Changes in serum glutamic oxaloacetic transaminase (s-GOT) activities, serum alkaline phosphatase activities and serum total protein amounts were investigated on seven Korean native cows having normal estrus cycle of 18-24 days after normal parturition, dividing estrus cycle into estrus (0¡1days), metestrus (2¡6 days), diestrus (7¡16 days), proestrus (17¡20 days). The results were as follows.
1. Serum GOT activities at estrus runged from 73.5 to 121.5 Ku with a mean of 89.14¡¾l7.16 Ku, at metestrus 57 to 89 Ku with a mean of 67.01¡¾10.81 Ku, at diestrus 54 to 89.5 Ku with a mean of 67.05¡¾10.05 Ku and at proestrus 53 to 112 Ku with a mean of 73.00¡¾20.05 Ku. The activities were significantly increased at the estrus comparing with other stages (P <0.01) .
2. Serum ALP activities at estrus ranged from 8.0 to 10.4 K-Au with a mean of 8.74¡¾0.83 K-Au, at metestrus 6.5 to 9.2 K-Au with a mean of 7.74¡¾0.76 K-Au, at diestrus 5.6 to 9.0 K-Au with a mean of 7.67¡¾1.13 K-Au, at proestrus 6.2 to 9.3 K-Au with a mean of 7.12¡¾1.18 K-Au. The significance was not recognized among the stages of estrus cycle.
3. Serum total protein amounts at estrus ranged from 6.45 to 8.0g/100§£ with a mean of 7.25¡¾0.57g/100§£, at metestrus, 6.37 to 7.9g/100§£ with a mean of 7.65¡¾0.50g/100§£, fat diestrus, 7.56 to 8.67g/100§£, with a mean of 7.53¡¾0.55g/100§£ and at proestrus 5.94 to 7.71g/100§£ with a mean of 6.54¡¾0.65g/§£. There was not significance among the stages of estrus cycle.
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