engleski

The influence of milk production on ovarian cyclicity in period postpartum of simmental cows

The influence of milk production on return of ovarian cyclicity in puerperium of Simmental cows was the aim of research. It included the total of 25 cows at the ages of 2 to 10 years. We determined following metabolic parameters: glucose, total proteins, urea, AST, ALT and creatine kinase and following hormones: progesterone P4 and IGF-I. Cows were divided into two groups and examined gynaecological and by ultrasound. In the first group of 13 cows the milk production was <25 L daily, and in the second group of 12 cows >25 L. We took blood samples twice weekly from 4th till 45th day of puerperium. We determined significantly higher level (P<0, 001) for AST and ALT in group of cows with higher milk production. However, we didn&#8217; t find significant differences (P>0, 05) between the groups in the level of proteins, urea, glucose and creatine kinase. The group of cows with higher milk production the level of progesterone was 8, 81&#177; ; ; 1, 52 nmol/L, and the group of cows with lower milk production it was 10, 82&#177; ; ; 2, 23 nmol/L. The group of cows with higher milk production the level of IGF-I was 75, 06&#177; ; ; 3, 28 ng/mL, and in the group of cows with lower milk production it was 81, 36&#177; ; ; 2, 03 ng/mL. We didn't find significant differences between the groups (P>0, 05) for progesterone P4, as well as for IGF-I. We concluded that for the reestablishment of ovarian cyclicity in Simmental cows the milk production is not of critical importance. Also that the combination of rectal and ultrasound examination, and progesterone P4 and IGF-I serum concentration can precisely diagnose ovarian disfunctions during puerperium.

cows; puerperium; progesterone P4; IGF-1; metabolic parameters

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