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- W2006014062 abstract "Data on fertilisation and embryo quality in dairy cattle are presented and the main factors responsible for the low fertility of single-ovulating lactating cows and embryo yield in superovulated dairy cattle are highlighted. During the past 50 years, the fertility in high-producing lactating dairy cattle has decreased as milk production increased. Recent data show conception rates to first service to be approximately 32% in lactating cows, whereas in heifers it has remained above 50%. Fertilisation does not seem to be the principal factor responsible for the low fertility in single-ovulating cows, because it has remained above 80%. Conversely, early embryonic development is impaired in high-producing dairy cows, as observed by most embryonic losses occurring during the first week after fertilisation. However, in superovulated dairy cattle, although fertilisation failure is more pronounced, averaging approximately 45%, the percentage of fertilised embryos viable at 1 week is quite high (>70%). Among the multifactorial causes of low fertility in lactating dairy cows, high feed intake associated with low concentrations of circulating steroids may contribute substantially to reduced embryo quality. Fertilisation failure in superovulated cattle may be a consequence of inappropriate gamete transport due to hormonal imbalances." @default.
- W2006014062 created "2016-06-24" @default.
- W2006014062 creator A5052973923 @default.
- W2006014062 creator A5068420345 @default.
- W2006014062 creator A5011218469 @default.
- W2006014062 date "2010-01-01" @default.
- W2006014062 modified "2023-10-03" @default.
- W2006014062 title "Factors affecting fertilisation and early embryo quality in single- and superovulated dairy cattle" @default.
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- W2006014062 doi "https://doi.org/10.1071/rd09221" @default.
- W2006014062 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20003858" @default.
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