Postpartum Reproductive Performance in Dairy Cows in Relation to Phosphorus Status

Fruktbarhetsresultater hos ku relatert til fosfornivå

Abstract

The levels of inorganic phosphorus in blood samples from two cow populations were related to reproductive performance. Group I comprised 305 dairy cows from 17 herds with normal fertility. The herds were visited every 2–4 weeks. Blood samples were collected from animals between 4 weeks prior to expected calving and subsequent confirmed pregnancy.

The individual mean plasma phosphorus level in samples collected from 0–90 days after calving in cows which conceived following insemination (n = 262) was related to reproductive performance.

Group II comprised cows from 47 herds with reproductive problems. The herds were visited once during the indoor season for blood sampling. Mean herd serum phosphorus levels were related to herd reproductive performance registered during a period from 6 months before to 9 months after the time of blood sampling. Overall mean herd phosphorus levels were 1.51 ± 0.08 mmol/1 plasma (±SD) (Group I) and 1.77 ± 0.16 mmol/1 serum (±SD) (Group II). In Group I (indivu-dual cows), the coefficient of correlation between phosphorus levels and elapsed time from calving to pregnancy was low (r = 0.10, p<0.1). In Group II (herds) significant correlations were observed between the fertility status index (FS), the average number of days from calving to last insemination and phosphorus levels (rs = 0.32, P <0.05 and rs p <0.05, respectively).

The mean herd phosphorus levels were within normal limits in both groups. Although increased phosphorus levels were associated with lower fertility in both groups, the amount of the total fertility variation which could be explained by phosphorus levels was small.

Sammendrag

Nivåene av uorganisk fosfor ble related til fruktbarhetsresultater i to grupper. Gruppe I omfattet 305 kyr fra 17 besetninger med normale fruktbarhetsresultater. Besetningene ble besøkt hver andre til fjerde uke, og det ble tatt blodprøve fra kyr fra 4 uker før forventet kalving til konstatert drektighet.

Gjennomsnittlig fosfornivå i plasma for prever samlet i perioden 0–90 dager etter kalving hos kyr som ble drektige (n = 262), ble relatert til fruktbarhetsresultatene hos enkeltkyr. Gruppe II omfattet 47 besetninger med fruktbarhetsproblemer. Det ble tatt blodprøver i besetningene en gang i løpet av innefôringsperioden. Fruktbarhetsresultatene for besetningene ble registrert i en periode fra 6 måneder før til 9 måneder etter at blodprøver ble tatt. Gjennomsnittlig fosfornivå for besetningene var 1.51 ±0.08 mmol/l plasma (±SD) (Gruppe I) og 1.77±0.16 mmol/l serum (±SD) (Gruppe II). Det var en tendens til negativ sammenheng mellom fruktbarhet og fosfornivå i Gruppe I. I Gruppe II var det signifikante korrelasjoner mellom FS-tall, gjennomsnittlig avstand fra kalving til siste inseminasjon og fosfornivå (henholdsvis rs = -0.32 p <0.05 og rs = 0.31 p <0.05).

Det blir konkludert med at gjennomsnittsnivåene for fosfor i besetningene i begge grupper var innenfor det normale variasjonsområdet. Selv om det var tendens i begge grupper til en negativ sammenheng mellom fosfornivå og fruktbarhet, var det bare en liten del av den totale variasjon som kunne forklares med fosfornivå.

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Acknowledgments

The authors wish to thank S. R. Eriksen, K. Soren-sen, and B. Johansson for excellent analytical and technical assistance.

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Correspondence to E. Ropstad.

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Ropstad, E., Ormsettrø, S.I. & Refsdal, A.O. Postpartum Reproductive Performance in Dairy Cows in Relation to Phosphorus Status. Acta Vet Scand 29, 347–356 (1988). https://doi.org/10.1186/BF03548628

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Keywords

  • inorganic phosphorus
  • cattle
  • fertility.