本试验旨在研究饲粮不同含硫氨基酸(SAA)水平对育成期海兰灰蛋鸡生长发育及后续生长和产蛋性能的影响。采用单因素试验设计,选取240只体重和胫骨长度相近的9周龄海兰灰商品代蛋鸡,随机分为4个组,每组6个重复,每个重复10只鸡。对照组饲喂SAA水平为0.54%的基础饲粮,试验组分别饲喂在基础饲粮中添加0.08%、0.16%和0.24%可消化蛋氨酸(等量替换各组沸石粉)的饲粮。各组饲粮SAA水平(实测值)分别为0.54%、0.62%、0.70%和0.78%。育成期试验期为7周(9~15周龄);后续的预产蛋期和产蛋高峰期各组采用相同饲粮,持续观察到33周龄末。结果表明:1)育成期饲粮不同SAA水平对海兰灰蛋鸡的终末体重、平均日增重和料重比均无显著影响(P>0.05)。与对照组相比,0.62% SAA组蛋鸡平均日采食量显著提高(P<0.05)。2)10和12周龄,与对照组相比,试验组蛋鸡体重显著提高(P<0.05),且随着饲粮SAA水平的提高,蛋鸡体重呈线性提高(P<0.05);10周龄,与对照组相比,试验组蛋鸡胫骨长度显著增加(P<0.05),且随着饲粮SAA水平的提高,蛋鸡胫骨长度呈线性增加(P<0.05)。3)20周龄,与对照组相比,0.62% SAA组后续产蛋期蛋鸡胫骨长度显著增加(P<0.05);同时,随着育成期饲粮SAA水平的提高,后续产蛋期蛋鸡胫骨长度呈二次曲线变化(P<0.05)。22和29周龄,育成期饲粮添加不同水平的SAA对后续产蛋期海兰灰蛋鸡体重和胫骨长度均无显著影响(P>0.05)。4)育成期饲粮不同SAA水平对21~33周龄海兰灰蛋鸡产蛋性能无显著影响(P>0.05)。综合育成期蛋鸡生长发育及后续产蛋性能,海兰灰商品代蛋鸡育成期饲粮SAA水平以0.62%~0.70%为宜。
This experiment was conducted to investigate the effects of different dietary sulfur-containing amino acid (SAA) levels on growth and development and subsequent growth and laying performance of Hy-Line grey laying hens during growing period. A total of 240 Hy-Line grey commercial laying hens of 9-week-old with similar body weight and tibia length were randomly divided into 4 groups with 6 replicates per group and 10 hens per replicate. Hens in the control group were fed a basal diet with SAA level of 0.54%, and those in experimental groups were fed the basal diet supplemented with 0.08%, 0.16% and 0.24% digestible methionine (replaced zeolite powder in each group in equal quantity), respectively. Dietary SAA levels (measured values) in each group were 0.54%, 0.62%, 0.70% and 0.78%, respectively. The growing period was 7 weeks (9 to 15 weeks of age). Then the same diet was used in the subsequent pre-laying period and peak laying period, and the observation lasted until the end of 33 weeks of age. The results showed as follows: 1) different dietary SAA levels had no significant effects on the final body weight, average daily gain and feed to gain ratio of Hy-Line grey laying hens during growing period (P>0.05). Compared with the control group, the average daily feed intake of laying hens in 0.62% SAA group was significantly increased (P<0.05). 2) At 10 and 12 weeks of age, the body weight of laying hens in experimental groups was significantly increased compared with the control group (P<0.05), which was linearly increased with the increase of dietary SAA level (P<0.05). At 10 weeks of age, the tibia length of laying hens in experimental groups was significantly increased compared with the control group (P<0.05), which was linearly increased with the increase of dietary SAA level (P<0.05). 3) At 20 weeks of age, the tibia length of laying hens in 0.62% SAA group was significantly increased compared with the control group (P<0.05); meanwhile, with the increase of dietary SAA level in growing period, the tibia length in laying period showed a quadratic curve change (P<0.05). At 22 and 29 weeks of age, different dietary SAA levels during growing period had no significant effects on body weight and tibia length of Hy-Line grey laying hens during subsequent laying period (P>0.05). 4) Different dietary SAA levels during growing period had no significant effects on laying performance of Hy-Line grey laying hens from 21 to 33 weeks of age (P>0.05). Considering the growth and development during growing period and subsequent laying performance of laying hens, the optimal dietary SAA level of Hy-Line grey commercial laying hens during growing period is 0.62% to 0.70%.
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