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SHORT COMMUNICATION
Factors affecting milk yield at peak and during
current lactation of Holstein cows
1
Veterinary College, Federal University of Goias/UFG, Brazil
2
Agricultural College “Luiz de Queiroz”, University of Sao Paulo/USP, Brazil
3
Brazilian Centre of Agriculture and Animal Research/EMBRAPA - Suinos e Aves, Brazil
4
Brazilian Institute of Geography and Statistics/IBGE, Brazil
5
Veterinary Medicine and Animal Science College, University of Sao Paulo/USP, Brazil
Publication date: 2004-08-30
J. Anim. Feed Sci. 2004;13(Suppl. 1):475-478
KEYWORDS
ABSTRACT
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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| ISSN: | 1230-1388 |
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