Abstract
Parturient and metabolic disturbances in the cow and their influence upon milk production
Highlights
The present investigation deals with the occurrence of parturient disturbances and certain metabolic diseases in Ayrshire cows at the Viik Farm and the effect of these disorders on milk production, especially during the ascending phase of lactation
In evaluating the influence of parturient and metabolic disturbances on milk production, endeavours were made to estimate how much the disturbance changed the shape of the lactation curve at the ascending phase and decreased the peak production
Statistical examination showed that the repeatability of parturient paresis and grass tetany among the cows in the present investigation was rather significant
Summary
There are many disturbances which can occur in connection with calving of the cow, for instance, retention of afterbirth, difficult calving, twinning, birth of a dead calf, and abortion. According to Becker [2] hereditary factors have an influence on the occurrence of grass tetany This disease occurs in lactating cows, and in heifers, beef cattle and bulls According to these research workers, hypomagnesaemia does not occur when the pasture herbage contains more than 0.2 g Mg per 100 g dry matter They recommend a daily dose of 50 g MgO per head of cattle to be given in liquid form throughout the period of risk. The present paper deals with the occurrence of parturient and metabolic disturbances in cattle and their influence upon milk production, especially at the ascending phase. Two days from calving denotes the average of the first three days
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