Variation in milk composition and somatic cell count of Holstein-Friesian cows of different parity
1996
Bedo, S. | Szekely, Zs. (Godolloi Agrartudomanyi Egyetem, Godollo (Hungary)) | Gundel, J. (Allattenyesztesi Teljesitmenyvizsgalo Kft., Nagyremete (Hungary))
The investigations were carried out using 1st, 2nd and 3rd-lactation of 75 cows. Daily milk yield, fat, protein and lactose content and somatic cell count were measured monthly during 10 months of the lactation. Fat and protein yield increased with parity and with increasing milk yield. Negative correlations were found between daily milk yield and fat percent on one hand, and between daily milk yield and protein percent on the other hand (r=-0.46 - -0.47 and r=-0.33 - -0.50, respectively). The correlations were closest for the 3rd lactation. Positive correlation, increasing with parity was detected between fat percent and protein percent (r=0.38-0.55). Somatic cell counts were lowest during the 1st lactation. High cell counts were detected during the 1st month of the lactation which later gradually decreased. More elevated cell counts were found again in the 6th month which were decreasing again. No or week correlations could be detected between somatic cell count and daily milk yield and percentages of milk components. According to these results somatic cell count levels of 450 000-665 000/ml seem to have no impact on milk composition
Показать больше [+] Меньше [-]