EFFECT OF PREGNANCY ON BLOOD METABOLITES AND MILK COMPOSITION OF COWS

Animals were divided into 4 groups according to their fertility status. Group A animals were non pregnant which had not been served. Group B included animals which had been served but not conceived. Group C included 90 days pregnant animals while group D included animals of greater than 90 days pregnancy. Significantly higher glucose values were noted in non pregnant animals which had not been bred followed by animals of 90 days pregnancy and then by non pregnant while lowest values were recorded in animals greater than 90 days pregnancy with mean values of 43.88,42.80.42.32 and 25.20 respectively. Highest blood protein values were recorded in non pregnant animals which had been served (93.48) followed by animals of 90 days pregnancy (91.28) and then followed by non pregnant animals which had not been served (88.25). Lowest blood protein values were recorded in pregnant animals of greater than 90 days (82.35). Blood Triglycerides were highest in animals greater than 90 days pregnancy (11.58) followed by 90 days pregnant animals and then by animals which had been served but not conceived(10.33). Lowest Triglycerides were noted in non pregnant animals which had not been served (9.77). Highest milk production was recorded in animals greater than 90 days pregnancy (10 lit) followed by non pregnant animals which had not been served (8.45lit) and then by animals which had been served but not conceived (7.08) while lowest milk production was noted in pregnant animals of 90 days (6.63). Highest milk fat values were found in non pregnant animals which had not been served (5.18). Milk fat values were same in pregnant animals which had been bred and more than 90 days pregnant animals (5.10). Milk fat values were lowest in 90 days pregnant animals. As pregnancy advances, SNF decreases. Lactose was recorded significantly highest in NP animals (3.61) followed by NPNS animals(3.55) and then by 90 days pregnant animals(3.27).while lactose was lowest in 90 days pregnancy(3.17).Lactose is also inversely proportional to pregnancy. Highest protein values were recorded in NP (21.55) followed by NPNS (2.51) and then by 90 days pregnant animals(2.36). Animals greater than 90 days pregnancy had lowest values of milk protein (2.26). It is concluded that pregnancy cause significant effect on milk composition and blood metabolites.

Keywords: Pregnancy, Blood metabolites, milk, cow.