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首页> 外文期刊>Tropical Animal Health and Production >Applicability of teeth examination as a tool for age estimation in a semi-arid cattle production environment in Namibia
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Applicability of teeth examination as a tool for age estimation in a semi-arid cattle production environment in Namibia

机译：牙齿检查的适用性作为纳米比亚半干旱牛生产环境中的年龄估计工具

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Regression analysis was used to evaluate teeth examination as a tool for estimating age in beef and dairy cattle at Neudamm farm, Namibia, in 2018. There was a significant difference in age (months) between the overall mean actual age (M=60, SD=4.57) and the mean estimated age (M=57, SD=4.52 months) in beef cattle; t(74) = 3.61,p<0.001. There was no significant difference between the overall mean estimated age and the mean actual age (M=42.5, SD=5.18) and (M=41.3, SD=5.21 months) in dairy cattle; t(30) = 1.45,p=0.16. There was a very strong positive relationship between the overall teeth examination-estimated age and actual age in beef cattle [r (74) = 0.98, p<0.001]. There was a very strong positive relationship between the overall teeth examination-estimated age and actual age in dairy cattle [r (30) = 0.99, p<0.001]. A very strong positive relationship was also evident between the teeth examination-estimated age and actual age in beef cattle aged 45 months and below [r (37) = 0.93, p<0.001]. There was a very strong positive relationship between the teeth examination-estimated and actual age in dairy cattle aged 45 months and below [r (20) = 0.97, p<0.001]. There was a very strong positive relationship between the teeth examination-estimated age and actual age in beef cattle aged over 45 months [r (35) = 0.93, p<0.001]. There was a very strong positive relationship between the teeth examination-estimated age and actual age in dairy cattle aged over 45 months [r (8) = 0.97, p<0.001]. It was therefore concluded that under the given conditions of the study and the range of ages and the breeds under study, age estimation through teeth examination is reliably applicable for aging cattle in general. Age estimation through teeth examination was found to be more accurate in dairy than in beef cattle.
机译：回归分析用于评估牙齿检查作为纳米比亚纳米比亚纳杜德农场的牛肉和奶牛的年龄的工具，在2018年。总体平均年龄（M = 60，SD）之间的年龄（月份）存在显着差异= 4.57）和牛肉中的平均估计年龄（m = 57，sd = 4.52个月）; T（74）= 3.61，P <0.001。总体平均估计年龄与平均实际年龄（M = 42.5，SD = 5.18）和（m = 41.3，SD = 5.21个月）之间没有显着差异; T（30）= 1.45，p = 0.16。在牛牛的整体牙齿检查估计年龄和实际年龄之间存在非常强烈的正面关系[R（74）= 0.98，p <0.001]。在乳制品牛的整体牙齿检查估计的年龄和实际年龄之间存在非常强烈的积极关系[R（30）= 0.99，p <0.001]。牙齿检查估计的年龄和45个月牛肉中的牙齿检查估计年龄和实际年龄之间也明显显而易见[R（37）= 0.93，p <0.001]。牙齿检查估计和45个月奶牛的实际年龄之间存在非常强烈的积极关系，低于[R（20）= 0.97，p <0.001]。牙齿检查估计的年龄和牛肉牛的实际年龄有一个非常强烈的正面关系[R（35）= 0.93，p <0.001]。牙齿检查估计的年龄和乳制品牛的实际年龄有一个非常强烈的正面关系[R（8）= 0.97，P <0.001]。因此，得出结论认为，在研究的给定条件和研究范围和研究中，通过牙齿检查的年龄估计是可靠适用于一般的老化牛。通过牙齿检查的年龄估计被发现在乳制品中比牛肉更准确。

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