The use of evolutionary operations to assess the intervention effect on the behaviour of dairy cows

Anna Czubernat, J. Makulska, M. Krogh, A. Stygar
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引用次数: 3

Abstract

The aim of the study was to use evolutionary operations (EVOP) to evaluate changes in the behaviour of dairy cows depending on the strategy according to which they were grouped after calving. The experiment was carried out on a Danish farm keeping about 200 Holstein cows. The farm had two separate areas for lactating cows: a small area with 54 waterbeds and a larger area with 133 beds with mattresses. During the experiment both areas were filled with cows. Cows after calving were introduced to either the small area (group) or the large area (group). After 14 days, the cows from the small group were transferred to the large group. The impact of different cow grouping strategies on their lying time, considered a welfare indicator, was examined. During the 210-day experiment, 195,703 observations were collected. The behavioural data were analysed using a linear mixed-effect regression model fitted by the maximum likelihood method. Days in milk, parity number, and lying time of herd mates were found to significantly affect the lying time of individual cows, while the strategy of cow grouping after calving had no effect on lying time.
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利用进化操作来评估干预对奶牛行为的影响
这项研究的目的是使用进化操作(EVOP)来评估奶牛行为的变化,这取决于产犊后它们被分组的策略。该实验在丹麦的一个农场进行,该农场饲养了大约200头荷斯坦奶牛。该农场有两个独立的泌乳奶牛区:一个小区域有54个水床,一个大区域有133个带床垫的床。在实验期间,两个区域都挤满了奶牛。产犊后的奶牛分为小面积(组)和大面积(组)两组。14 d后,将小组奶牛转移到大组。不同的奶牛分组策略对其躺卧时间的影响,被认为是福利指标,进行了检查。在210天的实验中,共收集观测数据195703份。使用最大似然法拟合的线性混合效应回归模型对行为数据进行分析。产奶天数、胎次数和群体伴侣的躺卧时间显著影响个体奶牛的躺卧时间,而产犊后奶牛分组策略对躺卧时间没有影响。
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审稿时长
12 weeks
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