الكاتب: Multiple References

The present study was conducted to investigate the blood biochemical profile in cyclic and acyclic Friesian Cows under northern Egyptian conditions. Twenty Friesian lacting cows, 5-7 years in age, were divided into two equal groups, the first included cycling cows while the second included acycling or anoestrous cows. Blood samples were withdrawn from all experimental animals. Plasma was separated and kept at ñ20ºC until biochemical analysis. Plasma creatinine, cholesterol, total proteins, albumin, globulin, glucose, calcium, phosphorus, sodium, potassium, chloride, GOT, GPT, and alkaline phosphatase were analyzed. Results revealed that in cyclic cows the levels of cholesterol, total proteins, albumin, globulin, glucose, calcium, sodium, potassium, chloride, GOT, GPT and alkaline phosphatase were significantly higher than those in acyclic cows. There was no significant differences in the levels of creatinine and phosphorus between the two groups. These changes could be attributed to ovarian activity.