Amiata donkey body conformation, udder characteristics, and their relationship with milk yield and quality

IF 1.2 4区 农林科学 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE
F. Salari, I. Altomonte, C. Boselli, M. Martini
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Abstract

Abstract To date, no selective actions have been taken to improve milk traits in dairy donkeys, and the characteristics of the udder are not well defined in relation to the productive characteristics. This study aimed at increasing knowledge on Amiata dairy donkey body conformation, udder traits, and their relationship with milk yield and quality. Morphological, udder, and teat measurements and milk evaluations of 45 pluriparous jennies were carried out. The average wither height of the jennies was 126 cm and the chest girth was 148 cm; a large standard deviation of some body measurements was found. Forty-nine percent of the animals showed a moderately developed udder, while most of the jennies had symmetrical half-udders (96%) and the intermammary cleft was clearly visible in 53% of subjects. Correlation analysis indicated that bigger animals tend to have bigger udders, higher teat diameter, and greater distance between teat tips. A positive correlation between the teat length and the milk fat was found (p < 0.01), which suggests that jennies with longer teats have a better ability to release milk fat. The results of this paper may be useful to define the characteristics of the milking device and address selective choices of the animals.
毛驴身体形态、乳房特征及其与产奶量和品质的关系
迄今为止,还没有采取选择性措施来改善乳驴的奶性状,并且与生产特性相关的乳房特征也没有很好地定义。本研究旨在增加对阿米亚塔奶驴身体形态、乳房性状及其与产奶量和品质关系的认识。对45只多产珍妮进行了形态学、乳房和乳头测量和乳汁评价。牛仔裤平均枯高126 cm,胸围148 cm;发现一些身体测量值有很大的标准偏差。49%的动物表现出适度发育的乳房,而大多数珍妮有对称的半乳房(96%),53%的受试者可以清楚地看到乳房间裂。相关分析表明,体型较大的动物往往有较大的乳房、较大的乳头直径和较大的乳头间距。奶头长度与乳脂呈极显著正相关(p < 0.01),说明奶头长度越长,乳脂释放能力越强。本文的研究结果对确定挤奶装置的特点和解决奶牛的选择问题有一定的指导意义。
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来源期刊
Canadian Journal of Animal Science
Canadian Journal of Animal Science 农林科学-奶制品与动物科学
CiteScore
2.30
自引率
0.00%
发文量
51
审稿时长
6 months
期刊介绍: Published since 1957, this quarterly journal contains new research on all aspects of animal agriculture and animal products, including breeding and genetics; cellular and molecular biology; growth and development; meat science; modelling animal systems; physiology and endocrinology; ruminant nutrition; non-ruminant nutrition; and welfare, behaviour, and management. It also publishes reviews, letters to the editor, abstracts of technical papers presented at the annual meeting of the Canadian Society of Animal Science, and occasionally conference proceedings.
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