Abstract
This study aimed to evaluate milk composition and metabolic profile of Holstein cows at different calving orders in the beginning, middle, and end of lactation. One hundred ten Holstein cows were housed in a free stall system receiving the same diet and were grouped according to calving order (first, second, third, and fourth calving) and days in milk (DIM): early (1-90 DIM), middle (91-180 DIM), and end of lactation (over 181 DIM) for comparing milk yield, milk composition, and blood metabolic profile between the calving orders within the same lactation period. These parameters were also evaluated between lactation periods of the cows in different calving orders. The calving order, in any lactation stage, had no influence on milk yield per day and blood biochemical profile of Holstein cows receiving the same diet. However, calving order in all stages of lactation influenced milk composition. The first, second, third, and fourth calving order had no effect on the blood biochemical profile of Holstein cows, in any lactation stage. On the other hand, the different stages of lactation influenced milk yield and milk composition of Holstein cows.
Highlights
Milk composition is related to animal nutrition (Fievez, Colman, Castro-Montoya, Stefanov, & Vlaeminck, 2012)
The present study aimed to evaluate milk yield, milk composition, and blood metabolic profile of Holstein cows at different calving orders and lactation stages
The dried extract defatted in the first, second and third order of deliveries complied with the current legislation, which requires at least 8.4%, a fact that was not observed in fourth-order cows, differently from the results found by Milani et al (2011), who concluded that the calving order did not influence milk composition of cows in a period over one hundred days post-calving
Summary
Milk composition is related to animal nutrition (Fievez, Colman, Castro-Montoya, Stefanov, & Vlaeminck, 2012). The urea content in milk is used as indication of excess protein in the diet or poor quality that protein. These variations are large both during the day and between animals and at different. Care should be taken regarding the interpretation of results, as there may be other predisposing factors, such as cow's age and body condition. In this context, the present study aimed to evaluate milk yield, milk composition, and blood metabolic profile of Holstein cows at different calving orders and lactation stages
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