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2 2013

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Mykoplazmy jako czynnik wywołujący zapalenie wymienia u krów mlecznych

100%

Bednarko-Mlynarczyk E. , Szteyn J. , Wiszniewska-Laszczych A. , Liedtke K.

nr 07

Mycoplasma mastitis is one of the most pressing problems in herds of cows, especially in regions of increased milk production. Clinical signs in infected animals are not specific and the diagnosis of its causes should be based on laboratory testing. The classical scheme of investigation used in laboratories does not allow for their detection and should be extended to one of their methods of detection. Increased opportunities to detect mycoplasma are attained by proper storage of the milk samples.

Quality of milk of cows in the first lactation vs. presence of anti-Ostertagia antibodies in their milk

88%

Liedtke K. , Szteyn J. , Bialobrzewski I. , Wiszniewska-Laszczych A. , Bednarko-Mlynarczyk E.

nr 2

Invasions of gastrointestinal nematodes in dairy cows may affect animals productivity. The most frequently detected internal parasite of dairy cattle is Ostertagia ostertagi. The objective of this study was to determine O. ostertagi invasion extensiveness in selected herds of dairy cattle, with special consideration to cows being in the first lactation, and to analyze the milk yield and contents of basic constituents of milk originating from sero-positive cows. Five herds of dairy cattle (403), with different populations of cows, were selected for the study. Invasion extensiveness in particular herds was determined and ranged from 11.9% to 27.27%. Cows being in the first lactation, the udder milk of which was shown to contain anti-O. ostertagi antibodies, were producing on average 470 kg of milk annually less than cows being in the same lactation period. The analysis of results did not confirm the statistical significance of this difference, likewise it did not demonstrate any statistically significant differences in contents of fat, protein and dry matter. Despite a lack of the statistical significance a producer suffers great economic losses. The conducted study proves that the occurrence of O. ostertagi invasion in herds of dairy cattle is a global problem and that it affects cost-effectiveness of milk production.