Influence of metabolic and endocrine status of dairy cows to milk production during early lactation

Providing stable milk production is one of the priorities in dairy cattle. The aim of this study was to examine the relationship between milk production and endocrine and metabolic parameters and to determine whether homeoresis and unfavorable metabolic adaptation affecting milk production during early lactation. The experiment included 40 Holstein cows. The blood was taken during the first week of lactation, and is determined by the glucose concentration, Ca, and BHB bilirubin. Milk production was monitored in first 8 weeks of lactation. The results show that cows with lower values of insulin and higher values of cortisol and STH have higher milk production in the first weeks of lactation. However, these relationships are not easy and apparently are caused by other factors, and depend on the week in which we investigated the concentrations of the hormones themselves. When cows classified according to the metabolic status, so to compare milk production between cows with unfavorable and favorable metabolic status at the result showing that cows who have an unfavorable metabolic status (lower concentrations of glucose and calcium and higher BHB and bilirubin concentration) showed lower milk production. Impact of endocrine and metabolic status on milk production has been determined. A relationship between hormones, metabolites, and milk production is complex and must be interpreted within the concept of homeostasis and homeoresis or biological capacity of cows to adjust to lactation but also to maintain the continuity of the body.