Relationship between rainfall and Neospora caninum-associated abortion in two dairy herds in a dry environment
Santolaria Blasco, Pilar
Yániz Pérez de Albéniz, Jesús
López Bejar, M.
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The possible direct relationship between climate variations and abortion in Neospora caninum-infected cows has not been studied. The objective of this study was to determine whether climate changes could be a risk factor for abortion in N. caninum-infected cows, and was based on yearly serological screening for neosporosis and on the confirmation of N. caninum infection on aborted fetuses in two high-producing dairy herds with a mean 27% seroprevalence of N. caninum antibodies. The final population study was comprised of 357 pregnancies in seropositive animals. Logistic regression analysis indicated no significant effects of herd, N. caninum antibody titre, climate variables during the first and third trimesters of gestation, mean and maximum temperature– humidity index values during the second trimester of gestation, and previous abortion on the abortion rate. Based on the odds ratio, a 1-unit increase in lactation number yielded a 0.85-fold decrease in the abortion rate. The likelihood of abortion was 1.9 times (1/0.54) lower for pregnant cows inseminated with beef bull semen compared with Holstein-Friesian bull semen. The likelihood of abortion decreased significant and progressively by factors of 0.5, 0.41 and 0.3 for the respective classes 40–49, 30–39 and <30 rainfall mm during the second trimester of gestation (using the class ‡60 rainfall mm as reference). As a general conclusion, it seems that increased rainfall in a dry environment can compromise the success of gestation in N. caninum-infected cows. Attempts should therefore be made to reduce environment effects during the second trimester of gestation, a period in which the immune response of cows is diminished.
Is part ofJournal of Veterinary Medicine, Series B, 2005, vol. 52, núm. 3, p. 147-152
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Almería, S.; López Gatius, Fernando; García Ispierto, Irina; Nogareda, Carmina; Bech Sàbat, Gregori; Serrano, Beatriz; Santolaria Blasco, Pilar; Yániz Pérez de Albéniz, Jesús (Elsevier, 2009)Previous studies have shown that the use of beef bull semen significantly reduces the rate of abortions due to Neospora caninum in artificially inseminated (AI) seropositive dairy cows. In addition, certain beef breeds ...
Santolaria Blasco, Pilar; López Gatius, Fernando; Yániz Pérez de Albéniz, Jesús; García Ispierto, Irina; Nogareda, Carmina; Bech Sàbat, Gregori; Serrano, Beatriz; Almería, S. (Elsevier, 2009)This study was designed to assess the reproductive performance of Neospora caninum–infected dairy cows (Bos taurus) after abortion. The population examined was composed of 92 aborting cows subsequently subjected to at ...
Progesterone supplementation during mid-gestation increases the risk of abortion in Neospora-infected dairy cows with high antibody titres Bech Sàbat, Gregori; López Gatius, Fernando; Santolaria Blasco, Pilar; García Ispierto, Irina; Pabón, M.; Nogareda, Carmina; Yániz Pérez de Albéniz, Jesús; Almería, S. (Elsevier, 2007)Progesterone has been reported to reduce Th1 responses during pregnancy. Thus, given that an excessive Th1 response could lead to abortion in Neospora-infected dairy cows, we hypothesized a reduction in abortion risk ...