Effects of Different Phosphorus Sources on Lactation Performance and Plasma Metabolites of Dairy Cows
This experiment was conducted to investigate the effects of different phosphorus sources on lactation performance and plasma metabolites of dairy cows in late lactation period.Sixty Holstein cows with similar body weight,parity,feed intake and lactation days in late lactation period were randomly divided into 2 groups with 30 cows in each group by a single-factor experimental design.The phosphorus in the diets for dairy cows in the two groups was derived from dibasic calcium phosphate(DCP)and tertiary calcium phosphate(TCP)prepared by high-temperature sintering method,respectively.The main nutrients and the contents of calcium and phosphorus in the two diets were consistent.The experiment lasted for 65 days,including a pre-trial period of 10 days and a trial period of 55 days,during which milk yield was recorded every day.Milk samples were collected and dairy herd improvement(DHI)was performed on days 30 and 65,and blood was collected on day 65 to determine metabolites in plasma.The results showed as follows:1)there were no significant differ-ences in milk yield and milk composition of dairy cows between the two groups(P＞0.05);2)there were no significant differences in plasma alkaline phosphatase activity and contents of calcitonin,parathyroid hormone and calcium of dairy cows between the two groups(P＞0.05),and the plasma phosphorus content in DCP group was significantly higher than that in TCP group(P＜0.05);3)there were 31 different metabolites in plasma of dairy cows under different phosphorus sources,among which carnosine and methylimidazoleacetic acid were up-regulated in TCP group compared with DCP group.The Kyoto Encyclopedia of Genes and Ge-nomes(KEGG)pathway of the differential metabolites was found to be significantly enriched only in histidine metabolism(P＜0.05).In conclusion,under the conditions of this experiment,different phosphorus sources have no significant effects on lactation performance of dairy cows.TCP may improve the utilization of phos-phorus in dairy cows and up-regulate the metabolites related to antioxidant and anti-inflammatory in plasma,which has a positive effect on the health of dairy cows.[Chinese Journal of Animal Nutrition,2024,36(11):7060-7067]
cowsdibasic calcium phosphatetertiary calcium phosphatelactation performancecalcium and phosphorus metabolismplasma metabolites
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维普
