SERUM AND ESTRUS MUCUS ENZYMES ACTIVITIES AND CHEMISTRY OF NORMAL AND REPEAT BREEDER FRIESIAN CATTLE

Estrus mucus (EM) and blood (serum) was collected from 40 apparently normal cattle (Normal breeder, NB = 20; Repeat breeder, RB = 20) at the time of insemination for glucose, minerals, alkaline phosphatase (ALP), lactic dehydrogenase (LDH) and α-amylase concentration. In NB cattle, serum glucose and magnesium were low (p 0.05) in NB and RB cattle, while RB cattle EM had lower (p<0.05) α-amylase. The pregnancy rate calculated after four maximum inseminations and following categorization into NB or RB cattle was 80% and 60%, respectively. In brief, the variations in serum and estrus mucus enzyme activities and chemistry could be associated with breeding success in Friesian cattle.