Nordic Cattle Genetic Evaluation, Skejby, DK-8200 Aarhus, Denmark; Department of Molecular Biology and Genetics, Aarhus University, 8830 Tjele, Denmark.
Nordic Cattle Genetic Evaluation, Skejby, DK-8200 Aarhus, Denmark.
J Dairy Sci. 2018 Dec;101(12):11033-11039. doi: 10.3168/jds.2018-14804. Epub 2018 Sep 20.
The human-animal relationship in dairy cattle is reflected in the trait "temperament" in breeding programs and is mainly based on observations by farmers. However, farmers' knowledge of an individual cow's temperament decreases with an increased herd size, and this has been the case in many countries during the last decades. The aim of this study was to investigate if temperament recorded by classifiers and automatic milking systems is heritable, and estimate the genetic relationship with farmer-assessed temperament. Farmer-assessed temperament is defined as the overall assessment of the individual cows' temperament at milking and handling. Data on handling temperament were recorded by Danish classifiers from October 2016 to April 2017 on a 1 to 9 scale specially designed for this purpose. Data from automatic milking systems were recorded from January 2010 until April 2017, where connection time and number of attachments per teat were classified as milking temperament traits. Estimated heritabilities were relatively low for handling temperament (0.13) and farmer-assessed temperament (0.10). For milking temperament traits, connection time showed higher heritability than number of attachments per teat (0.36 and 0.26, respectively). The genetic correlation between farmer-assessed temperament and handling temperament was highly favorable (0.84). The genetic correlations between handling temperament and the 2 milking temperament traits, connection time and number of attachments per teat, were low (-0.02 and -0.10, respectively). Moderate genetic correlations were estimated between farmer-assessed temperament and connection time (-0.29) and between farmer-assessed temperament and number of attachments per teat (-0.37). The genetic correlations and heritabilities suggest a basis for further investigations of the possibility of including handling or milking temperament traits (or both) in the breeding program for temperament in dairy cattle.
奶牛的人-动物关系反映在育种计划中的“气质”特征上，主要基于农民的观察。然而，随着牛群规模的增加，农民对个体牛气质的了解会减少，这在过去几十年的许多国家都是如此。本研究旨在调查通过分类器和自动挤奶系统记录的气质是否具有遗传性，并估计与农民评估气质的遗传关系。农民评估的气质定义为在挤奶和处理时对个体牛气质的整体评估。处理气质的数据是由丹麦分类器从 2016 年 10 月至 2017 年 4 月记录的，该数据是专门为此目的设计的 1 到 9 分制。自动挤奶系统的数据从 2010 年 1 月到 2017 年 4 月记录，其中连接时间和每个乳头的附着物数量被归类为挤奶气质特征。处理气质的估计遗传力相对较低（0.13）和农民评估的气质（0.10）。对于挤奶气质特征，连接时间的遗传力高于每个乳头附着物的数量（分别为 0.36 和 0.26）。农民评估的气质和处理气质之间的遗传相关性非常好（0.84）。处理气质与 2 个挤奶气质特征（连接时间和每个乳头附着物的数量）之间的遗传相关性较低（分别为-0.02 和-0.10）。农民评估的气质与连接时间（-0.29）和农民评估的气质与每个乳头附着物的数量（-0.37）之间的遗传相关性中等。遗传相关性和遗传力表明，有必要进一步研究在奶牛气质育种计划中包含处理或挤奶气质特征（或两者）的可能性。
Zotero 插件