In this experiment, 360 a day old chicks in two sexes were assigned in each treatment and each experimentalunit was included 15 chicks. Feed consumption and weight gain were measured weekly. At 35 days of age, bloodsamples were taken to analysis blood biochemical parameters. At the end of the experimental period, two birds wereslaughtered in each treatment and carcass analysis was carried out. The results showed that the effect of feed form onbody weight gain and feed intake in whole of experimental period was significant (P < 0.05). Broilers fed pelleted dietshad more weight gain than the mash group. Growth performance parameters were not affected by feed particle sizeand dietary L-threonine supplementation in whole of experimental period (P > 0.05). The results of carcass analysisshowed that liver and gizzard relative weights were influenced by feed form (P < 0.05). However, pancreas and liverrelative weights were affected by feed particle size and dietary L-threonine supplementation, respectively (P < 0.05). Triglyceride and VLDL levels were affected by feed form and dietary L-threonine supplementation (P < 0.05). The effectof feed particle size on blood biochemical parameters was not significant (P > 0.05). In conclusion, the experimentalresults indicated that feed form increased feed consumption and weight gain in whole of experimental period(1 to 42 days of age) while feed particle size and dietary L-threonine had no effect on broiler performance.
참고문헌 (14)
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