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±l7.16 Ku, at metestrus 57 to 89 Ku with a mean of 67.01±10.81 Ku, at diestrus 54 to 89.5 Ku with a mean of 67.05±10.05 Ku and at proestrus 53 to 112 Ku with a mean of 73.00±20.05 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±0.83 K-Au, at metestrus 6.5 to 9.2 K-Au with a mean of 7.74±0.76 K-Au, at diestrus 5.6 to 9.0 K-Au with a mean of 7.67±1.13 K-Au, at proestrus 6.2 to 9.3 K-Au with a mean of 7.12±1.18 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±0.57g/100㎗, at metestrus, 6.37 to 7.9g/100㎗ with a mean of 7.65±0.50g/100㎗, fat diestrus, 7.56 to 8.67g/100㎗, with a mean of 7.53±0.55g/100㎗ and at proestrus 5.94 to 7.71g/100㎗ with a mean of 6.54±0.65g/㎗. There was not significance among the stages of estrus cycle.
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