挪威红牛在常规和有机养殖中的生殖性能、乳房健康和乳腺炎分离菌的抗生素耐药性。
Reproductive performance, udder health, and antibiotic resistance in mastitis bacteria isolated from Norwegian Red cows in conventional and organic farming.
机构信息
Norwegian School of Veterinary Science, Department of Production Animal Clinical Sciences, NO-0033 Oslo, Norway.
出版信息
Acta Vet Scand. 2010 Feb 8;52(1):11. doi: 10.1186/1751-0147-52-11.
BACKGROUND
The objectives of this study were to investigate whether there were differences between Norwegian Red cows in conventional and organic farming with respect to reproductive performance, udder health, and antibiotic resistance in udder pathogens.
METHODS
Twenty-five conventional and 24 organic herds from south-east and middle Norway participated in the study. Herds were matched such that geographical location, herd size, and barn types were similar across the cohorts. All organic herds were certified as organic between 1997 and 2003. All herds were members of the Norwegian Dairy Herd Recording System. The herds were visited once during the study. The relationship between the outcomes and explanatory variables were assessed using mixed linear models.
RESULTS
There were less > 2nd parity cows in conventional farming. The conventional cows had higher milk yields and received more concentrates than organic cows. Although after adjustment for milk yield and parity, somatic cell count was lower in organic cows than conventional cows. There was a higher proportion of quarters that were dried off at the herd visit in organic herds. No differences in the interval to first AI, interval to last AI or calving interval was revealed between organic and conventional cows. There was no difference between conventional and organic cows in quarter samples positive for mastitis bacteria from the herd visit. Milk yield and parity were associated with the likelihood of at least one quarter positive for mastitis bacteria. There was few S. aureus isolates resistance to penicillin in both management systems. Penicillin resistance against Coagulase negative staphylococci isolated from subclinically infected quarters was 48.5% in conventional herds and 46.5% in organic herds.
CONCLUSION
There were no large differences between reproductive performance and udder health between conventional and organic farming for Norwegian Red cows.
背景
本研究旨在调查挪威红牛在常规和有机养殖中的繁殖性能、乳房健康和乳房病原体的抗生素耐药性方面是否存在差异。
方法
来自挪威东南部和中部的 25 个常规和 24 个有机牛群参与了这项研究。这些牛群在地理位置、牛群规模和畜舍类型方面进行了匹配，以确保两个队列之间的相似性。所有有机牛群都在 1997 年至 2003 年期间获得了有机认证。所有牛群都是挪威奶牛记录系统的成员。在研究期间，对这些牛群进行了一次访问。使用混合线性模型评估结果与解释变量之间的关系。
结果
常规养殖中第二胎以上的奶牛数量较少。常规奶牛的产奶量较高，比有机奶牛摄入更多的浓缩饲料。尽管经过产奶量和胎次调整后，有机奶牛的体细胞计数仍低于常规奶牛。有机牛群中有更高比例的牛在畜群访问时被干奶。有机和常规奶牛之间首次人工授精间隔、最后一次人工授精间隔或产犊间隔没有差异。在从畜群访问中采集的乳房样本中，常规和有机奶牛之间没有发现乳腺炎细菌阳性的牛比例存在差异。产奶量和胎次与至少有一个乳房细菌阳性的牛比例有关。在这两种管理系统中，金黄色葡萄球菌对青霉素的耐药性都很少见。从亚临床感染的牛只分离的凝固酶阴性葡萄球菌对青霉素的耐药性在常规牛群中为 48.5%，在有机牛群中为 46.5%。
结论
挪威红牛在常规和有机养殖中的繁殖性能和乳房健康方面没有明显差异。
Zotero 插件