Abstract
A detailed clinical-endocrine investigation was performed in 6 repear breeder heifers (RBH) with the aim being to ascertain whether endocrine asynchronism exists at luteal regression and during early pregnancy. The heifers were first studied during an open cycle and then after insemination when 3 heifers became pregnant. Circulating plasma levels of PGF2 α metabolite were measured every 2nd h, while progesterone (P4) levels were measured every 6th h. The oestrous period and intervals between the onset of oestrus and ovulation were relatively longer, compared with what is normally seen in heifers. Plasma levels of P4 at the onset of oestrus were higher than normal, but it was concluded that the plasma levels of PGF2 α metabolite and P4 in RBH at luteal regression and early pregnancy were normal.
Sammanfattning
Till försöket användes 6 kvigor som tidigare inseminerats 3–10 ggr. och därefter löpt om med normalt brunstintervall. Djuren studerades kliniskt och endokrinologiskt under 2 sexualcykler, varav den ena efter insemination.
Plasmanivåer av prostaglandin F2α metabolit mättes varannan timme och progesteron (P4) var sjätte timme under luteolysen eller under motsvarande tid efter insemination.
Brunsten och intervallet från brunstens början till ägglossningen var längre än vad som vanligen ses hos kvigor, de 3 kvigorna som blev dräktiga inseminerades 1–3 ggr. med 24 timmars intervall tills ägglossningen konstaterats. Plasmanivån av P4 vid brunstens början var högre än vad som vanligen ses hos kvigor, däremot bedömmdes nivån av prostaglandin F2α metabolit och P4 under luteolys och tidig dräktighet att ej skilja sig från vad som vanligen ses hos nötkreatur. Skötseln av djuren diskuteras som en orsak till omlöparsyndromet.
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Albihn, A., Shamsuddin, M., Qunshan, H. et al. Plasma Levels of Prostaglandin F2α Metabolite and Progesterone in Repeat Breeder Heifers. Acta Vet Scand 32, 361–371 (1991). https://doi.org/10.1186/BF03546966
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DOI: https://doi.org/10.1186/BF03546966