In order to study the differences of productive performances and serum biochemical indices between primiparous and mulitiparous dairy cows during the perinatal period,ten primiparous and ten multiparous healthy dairy cows were selected and were fed the same total mixed ration.Blood samples were collected from the caudal vein before the morning feeding on-7,-4,-2,-1,0,1,2,4,7and 14 dafter parturition,and serum glucose,triglyceride and calcium concentrations were determined.Milk yields were recorded every day from 11 to 40days after parturition.Milk samples were collected from each experimental cow on 30 th day after parturition and milk compositions and somatic cell counts were determined.The results indicated that no significant difference was observed in serum triglyceride,milk fat,milk protein,milk lactose and milk dry matter between primiparous and multiparous dairy cows（P〈0.05）.Mutiparous cows had greater daily milk yield and higher milk somatic cell count than primiparous cows（P〈0.05）.Primiparous cows had significant higher serum glucose level on-4,2and 4dafter parturition（P〈0.05）,but significant lower serum glucose level on calving date（P〈0.05）when compared with multiparous cows.Higher serum calcium concentrations were found on-2,-1and 2dafter parturition in primiparous cows than multiparous cows（P〈0.05）.
China Animal Husbandry ＆ Veterinary Medicine
primiparous dairy cow
multiparous dairy cow
serum biochemical indices