PJB-2010-136
PERIODIC EVALUATION OF POTASSIUM TRANSFER FROM SOIL AND FORAGE TO SMALL RUMINANTS ON AN EXPERIMENTAL STATION IN SOUTHERN PUNJAB, PAKISTAN
ZAFAR IQBAL KHAN1*, M. ASHRAF2**, KAFEEL AHMAD1 AND EHSAN ELAHI VALEEM3*
Abstract
The premier purpose of the present investigation was to appraise the impact of season and the sampling period, the transport of K from soils and forages to sheep grazing in the semi-arid region of Punjab. The ultimate aim was to enhance animal production by employing a balanced K supplementation, if necessary. The samples of soil, H2O, feed, forage and animal (urine, faeces, milk and blood plasma) were taken eight times fortnightly during two seasons (winter and summer). During summer, K level in soil was found to be adequate for plants, while forage K was above the critical levels for ruminant requirements during both seasons. The plasma K levels were less than required levels in all classes of sheep during both seasons. Milk K concentrations showed no lactation period effect. The lactating sheep had higher faecal K during winter and the non-lactating sheep during summer than that in the male sheep, while urine contained higher K in the lactating as compared to that in the non-lactating sheep during summer and winter. Dietary sources showed no significant effect in enhancing the plasma K status of these animals. Low plasma K may have been due to high excretion through faeces resulting from low absorption and availability through the gastrointestinal tract. Overall, K appraisal based on plasma concentration may be considered inadequate mainly due to unavailability of this mineral from the dietary sources. It is concluded that high bio-available K supplementation is needed for increased animal productivity in this region.
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