Changes in milk yield of Bulgrian Simmental cows during period of lactation
2001
Ivanov, M. (Kompleksna Opitna Stantsiya, Vidin (Bulgaria))
An experiment was carried out with 156 Bulgarian Simmental cows (BSC) for determination of changes in milk yield durring lactation period.After determination of the day, lactation milk yield was split in periods of equal length for 305 days lactation.The changes in milk yield during different periods of copmlete lactation was determined.It was found that the highest average daily yield of BSC was 25.05 kg and it was observed on 33.95 day of lactation.Up to 102 day it varied in broad ranges and decreased uniformly after that to the end of lactation period.The average milk yield for the highest lactation was 5705.0 +- 86.92 kg, and calving interval varied from 372.86 days to 405.90 days.
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