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The material for the analyses comprised blood samples collected from 65 Zlotnicka Spotted (Zlp) sows and 43 Zlotnicka White (Zlb) sows born and kept in two herds in Wielkopolska. While analysing reproductive, fattening and slaughter traits, information was collected on 290 litters, including 180 litters of Zlp sows and 110 litters of Zlb sows. Intravital measurements were taken using a Piglog 105...
The subject of the study refers to the effect of housing and milking systems on yield, chemical composition, and cytological quality of milk from primiparous cows held in two barns belonging to the same owner where cows were fed using the same feed. Cows from barn C were kept in deep litter and milked in a fishbone milking parlour, whereas cows from barn M were kept in box stalls with litter bedding...
The analysis concerned the longevity and production period of beef cattle of seven breeds born in 1990-2011, as well as the reasons for culling the animals. We observed a distinct tendency for a decrease in the average production period in beef cattle herds. It has been estimated that the longevity of beef cattle is influenced highly significantly by the sex, breed, birth year, and birth season. Most...
The aim of the research was the pedigree analysis of top yielding cows. The investigation concerned the effects of male ancestors on the productivity of their female progeny. The total of 3,187 pedigrees of Holstein-Friesian cows with lifetime milk production of over 100,000 kg were examined. The cows were descendants of 971 sires. On the basis of the pedigree analysis it had been proved, that the...
Relationships were estimated between longevity, culling reasons and yield of milk and milk components in the I, II and III 305-day lactations and lifetime dairy performance. ANOVA with Duncan test was applied. Cows culled for health problems showed the highest lifetime dairy performance; those kept in the herd for a short of time were culled because of hard milking and behavioural problems or were...
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