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首页> 外文期刊>International Journal of Poultry Sciences >Influence of Stocking Density on Bone Development in Family Chickens Reared up to 18 Weeks of Age Under Intensive System
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Influence of Stocking Density on Bone Development in Family Chickens Reared up to 18 Weeks of Age Under Intensive System

机译：精养系统下饲养密度对18周龄以下家养家鸡骨发育的影响

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This study investigated the influence of stocking density on bone development of family chickens up to 18 weeks of age. A total of 232 unsexed day-old family chicks were used in a completely randomized design. Birds were randomly assigned to four stocking densities, i.e., D1 (10 birds/m2), D2 (13 birds/m2), D3 (16 birds/m2) and D4 (19 birds/m2) in the first phase (0-6 weeks). Each treatment was replicated four times. Two birds were slaughtered at 6, 12 and 18 weeks of age from each replicate to evaluate bone length, bone width, bone weight and bone chemical composition (ash weight, Ca, P and Mg). In the second phase (7 to 12 weeks) the stocking densities were 8 birds/m2 (D1), 11 birds/m2 (D2), 14 birds/m2 (D3) and 17 birds/m2 and 6 birds/m2 (D1), 9 birds/m2 (D2), 12 birds/m2 (D3) and 15 birds/m2 (D4) in the final phase (13 to 18 weeks). General Linear Model (GLM) procedure of Statistical Analysis System was used to estimate the differences between treatment means for different stocking densities. Stocking density in all the three phases did not have a significant (p>0.05) effect on bone dimensions and chemical composition . It is therefore concluded that stocking density had no influence on bone development of family chickens raised up to 18 weeks of age under intensive system probably due to slaughtering that occurred at six weekly intervals. It appeared that family chickens could be raised at a density of 15 birds/m2 in winter without any detrimental effect on bone development and related parameters. Further studies should be done using identical densities throughout the research period to avoid disturbing the control which will make blocking by age possible.
机译：这项研究调查了放养密度对18周龄以下家鸡骨骼发育的影响。在完全随机的设计中，总共使用了232只无性别的一天大的家禽。在第一阶段（0-6），将鸟随机分配为四种放养密度，即D1（10鸟/ m2），D2（13鸟/ m2），D3（16鸟/ m2）和D4（19鸟/ m2）。周）。每个处理重复四次。每次重复分别在6、12和18周龄处死两只家禽，以评估其骨长，骨宽，骨重和骨化学成分（灰分，钙，磷和镁）。在第二阶段（7至12周），放养密度为8羽/平方米（D1），11羽/平方米（D2），14羽/平方米（D3）和17羽/平方米和6羽/平方米（D1） ，最后阶段（13到18周）为9羽/平方米（D2），12羽/平方米（D3）和15羽/平方米（D4）。统计分析系统的通用线性模型（GLM）程序用于估计不同放养密度的处理方式之间的差异。在所有三个阶段中，放养密度对骨尺寸和化学成分没有显着（p> 0.05）的影响。因此得出的结论是，在强化系统下，放养密度对18周龄以下的家养鸡的骨骼发育没有影响，这可能是由于每隔六周进行一次屠宰。看来冬天可以以15只/ m2的密度饲养家禽，而对骨骼发育和相关参数没有任何不利影响。在整个研究期间，应使用相同的密度进行进一步的研究，以避免干扰控制，因为控制将可能导致年龄的增长。

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