Effect of lactation stage and calve sex in some of milk components in Iraqi Riverine Buffalo

الملخص EN

The present study was carried out at local buffalo flock in AL-Najaf province , by using data collected for 40 reverine buffalo in different lactation stage thought the year 2013 to determine the effect of lactation stage and sex of birth in milk protein , lipids , lactose ,ash solid not fat ,calcium ,density, freezing point and water.

Results was showed a significant effect (p ≤ 0.05 ) of lactation stage in milk lipids, protein, ash and freezing point, the highest values were in late period of lactation (9.5 g / l ,4.0 g / l ,0.84 g / l and-29.85 c°) respectively.

Lactose and density were increased significantly (p ≤ 0.05 ) in the beginning of lactation period its about 4.53 g / l and 54.33 ml / gm respectively compared with end of lactation period its about 3.38 g / l and 43.67 ml / gm respectively.

S.N.F, calcium and water were not affected significantly by lactation stage.

Significant effect (p ≤ 0.05) of calve sex in milk lipids, protein and freezing point, the highest values were in milk of dams that calved female (7.83 g / l ,3.92 g / l and -27.36c°) respectively.

Lactose and density were increased significantly (p ≤ 0.05) in the milk of dams that calved male its about 4.62 g / l and 53.17 ml / gm respectively.

S.N.F, calcium, ash and water were not affected significantly by calve sex.