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Relationship between the parity and oxidative stress in high-performance Polish Holstein-Friesian cows after the peak of lactation. There are many factors, which may expose cows attacks of free radicals. The highest level of oxidative stress appears in the parturition period and at the peak of lactation. Therefore, the purpose of this study was to demonstrate the relationship between the parity and...
Relation between the shape and course of lactation curve and production traits of Polish Holstein-Friesian and Montbeliarde cows. The aim of the study was to examine the relation between shape and course of lactation curve and production traits of Polish Holstein-Friesian and Montbeliarde cows kept under various production systems. The production parameters were based on cows records developed by...
Comparison of calving course of Charolaise purebreds and their crossbreeds with Polish Holstein-Frisian cows. Calving course of cows of Charolaise breed covered by bulls of the same breed as well as cows of Polish Holstein Friesian breed inseminated with Charolaise bull’s semen was investigated. In purebred population the material was taken from the beef cattle recording scheme provided by the Polish...
The material of the study consisted of 140 cows of PHF breed, reared in the farm equipped with the automatic milking system (AMS). Cows in different lactations (from 1 to 5) were reared in the period from May 2011 to April 2013. The daily distribution of milkings (12, two-hours periods) was analyzed according to: cows’ age (primiparous and multiparous), the average milk production per milking during...
Investigations aimed to evaluate the effectiveness of Boviseptivac, vaccine against bovine pasteurellosis prepared from the Polish isolates of serotype B:2 with an oil adjuvant (Emulsigen). The vaccine protective value obtained on white mice was 4.25 according to the method of Ose and Muenster. Field trials carried out on 120 cows in the Ostroleka province revealed advantageous properties of the vaccine,...
Whole blood samples from 73 animals from a dairy herd infected with BLV were used for detection of proviral DNA by means of PCR technique. At the beginning 24 cows were examined with primer set ZM1/ZM2. Seven out of 13 ELISA-positive animals –were PCR-positive too and 3 were PCR-positive among 11 serologically negative. Due to unsatisfactory results the rest of the samples were tested with a second...
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