THE EFFECT OF SELECTED FACTORS ON FRESHENING MILKING EFFICIENCY IN PRIMIPAROUS POLISH HOLSTEIN-FRIESIAN BLACK-AND-WHITE COWS
Journal Title: Folia Pomeranae Universitatis Technologiae Stetinensis Agricultura Alimentaria Piscaria et Zootechnica - Year 2017, Vol 42, Issue 334
Abstract
Sire origin as well as age and body weight of heifers at fertilization were shown to have a statistically significant effect on freshening milking efficiency in Polish Holstein-Friesian Black- -and-White primiparous cows. The highest milk yields during the freshening stage were recorded for daughters of bulls from North America and primiparous cows, which were fertilized as heifers aged > 16 months and at body weight > 475 kg. Most probably the high genetic potential of HF cattle from North America, exceeding European cattle in terms of milk yield, was connected with the longer period of their upgrading and in combination with the improvement of local production conditions ensured the most advantageous results. It seems that milk yield in the freshening period is affected by body weight and development of heifers rather than their age at fertilization. In order to reduce the rearing stage in young females it is recommended in that period to apply more intensive nutrition.
Authors and Affiliations
Jarosław PYTLEWSKI, Ireneusz R. ANTKOWIAK, Daniel STANISŁAWSKI, Ewa CZERNIAWSKA-PIĄTKOWSKA
Keywords
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