Abstract:
Experiments were performed, between (August 2004) and (November
2005) at a Dairy Farm, Shambat, area Sudan, to study the effects of parity
number, stage of lactation and season of calving on milk yield, milk
.composition and constituents of blood
Milk yield varied significantly (P<0.01) with the parity number and stage of
.lactation (P<0.01) only
Milk total solids, fat, total proteins, solid not fat, Na, K, and Po4 varied
significantly (P<0.05) with the stage of lactation as well as with the season of
calving, while the milk ash, moisture and calcium content were not affected by
stage of lactation and season
The highest concentrations of blood total proteins, albumin (P<0.01) and
glucose (P<0.05) were obtained from animals at the first and second stages of
lactation and the lowest were obtained from animals at late stages of lactation .
The opposite was true for blood content of Na, K, Mg and Po4
Second parity animals had significantly higher values for haemoglobin
concentration(P<0.01) and packed cell volume (P<0.05) than the first parity
animals. Erythrocyte and total leucocyte count were not affected by the parity
.number
