Following a positive pregnancy diagnosis, late embryonic and early foetal loss is becoming the most common complication of gestation in high producing dairy herds in north-eastern Spain. The authors present the data published during the period of 1996 to 2008, analysing the effects of factors of non-infectious nature affecting late embryonic and early foetal loss in high producing dairy herds. The results included a total of 15,525 pregnancies in well-managed, commercial, Holstein-Friesian high producing dairy herds over the period 1987 to 2007. Since the effects of different factors practically did not vary throughout the years, data from the different studies were pooled and the relative risk of every individual factor on foetal loss is described. Strong risk factors for pregnancy loss were parity (lactating cows versus heifers), the semen-providing bull, warm season and twin pregnancies, whereas the presence of an additional corpus luteum was identified as a strong positive factor favouring the maintenance of gestation. Progesterone and GnRH treatment had the potential to reduce the incidence of pregnancy loss in cows with one or more corpora lutea, respectively, in herds with high incidence of early foetal loss of noninfectious nature. From practical point of view, assessment of normal development of gestation on days 60 and 90 after insemination is suggested.
|Translated title of the contribution||Factors of non-infectious nature affecting late embryonic and early foetal loss in high producing dairy herds in north-eastern spain|
|Number of pages||17|
|Journal||Magyar Allatorvosok Lapja|
|Publication status||Published - Oct 8 2009|
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