Wydanie 318(34)2 2015

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Open Access
Dry Period Length and milk Yield in the Next Lactation
(Wydawnictwo Uczelniane Zachodniopomorskiego Uniwersytetu Technologicznego w Szczecinie, 2015) Siatka, Kamil; Sawa, Anna; Department of Cattle Breeding, University of Technology and Life Sciences in Bydgoszcz, Poland; Department of Cattle Breeding, University of Technology and Life Sciences in Bydgoszcz, Poland
The present review attempts to sum up the knowledge concerning the effect of dry period length on the milk yield of cows in the next lactation. The dry period is characterized by radical changes in the anatomy, histology and physiology of the mammary gland, which undergoes the stages of active involution, steady state, and colostrum production. The 60-day dry period, once considered optimal, was adopted at the beginning of the 20th century. However, the duration of this period needs to be revised because intensive breeding work that has been carried out over the last 40 years coupled with improvements in environmental conditions caused the milk yield of cows to double in many countries. Higher milk yields increased changes in cow productivity, among others by extending lactations, which possibly indicates that cows are able to produce milk for a long time, as a result of which the dry period could be shorter.