Changes in the relationship between blood plasma glucose concentration and milk production in Czech Pied cows in the course of the year
2004
Chladek, G. | Machal, L. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Chovu Hospodarskych Zvirat)
The aim of the study was to describe changes in the relationship between blood plasma glucose and milk yield, fat, protein and lactose concentration in Czech Pied cows during the first 100 days of lactation. Groups of 20 to 23 dairy cows were observed monthly for the period of 12 months. The mean lactation number was 2,8, the cows were on average 5.8 days after calving and the mean glucose concentration in blood plasma was 3.93 mmol/L. During the first 100 days of lactation milk yield amounted to 2,581 kg with 3.91 % of fat, 3.48 % of proteins and 4.85 % of lactose. The coefficients of the correlation between blood plasma glucose and the observed milk production parameters calculated independently for each test day ranged as follows: -0.597 to 0.130 for the lactation number, -0.389 to 0.585 for days after calving, -0.462 to 0.361 for milk yield, -0.201 to 0.526 for fat concentration, -0.385 to 0.632 for proteins concentration and -0.600 to 0.469 for milk lactose concentration. The calculated coefficients of the correlation between blood plasma glucose and milk production parameters did not reveal a clear tendency in the relationships. However, the graphic polynomial expression showed that glucose concentration had a positive relationship with days after calving and proteins concentration.
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