The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Hodowcy stosując krzyżowanie międzyrasowe, czy też międzyodmianowe bydła dążą do zrealizowania co najmniej dwóch celów, a mianowicie hodowlanego oraz produkcyjnego. Jak wiadomo w Polsce od blisko dwudziestu lat obie rasy nizinne czarno- i czerwono - białe krzyżowane są bydłem holsztyńsko -fryzyjskim. Z perspektywy tego dwudziestolecia zauważyć można, że znajomość kanonów tej metody hodowlanej miała...
For estimation correction factors 21417 milk and fat lactation yields and 13164 protein yields of Black-White and holstein-friesian cows and crosses are used. Estimated factors for correction milk, fat and protein yields are related to age of cow at calving, season of calving and both. There are different correction factors for age and season of calving for different breeds and crosses and for different...
Proportional correction factors for prediction 305-days milk and fat yields based on short-term cumulated yields dependend on production level, calving season and length of calving period for Black-White and Holstein-Friesian cows and crosses are estimated. Production level affected to all correction factors for days of calving, but calving period and season of calving affected to correction factors...
Proportional, regression and modified regression correction factors for prediction of 305-days milk and fat yield of Black-White and Holstein-Friesian cows and crosses based on short-term cumulated yields were calculated. Cumulation from 1 to 10 and from 10 to 1 month of lactation was considered. There are different correction factors for cows of different breeds and crosses and for different traits.
The aim of this study was ascertainment influence of crossing native breeds red-white and black-white holstein-fresian and ayrshire breeds. On the ground of this analysis it's possible to ascertain that milk composition of cross-breds is not to stray from milk composition of red-white and black-white breeds. Unimportant differences in yield lovels was resulted rather from higher production level of...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.