Growth Performance, Carcass Characteristics, Nutrient Digestibility and Serum Biochemical Parameters of Broilers Fed Low-protein Diets Supplemented with Various Ratios of Threonine to Lysine원문보기
Gong, L.M.
(National Feed Engineering Technology Research Center, China Agricultural University)
,
Lai, C.H.
(National Feed Engineering Technology Research Center, China Agricultural University)
,
Qiao, Shiyan
(National Feed Engineering Technology Research Center, China Agricultural University)
,
Li, Defa
(National Feed Engineering Technology Research Center, China Agricultural University)
,
Ma, Y.X.
(National Feed Engineering Technology Research Center, China Agricultural University)
,
Liu, Y.L.
(National Feed Engineering Technology Research Center, China Agricultural University)
This study was conducted to evaluate performance, breast (thigh) muscle yield, nutrient digestibility and serum biochemical parameters of broilers fed low-protein diets supplemented with various threonine to lysine ratios (Thr/Lys). Three hundred and twenty four day-old male Arbor Acres broilers wer...
This study was conducted to evaluate performance, breast (thigh) muscle yield, nutrient digestibility and serum biochemical parameters of broilers fed low-protein diets supplemented with various threonine to lysine ratios (Thr/Lys). Three hundred and twenty four day-old male Arbor Acres broilers were randomly allotted to six dietary treatments with six replicates per treatment and nine broilers per replicate. Six treatments included one control diet [formulated according to NRC (1994)], and five experimental diets (treatments 1-5). In treatments 1-5, the crude protein level was 2% lower than that of the NRC control diet. The Thr/Lys in treatments 1-5 was 0.65, 0.70, 0.75, 0.80 and 0.85 during the starter and grower phases and 0.70, 0.75, 0.80, 0.85 and 0.90 during the finisher phase with other nutrient levels kept consistent. The results showed that: (1) With increasing Thr/Lys, ADG of treatments 1, 3 and 4 were lower (p<0.05) than those of the NRC control diet during the starter phase; ADG of treatments 1-5 were lower (p<0.05) than those of the NRC control during the grower phase, and ADG of treatment 1 was lower (p<0.05) than that of the NRC control during the finisher phase. Average daily feed intake in treatments 1 and 4 were lower (p<0.05) than that of broilers on the NRC control diet during the grower phase. Feed/gain (F/G) of the NRC control diet was lowest (p<0.05) during the starter phase. F/G in treatments 2 and 5 were higher (p<0.05) than that of NRC during the grower phase. (2) Breast muscle proportion on d 21 increased linearly (p<0.05) in response to graded levels of Thr/Lys. (3) No differences were detected for dry matter, energy and crude protein digestibility among all seven treatments. (4) On d 21, serum triglyceride of broilers on dietary treatments 3 and 5 was higher (p<0.05) than that of broilers in control. The results indicate that the low-protein diets supplemented with an appropriate Thr/Lys could not support the same performance that was achieved by the broilers fed the NRC control diet.
