The effects of age and suckling on the chymosin and pepsin activities in abomasums of goat kids were studied using column chromatography. The results showed that the chymosin activity in abomasums of suckling kids at 5 days of age was significantly greater than other age groups (P < 0.01); chymosin activity of random suckling kids decreased with increasing age (P < 0.01); chymosin activity of weaned kids gradually decreased from 10 to 20 days (P < 0.01), and then remained unchanged (P < 0.05); pepsin activity showed a trend of increasing with the advance of age. For kids of the same age, the chymosin activity in the suckling group ranked the highest, the random suckling group the second, and the weaned group the last, but the pepsin activity was in reverse order.
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Zhang et al. (2005) studied this question.
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