Abstract The study aims to simulate the alternative methods of simplifying weight recording of Tunisian local kids and assesses the impact of their use from a genetic point of view to set up the basis for the future improvement of this important component of efficient production. A total of 13,095 weight records of 945 kids, progeny of 285 females and 19 males were collected over a period of 16 years in the caprine herd of the Arid Areas Institute of Médenine (South East of Tunisia).Weights were taken at six standard ages (10, 30, 60, 90,120 and 150 days) at a weekly pace. Alternative simplified schemes were simulated by skipping from 1–7 weeks of recording and performance in terms of predicting weights at the standard ages was evaluated. In addition, random regression model (RRM) including age of females, interaction sex × type of birth, interaction year × month of birth was used as fixed effects. Also, animal- and maternal permanent environmental as random effects, were fitted to the data set. Alternative simplified recording systems were then evaluated in terms of modifications in estimated genetic parameters and correlations among estimated breeding values. Results showed that 1–3 weeks of time between recordings yielded accurate estimates of weights at the standard ages. The effect of the simplified weight recording was especially relevant at the extreme weights, at 10 and at 150 days of age, that the spacing of successive controls affects the accuracy of the estimate. The lack of registration of birth weight showed a significant deterioration in the estimate of weight at 10 days. Only the simplification of the weights recording to one and two-week resulted in direct and maternal heritability’s for the different growth traits of local kids, similar to those obtained by the standard age growth recording. Selecting the critical ages that define changes in growth components seems to be more critical than using more frequent weighing in terms of estimation of the genetic components of weight of kids in this population. Highlights This type of local kids measurement simplification can be seen as an alternative: ^ To enhance the economical aspect of the sheep recording scheme. ^ Reduce animal disturbance. According to the results of this study, the adoption of a common growth control system seems difficult since the breeding objectives and for farming systems are not the same.

中文翻译：

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在低投入生产系统下，简化的生长记录方法对突尼斯当地山羊种群遗传参数估计的影响

摘要 本研究旨在模拟简化突尼斯当地儿童体重记录的替代方法，并从遗传角度评估其使用的影响，为未来改进这一高效生产的重要组成部分奠定基础。在 16 年的时间里，在 Médenine 干旱地区研究所（突尼斯东南部）的山羊群中收集了 945 个孩子的 13,095 份体重记录，其中 285 只雌性和 19 只雄性的后代。在六个标准年龄测量体重（10、30、60、90,120 和 150 天）每周一次。通过跳过 1-7 周的记录和在预测标准年龄的体重方面的表现来模拟替代的简化方案。此外，随机回归模型（RRM）包括女性年龄、交互性别×出生类型、交互年×出生月被用作固定效应。此外，作为随机效应的动物和母体永久环境也适用于数据集。然后根据估计遗传参数的修改和估计育种值之间的相关性评估替代的简化记录系统。结果表明，记录之间的 1-3 周时间可以准确估计标准年龄的体重。简化体重记录的效果与极端体重、10 日龄和 150 日龄特别相关，连续控制的间隔影响估计的准确性。出生体重登记的缺失表明 10 天时体重估计值显着恶化。只有将体重记录简化为一周和两周才能得出当地儿童不同生长特征的直接遗传力和母系遗传力，与标准年龄增长记录获得的相似。在估计该人群中儿童体重的遗传成分方面，选择定义生长成分变化的临界年龄似乎比使用更频繁的权重更重要。亮点 这种本地儿童测量简化可以看作是一种替代方法： ^ 提高绵羊记录方案的经济性。^ 减少动物干扰。根据这项研究的结果，由于育种目标和耕作系统不同，采用共同的生长控制系统似乎很困难。