1～21日龄爱拔益加×罗曼肉杂鸡饲粮代谢能、粗蛋白质、蛋氨酸和赖氨酸适宜水平研究

本试验旨在研究1~21日龄爱拔益加(AA)×罗曼肉杂鸡饲粮代谢能、粗蛋白质、蛋氨酸和赖氨酸的适宜水平。采用L_9(3~4)正交试验设计,饲粮代谢能水平分别为11.70、12.12、12.54 M J/kg;粗蛋白质水平分别为19.00%、20.00%、21.00%;蛋氨酸水平分别为0.45%、0.50%、0.55%;赖氨酸水平分别为1.00%、1.10%、1.20%。选取1日龄AA×罗曼肉杂鸡864只,随机分为9组,每组6个重复,每个重复16只,试验期21 d。通过饲养试验、屠宰试验等方法检测不同营养水平饲粮的饲喂效果。结果表明:1)饲粮粗蛋白质、蛋氨酸和赖氨酸水平对试验鸡平均日增重有显著影响(P0.05),21.00%粗蛋白质水平组显著高于20.00%粗蛋白质水平组(P0.05),0.50%蛋氨酸水平组显著高于0.55%蛋氨酸水平组(P0.05),1.20%赖氨酸水平组显著高于1.10%赖氨酸水平组(P0.05)。2)饲粮代谢能水平对21日龄试验鸡活体总能含量有显著影响(P0.05),12.12 MJ/kg代谢能水平组显著高于12.54 MJ/kg代谢能水平组(P0.05);饲粮蛋氨酸水平对试验鸡活体粗脂肪含量有显著影响(P0.05),0.50%和0.55%蛋氨酸水平组显著高于0.45%蛋氨酸水平组(P0.05)。3)饲粮代谢能和粗蛋白质水平对21日龄试验鸡活体能量沉积率有显著影响(P0.05),11.70和12.12 MJ/kg代谢能水平组显著高于12.54 MJ/kg代谢能水平组(P0.05),21.00%粗蛋白质水平组显著高于20.00%和19.00%粗蛋白质水平组(P0.05);1.10%赖氨酸水平组的试验鸡活体赖氨酸沉积率显著高于1.20%赖氨酸水平组(P0.05)。4)饲粮赖氨酸水平对试验鸡血清葡萄糖、尿酸、尿素氮水平有显著影响(P0.05),1.00%赖氨酸水平组血清葡萄糖水平最高,显著高于1.20%赖氨酸水平组(P0.05),1.10%赖氨酸水平组血清尿酸水平最高,显著高于1.20%赖氨酸水平组(P0.05),1.20%赖氨酸水平组血清尿素氮水平最高,显著高于1.10%赖氨酸水平组(P0.05)。5)由回归分析得出1~21日龄AA×罗曼肉杂鸡饲粮代谢能、粗蛋白质、蛋氨酸和赖氨酸适宜水平的计算公式分别为ME=45.33W~(0.75)+183.84△W,CP=19.77 W~(0.75)+626.47△W,Met=1.44 W~(0.75)+10.31△W,Lys=3.01 W~(0.75)+21.28△W(M E为代谢能,W~(0.75)为代谢体重,△W为平均日增重,CP为粗蛋白质,Met为蛋氨酸,Lys为赖氨酸),根据公式计算得出饲粮代谢能、粗蛋白质、蛋氨酸和赖氨酸的适宜水平分别为11.90 MJ/kg、21.08%、0.51%和1.05%。

Study on the Optimal Levels of Metabolic Energy,Crude Protein,Methionine and Lysine in Diets of Arbor Acres×Roman Hybrid Broilers Aged from 1 to 21 Days

The optimal levels of metabolic energy ( ME) , crude protein ( CP) , methionine ( Met) and lysine ( Lys) of Arbor Acres( AA) ×Roman hybrid broilers aged from 1 to 21 days were studied in this experiment. The L9(34)orthogonal experiment design was used, ME levels were 11.70, 12.12 and 12.54 MJ/kg, respec-tively, CP levels were 19.00%, 20.00%and 21.00%, respectively, Met levels were 0.45%, 0.50%and 0.55%, respectively, Lys levels were 1.0%, 1.1%and 1.20%, respectively.The broilers were randomly as-signed into 9 groups with 6 replicates per group and 16 broilers per replicate.The experiment lasted for 21 days.The feeding effects of diets with different nutrient levels were determined by feeding experiment, com-parative slaughter experiment and other methods.The results showed as follows:1) the levels of CP, Met and Lys in diets had significant effect on the average daily gain ( P<0.05) , which in 21.00%CP level group was significantly higher than that in 20.00%CP level group ( P<0.05) , in 0.50%Met level group was significantly higher than that in 0.55%Met level group ( P<0.05) , and in 1.20%Lys level group was significantly higher than that in 1.10%Lys level group ( P<0.05) .2) The ME level in diets had significant effect on the content of body total energy of 21-day-old broilers (P<0.05), which in 12.12 MJ/kg ME level group was significantly higher than that in 12.54 MJ/kg ME level group ( P<0.05) .The Met level in diets had significant effect on the content of body ether extract ( P<0.05) , which in 0.50%and 0.55%Met level groups was significantly higher than that in 0.45%Met level group ( P<0.05) .3) The levels of ME and CP in diets had significant effect on the body energy deposition rate of 21-day-old broilers, which in 11.70 and 12.12 MJ/kg ME level group was significantly higher than that in 12.54 MJ/kg ME level group ( P<0.05) , and in 21.00%CP level group was significantly higher than that in 20.00%and 19.00%CP level group ( P<0.05) .The body Lys deposition rate of 21-day-old broilers in 1.10%Lys level group was significantly higher than that in 1.20%Lys level group ( P<0.05) .4) The Lys level in diets had significant effects on the levels of glucose, uric acid and urea nitro-gen in serum of 21-day-old broilers ( P<0.05) , the glucose level in serum in 1.00%Lys level group was the highest, which was significantly higher than that in 1.20%Lys level group ( P<0.05) , the uric acid level in serum in 1.10%Lys level group was the highest, which was significantly higher than that in 1.20%Lys level group( P<0.05) , and the urea nitrogen level in 1.20%Lys level group was the highest, which was significant-ly higher than that in 1.10%Lys level group( P<0.05) .5) The regression analysis showed that the optimal level formulas of ME, CP, Met and Lys were ME=45.33W0.75+183.84△W, CP=19.77W0.75+626.47△W, Met=1.44W0.75+10.31△W, Lys=3.01W0.75+21.28△W ( ME was metabolic energy, W0.75 was metabolic weight, △W was average daily gain, CP was crude protein ,Met was methionine and Lys was lysine), re-spectively.According to the above formulas, the calculated optimal levels of ME, CP, Met and Lys of AA × Roman hybrid broilers aged from 1 to 21 days are 11.90 MJ/kg, 21.08%, 0.51%and 1.05%, respectively.