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dc.contributor.authorLópez Gatius, Fernando
dc.contributor.authorGarcía Ispierto, Irina
dc.contributor.authorHunter, Ronald Henry Fraser
dc.description.abstractMultiple pregnancies have devastating consequences on the herd economy of dairy cattle. This observational study examines incidence patterns based on data from the ultrasonographic examination of 1130 multiple pregnancies in cows in their third lactation or more carrying twins (98.8%), triplets (1.1%), or quadruplets (0.08%), and 3160 of their peers carrying singletons. Cows became pregnant following a spontaneous estrus with no previous hormone treatments. Irrespective of a significant decrease (p < 0.0001) in the conception rate (28–34 days post-insemination) during the warm period of the year, the multiple pregnancy rate was similar for both warm (26.5%) and cool (26.3%) periods. The incidence of unilateral multiple pregnancies (all embryos in the same uterine horn) was higher than that of bilateral pregnancies (at least one embryo in each uterine horn): 54.4% versus 45.6% (p < 0.0001). This difference rose to 17% during the warm season (p = 0.03). Pregnancy was monitored in unilateral multiple pregnancies until abortion or parturition (n = 615). In the warm period, the parturition rate was 43% compared to 61% recorded in the cool period (p < 0.0001). Thus, a warm climate is the main factor compromising the fate of multiple pregnancies. Some clinical suggestions are provided.ca_ES
dc.relation.isformatofReproducció del document publicat a:
dc.relation.ispartofAnimals, 2020, vol. 10, núm. 11, article 2165ca_ES
dc.rightscc-by, (c) López Gatius, Fernando et al., 2020ca_ES
dc.subjectDead co-twinca_ES
dc.subjectEarly fetal lossca_ES
dc.subjectTwin reductionca_ES
dc.subjectBilateral asymmetryca_ES
dc.subjectHeat stressca_ES
dc.titleTwin Pregnancies in Dairy Cattle: Observations in a Large Herd of Holstein-Friesian Dairy Cowsca_ES

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cc-by, (c) López Gatius, Fernando et al., 2020
Except where otherwise noted, this item's license is described as cc-by, (c) López Gatius, Fernando et al., 2020