Relationship Between Blood Metabolic Profile and Milking Performance in Holstein Cows

초록

This study was conducted to evaluate the relationship between blood metabolic profile and milking performance in Holstein cows. 858 cows were each allocated to four or five groups according to lactation stage, milk yield, and parity. Milk performance and serum metabolites were collected and analyzed with respect to experimental conditions. Mean serum glucose concentration was lower in the early- and mid-lactation groups (p < 0.05), but non-esterified fatty acid (NEFA) concentration was higher in early-lactation and dry-period groups (p < 0.05). Serum blood urea nitrogen and Mg concentrations were higher in the early- and mid-lactation groups than in the late-lactation and dry-period groups. NEFA, albumin, and cholesterol concentrations were highest in the > 40 kg/d group (p < 0.05). Glucose, cholesterol, and Mg concentrations were higher in the parity 1 group than in the other parity groups (p < 0.05), and total protein and globulin concentrations were higher in the parity 4 and 5 groups than in the lower parity groups. Thus, we recommend that blood metabolic profiles be considered with lactation stage, milk yield, and parity to more accurately determine the nutritional and health statuses of Holstein cows.

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