The sentence is a grammatical mess, especially the part in bold. I guess it would improve marginally if there were a colon after entered into them. What follows explains the speculative element: the cattle might deteriorate or be productive.
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AvangiIt badly need a rewrite. It should be a simple list of "all these qualities."
1. the diversity in valuebetweenamong different cattle,
Do you think that between is the better choice if 'different cattle' is used to distinguish between cows, bulls and steers?
Colombo "But the diversity in value between different cattle, the great size of the units, and the fact that they could not be divided, as well as the speculative element which entered into them the cattle might deteriorate in keeping, they might also be productive while kept: all these qualities would make such a unit inadmissible in times when calculation is c