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  • Title: The effect of prostaglandin F(2α) administration at the time of insemination on the pregnancy rate of dairy cows.
    Author: Gabriel HG, Wallenhorst S, Dietrich E, Holtz W.
    Journal: Anim Reprod Sci; 2011 Jan; 123(1-2):1-4. PubMed ID: 21167663.
    Abstract:
    This paper addresses the question whether the pregnancy rate of dairy cows and heifers may be affected by administering prostaglandin F(2α) at the time of artificial insemination. A field trial involving 1031 dairy cows and heifers distributed to a large number of small dairy farms in an area of extensive farming in central Germany provided evidence that intramuscular administration of 25mg Dinoprost (Dinolytic(®)) at the time of insemination has no effect on pregnancy rate (61% of the cows and heifers were pregnant in both prostaglandin F(2α)-treated and saline control groups). On the other hand, deposition of 0.5mL of a 0.5mg/mL Dinoprost solution in the uterine lumen immediately after artificial insemination gave rise to a pregnancy rate of 66% as compared with 59% in saline controls. The increase in pregnancy rate of 229 prostaglandin F(2α)-treated animals (66% pregnant) over that of 226 saline controls (59% pregnant) amounted to 12%. This improvement was not statistically significant (P=0.12). Factors exerting a significant effect on pregnancy rate were parity (74% pregnancies in heifers versus 57% in cows, P<0.01 and 65% pregnancies in first parity-cows versus 55% in older cows, P<0.01) and season (57% during the barn season versus 64% during the pasture season, P<0.05), whereas length of service period, level of milk production and serum or milk progesterone level at the time of insemination did not. A follow-up trial involving more animals will have to be conducted aimed at confirming the promising results obtained by intrauterine PGF(2α) administration.
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