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Badania przeprowadzono w fermie bydła mlecznego zlokalizowanej w zachodniej Polsce. Stwierdzono, że sezon wycielenia krów nie różnicuje istotnie masy ciała zwierząt w 1 i 5 dniu ich życia. Cielęta z wycieleń zimowych rozwijały się istotnie (p≤ 0,01) lepiej (0,560 kg·dobę⁻¹) od urodzonych w sezonie letnio-jesiennym (0,350 kg dobę⁻¹). Długość okresu przygotowania krów do laktacji istotnie (przy p≤ 0,05)...
Badano wpływ przebiegu porodu, kolejności wycielenia krów i płci noworodków na wyniki odchowu 106 cieląt rasy czarno-białej. Odnotowano dwa rodzaje porodów: 1 - poród łatwy - ocielenie spontaniczne, II - poród trudny - ocielenie ze znaczną pomocą człowieka. Efekty odchowu cieląt w okresie żywienia ich siarą zależą istotnie od stopnia trudności porodu, wieku matki oraz płci noworodków. Potomstwo pochodzące...
Badania przeprowadzono w fermie bydła, zlokalizowanej w zachodniej Polsce. Spośród badanych reproduktorów najcięższe cielęta rodziły się po Adamie (40,3 kg), a najlżejsze po buhaju Best (38,0 kg). Różnice między masą ciała noworodków badanych pięciu grup ojcowskich były statystycznie nieistotne. Grupy potomstwa buhajów różniły się istotnie (p≤ 0,05) masą ciała w 5 dniu życia oraz przyrostami dobowymi...
The purpose of the work was the comparison of choice effectiveness of different female groups /cows selected on bull mothers and all selected cows/ to the reproduction. Together, in the analysis, was taken into consideration 2956 cows /in this 459 heads of bull mothers/ enetering to the production in 1963-80 years. In the analysed herds was applied the independent selection which efectiveness was...
Studies embraced 2956 black and white lowland cows /including 459 animals intended to reproduce bulls/ that began production between 1963 and 1980 and were utilized in six breeding byres at the Racot Horse Farm. Analyses have shown that the age at the first calving of the investigated cows was within the limits considered as optimum. The mothers of bulls, considering their greater breeding and utility...
An average number of ejaculates and ejaculate volumes, total yearly ejaculate volume, sperm concentration, percentage of sperm with progressive motion, survival rate of sperm and total number of semen doses obtained from 126 bulls /51 Lowland Red-White and 75 Lowland Black-White/ were examined in the first and the second year of bulls' reproduction performance. We studled 24603 ejaculates in 1976-1985...
Cows from the farms located in the Sudetes and highland of Sudets were included in the studies. Milk production and fertility of 21699 Red-White cows /14029 primigravida/ from 71 state farma and 1707 cows /558 primigravida/ kept on private farms were studied. The phenotype and breeding values of the cows were calculated according to: the number of cows in a stock, location of the farms above sea level,...
The investigations were carried out on seventy five bulls of Black and White Breed and forty six bulls of Red and White Breed used for procreation in the years 1977-1985 in the Animal Breeding and Insemination Centre in Karczów. All ejaculates produced by individual bulls during the first three years were examined. There were 33103 ejaculate features of both bull breeds analysed. The following features...
The data of 234 lactations In 111 bw cows, 217 lactations in 118 crossbred /50% HF/ cows and 275 lactations in 135 crossbred half-blood Swedish-freslan cows were studied. The cows were used in three herds of high productivity /average yield in bw primlgravida during 305 day lactation period reached 390 kg/ in south-west Poland. Statistically significant differences in milk production traits were shown...
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