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Synchronization of Oestrus in Heifers with Norethisterone
Brunstsynkronisering hos kvigor med hjälp av noretisteron
Acta Veterinaria Scandinavica volume 11, pages 415–426 (1970)
Abstract
Sixty-five heifers in different stages of the oestrus cycle were fed norethisterone once daily for 17 days at doses of 0.2, 0.6 and 1.0 mg/kg body weight.
During treatment swollen vulva, mucus discharge, open and reddened portio and udder enlargement were noted.
Norethisterone was effective in suppressing oestrus and ovulation at doses of 0.6 and 1.0 mg/kg. Extremely good heat-synchronization followed the treatment and 98 % of the heifers came on heat within a two-day period. Fifty-five % conceived after the first insemination. In the group receiving 0.2 mg norethisterone per kg, three out of 13 heifers showed psychic heat during treatment. Poor heat synchronization and low conception rate were obtained in this group.
A possible effect of cycle stage on heat synchronization was noted only in the 0.2 mg group where a better result was obtained when treatment began in the follicular phase.
Sammanfattning
Sextiofem kvigor i olika stadier av brunstcykeln utfodrades med noretisteron — 0,2, 0,6 och 1,0 mg per kg kroppsvikt, en gång dagligen i 17 dagar.
Under behandlingen iakttogs svullen vulva, slemflytning, öppen och rodnad pörtio samt juverförstoring.
Noretisteron, 0,6 och 1,0 mg per kg, hämmade effektivt brunst och ovulation. Mycket god brunstsynkronisering följde på behandlingen och 98 % av kvigorna blev brunstiga inom en tvådagars period. Femtiofem procent blev dräktiga efter första inseminationen. I gruppen som fick 0,2 mg noretisteron per kg visade 3 av 13 kvigor psykisk brunst under behandlingen, som åtföljdes av dålig brunst synkronisering och låg fertilitet.
En möjlig effekt av cyklusstadiet på brunstsynkroniseringen framkom endast i 0,2 mg gruppen där bättre resultat erhölls när behandlingen började i follikelfas.
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Acknowledgment
The author wishes to express his thanks to Svensk Husdjurssköt- sel, Hållsta and Svenska Lantmännens Riksförbund, Stockholm for financial support of the work and to A.B. Astra, Södertälje for supplying norethisterone.
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Åström, G. Synchronization of Oestrus in Heifers with Norethisterone. Acta Vet Scand 11, 415–426 (1970). https://doi.org/10.1186/BF03547968
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DOI: https://doi.org/10.1186/BF03547968