Factors affecting milk yield at peak and during
current lactation of Holstein cows

With the objective of investigating the impact of events occurring pre and postpartum on milk yield at peak and during lactation, data were collected from 1.042 lactations of 665 Holstein cows. Body condition score (BCS), calving season (CS), dry period length (DPL), occurrence of diseases and milk yield were registered. Calving season (summer), DPL, BCS at drying off, first somatic cells count (SCC) after calving, occurrence of retained placenta and of displaced abomasum negatively affected milk yield at peak. The same events, excluding CS, and including occurrence of clinical mastitis until 60 days post-partum, negatively affected milk yield during lactation.

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Assigning DOI numbers, introducing articles from supplements and recent publications to POL-index database, maintaining anti-plagiarism detection, electronic system to proceed manuscripts and webpage of the Journal with interactive pdf files, and language correction of manuscripts published in Journal of Animal and Feed Sciences are financed in the years 2018–2019 by the Ministry of Science and Higher Education from the funds for science popularization activities, Agreement No. 631/P-DUN/2018.

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