Preventive Effects of New Type of Calcium Supplement on Postpartum Hypocalcemia and Ketosis of Dairy Cows
This experiment aimed to study the preventive effects of new type of calcium supplement on postpar-tum hypocalcemia and ketosis of dairy cows.A total of 60 healthy parous Holstein peripartum dairy cows were randomly divided into 2 groups with 30 dairy cows in each group,which with 15 second pregnancy dairy cows and 15 third pregnancy and over third pregnancy dairy cows.Cows in the experimental group were given the new type of calcium supplement when calving,and cows in the control group were given the commonly used calcium supplement;the second pregnancy dairy cows were given 1 tube/head when calving,and the third pregnancy and over third pregnancy dairy cows were given once more 1 tube/head after calving 12 h.The cau-dal vein blood samples were collected at 1,4 and 8 h after given calcium supplementation,and extra caudal vein blood samples were collected at 12,16 and 20 h for the third pregnancy and over third pregnancy dairy cows.The blood mineral element contents,blood gas indexes,and blood biochemical indexes were measured,and the average milk yield within 7 days postpartum and incidence rate of postpartum diseases within 21 days postpartum were recorded.The results showed as follows:1)after given the two kinds of calcium supple-ments,the blood ionized calcium(iCa)content at 1 to 8 h after calving of all dairy cows showed an increasing trend,and the blood iCa content at 8 to 20 h after calving of the third pregnancy and over third pregnancy dairy cows of the experimental group was significantly higher than that at 1 h after calving(P＜0.05).The blood magnesium ion(Mg2+)content at 8 h after calving of all dairy cows of the experimental group was significant-ly higher than that of the control group(P＜0.05).2)The blood base excess(BE)content at 8 h after calving of the second pregnancy dairy cows of the control group was significantly higher than that of the experimental group(P＜0.05).The blood hydrogen carbonate(HCO3-)content at 8 to 20 h after calving of the third preg-nancy and over third pregnancy dairy cows of the experimental group was significantly higher than that at 1 h after calving(P＜0.05),and the blood HCO3-content at 4,8 and 20 h of the control group was significantly higher than that at 1 h after calving(P＜0.05).3)The blood non-esterified fatty acids(NEFA)content of the second pregnancy dairy cows of the control group was significantly decreased with time increased(P＜0.05),and the blood NEFA content at 4 to 20 h after calving of the third pregnancy and over third pregnancy dairy cows of 2 groups was significantly higher than that at 1 h after calving(P＜0.05).The blood glutamyl transpeptidase(GGT)activity at 1,4 and 8 h of the second pregnancy dairy cows of the experimental group was significantly lower than that of the control group(P＜0.05),and the blood GGT activity at 4 to 20 h after calving of the third pregnancy and over third pregnancy dairy cows of the experimental group was significantly higher than that at 1 h after calving(P＜0.05).4)The average milk yield of the second pregnancy dairy cows of the experimental group was significantly higher than that of the control group(P＜0.05),and the incidence rate of ketosis of the experimental group was significantly lower than that of the control group(P＜0.05).In summary,given the new type of calcium supplement for dairy cows with different parities is beneficial to the prevention of postpartum hypocalcemia and ketosis,reducing the incidence rate of ketosis,and decreasing the impact of calving stress on the performance of dairy cows.[Chinese Journal of Animal Nutrition,2024,36(4):2445-2456]
万方数据
维普
