Increasing dietary lysine increases final pH and decreases drip loss of broiler breast meat
Increasing dietary lysine increases final pH and decreases drip loss of broiler breast meat
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DOI：
10.3382/ps.2007-00226
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发表时间：
2008-03-01
期刊：
影响因子：
4.4
通讯作者：
Relandeau, C.
中科院分区：
文献类型：
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作者：
Berri, C.;Besnard, J.;Relandeau, C.
对1,584只21~42日龄的罗斯308公鸡按2种饲养密度进行了赖氨酸水平升高的反应评价。试验设计由8个因素组成：2个饲养密度(22或44只肉鸡/1.7m(2)栏)×4个真可消化(TD)赖氨酸水平(0.83、0.93、1.03和1.13%)。每次治疗重复6次。在第21天和第42天分别称重。每栏记录饲料消耗量。在试验期内计算增重和饲料转化率。每个处理48只肉鸡在42日龄时被解剖。在胸大肌上测量最终的pH值和储存过程中的滴漏损失。密度对采食量(每栏22只和44只)、生长速度(97.4+/-0.5g/d和91.0+/-0.7g/d)和饲料转化率(1.730+/-0.008和1.760+/-0.006，P<；0.05)均有不利影响。除采食量外，鸟群密度和饲粮赖氨酸之间没有交互作用。日粮中添加Td Lys从0.83%提高到0.93%，可提高生长速度(从91.8+/-1.6g/d提高到95.5+/-0.8g/d，P<；0.05)，提高饲料转化率(从1.783+/-0.008提高到1.742+/-0.009，P<；0.05)，并提高胸肉产量(22.0+/-0.1%到22.7+/-0.2%，P<；0.01)。当TD-Lys浓度高于0.93%时，仔猪的生产性能和体成分指标没有显著改善。然而，最终乳房pH值从0.83上升到1.03%Td Lys(6.02+/-0.01 vs.5.91+/-0.01，P<；0.05)，滴水损失相对减少(0.85+/-0.03%vs.1.10+/-0.06，P<；0.05)。这一结果为氨基酸需求的定义和胸肌pH变化所涉及的代谢途径开辟了新的研究途径。
Responses to increased dietary Lys concentrations were evaluated on 1,584 Ross 308 male broilers between 21 and 42 d of age housed according to 2 bird densities. The experimental design was composed of 8 factorial treatments: 2 bird densities (22 or 44 broilers/1.7 m(2) pen) x 4 true digestible (TD) Lys levels (0.83, 0.93, 1.03, and 1.13%). There were 6 repetitions per treatment. Birds were weighed individually at d 21 and 42. Feed consumption was recorded per pen. Body weight gain and feed conversion were calculated over the experimental period. Forty-eight broilers per treatment were dissected at 42 d of age. Final pH and drip loss during storage were measured on the pectoralis major. Density adversely affected feed intake (169 +/- 1 and 160 +/- 1 g/d with 22 and 44 birds per pen, respectively, P < 0.05), growth rate (97.4 +/- 0.5 and 91.0 +/- 0.7 g/d, P < 0.05), and feed conversion (1.730 +/- 0.008 and 1.760 +/- 0.006, P < 0.05). Except for feed intake, there was no interaction between the effects of bird density and dietary Lys. An increase in dietary TD Lys from 0.83 to 0.93% resulted in an increased growth rate (from 91.8 +/- 1.6 to 95.5 +/- 0.8 g/d, P < 0.05), improved feed conversion (from 1.783 +/- 0.008 to 1.742 +/- 0.009, P < 0.05), and increased breast meat yield (22.0 +/- 0.1% to 22.7 +/- 0.2%, P < 0.01). Performance and body composition traits were not significantly improved for concentrations of TD Lys higher than 0.93%. However, final breast pH increased from 0.83 up to 1.03% TD Lys in the diet (6.02 +/- 0.01 vs. 5.91 +/- 0.01, P < 0.05), and drip loss correlatively decreased (0.85 +/- 0.03% vs. 1.10 +/- 0.06, P < 0.05). This result opens new way of research for the definition of an amino acid requirement and on metabolic pathways involved in variations of breast muscle pH.