This study was conducted to evaluate performance, breast (thigh) muscle yield, nutrient digestibility and serum biochemical parameters of broilers fed low-protein diets supplemented with various threonine to lysine ratios (Thr/Lys). Three hundred and twenty four day-old male Arbor Acres broilers were randomly allotted to six dietary treatments with six replicates per treatment and nine broilers per replicate. Six treatments included one control diet [formulated according to NRC (1994)], and five experimental diets (treatments 1-5). In treatments 1-5, the crude protein level was 2% lower than that of the NRC control diet. The Thr/Lys in treatments 1-5 was 0.65, 0.70, 0.75, 0.80 and 0.85 during the starter and grower phases and 0.70, 0.75, 0.80, 0.85 and 0.90 during the finisher phase with other nutrient levels kept consistent. The results showed that: (1) With increasing Thr/Lys, ADG of treatments 1, 3 and 4 were lower (p<0.05) than those of the NRC control diet during the starter phase; ADG of treatments 1-5 were lower (p<0.05) than those of the NRC control during the grower phase, and ADG of treatment 1 was lower (p<0.05) than that of the NRC control during the finisher phase. Average daily feed intake in treatments 1 and 4 were lower (p<0.05) than that of broilers on the NRC control diet during the grower phase. Feed/gain (F/G) of the NRC control diet was lowest (p<0.05) during the starter phase. F/G in treatments 2 and 5 were higher (p<0.05) than that of NRC during the grower phase. (2) Breast muscle proportion on d 21 increased linearly (p<0.05) in response to graded levels of Thr/Lys. (3) No differences were detected for dry matter, energy and crude protein digestibility among all seven treatments. (4) On d 21, serum triglyceride of broilers on dietary treatments 3 and 5 was higher (p<0.05) than that of broilers in control. The results indicate that the low-protein diets supplemented with an appropriate Thr/Lys could not support the same performance that was achieved by the broilers fed the NRC control diet.
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제안 방법
At the end ofthe starter, grower and finisher phases, the broilers were individually weighed, and six broilers per treatment (one broiler per pen) were randomly selected and 5 ml of blood was drawn from the heart of the broilers in order to determine the serum biochemical parameters. Serum was separated by centrifugation (2,500xg for 15 min) and was stored at -80°C until analysis.
At the end ofthe starter, grower and finisher phases, the broilers were individually weighed, and six broilers per treatment (one broiler per pen) were randomly selected and 5 ml of blood was drawn from the heart of the broilers in order to determine the serum biochemical parameters. Serum was separated by centrifugation (2,500xg for 15 min) and was stored at -80°C until analysis.
The experiment was divided into three phases, including a starter (d 0-21), grower (d 22-42) and finisher (d 43-49) phase. Six dietary treatments included one control group and five experimental groups (treatments 1-5).
The experiment was divided into three phases, including a starter (d 0-21), grower (d 22-42) and finisher (d 43-49) phase. Six dietary treatments included one control group and five experimental groups (treatments 1-5).
대상 데이터
Standard Error ofthe Mean. Data are means ofsix replicate pens of nine birds within each replicate.
Standard Error ofthe Mean. Data are means ofsix replicate pens of nine birds within each replicate.
데이터처리
Data were analyzed as a randomized complete block design using the GLM procedure of SPSS 10.0 (Lu et al., 2000). If the difference among the seven treatments was significant, then Duncan’s Multiple Comparison test was used for post hoc multiple comparisons.
, 2000). If the difference among the seven treatments was significant, then Duncan’s Multiple Comparison test was used for post hoc multiple comparisons. Linear and quadratic regression analysis was used to determine the effects of increasing Thr/Lys in treatments 1-5.
이론/모형
Nutrient content in both the diets and excreta were analyzed according to AOAC (1995) procedures. Serum uric acid, cholesterol and triglyceride (CHOD-PAP method) were measured using a commercially available kit (Beijing Zhongsheng Biotech Company, Beijing, China).
성능/효과
Data from this present study demonstrate that performance and breast and thigh muscle yield may be improved with increasing the Thr/Lys in low-protein diets. In addition, the low-protein diets supplemented with an appropriate Thr/Lys was not able to support the same performance that was achieved by the broilers fed the control diet formulated according to NRC (1994) recommendations.
05). These results indicate that low-protein diets supplemented with an appropriate Thr/Lys could not support the same performance that was achieved by the broilers fed the control NRC diet, although the Thr/Lys in treatments 3-5 was higher than that in the NRC control diet.
후속연구
In addition, the low-protein diets supplemented with an appropriate Thr/Lys was not able to support the same performance that was achieved by the broilers fed the control diet formulated according to NRC (1994) recommendations. Further studies are needed to evaluate the appropriate Thr/Lys that meets the highest performance and carcass quality and the extent to which CP may be reduced such that the diets can support live performance equal to that of the high CP diets.
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