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• W2100157417 abstract "This prospective and randomised experiment was designed to compare the luteotrophic effect of whole versus half embryos and, to evaluate the relationship between the plasma progesterone (P4) profiles and the rates of early embryonic (from Days 7 to 25), late embryonic (Days 25–42) and foetal (Days 42–63) mortalities of whole and half embryo recipients. Within a single herd, 188 virgin, healthy, cyclic, reproductively sound, with adequate body condition score, Holstein dairy heifers were randomly allocated to receive one whole or one half embryo on Day 7 of the oestrous cycle (Day 0 = estrus). In each embryo-transfer (ET) group, half of the recipients were treated with a CIDR (controlled internal drug releasing device) between Days 7 and 19. Pregnancy was evaluated by ultrasound on Days 25, 42 and 63 and plasma P4 profiles were obtained until Day 63 of pregnancy. CIDR-treated and untreated heifers had similar pregnancy rates on Days 25, 42 and 63 and, embryo size on Day 42 was also similar in treated and untreated recipients. Therefore, CIDR treatment failed to promote growth and survival of half and whole embryos. Half embryos presented a significantly higher rate of early and late embryonic mortality than whole embryos. In contrast, foetal mortality was similar in whole and half embryos and, this was coincidental to a similar embryo size on Day 42. Therefore, half embryos exhibited a compensatory growth until Day 42, irrespective of CIDR treatment, after which they presented a similar survival rate to that of whole embryos. Half embryo-derived pregnancies presented significantly lower plasma P4 concentrations on Day 25 than whole embryo-derived pregnancies, suggesting that this lower luteotrophic effect of half embryos could be related to their higher rate of late embryonic mortality. No significant relationship between the early luteal P4 concentrations and embryo survival was observed in whole and half embryo recipients. The first detectable luteotrophic effect of embryonic origin was observed on Day 14 and no detectable second luteotrophic effect was observed until Day 63 of pregnancy. Treatment with CIDR significantly increased plasma P4 concentrations during treatment but induced a significant decrease after removal of the device, suggesting that secretion of luteotropins was downregulated in the course of treatment." @default.
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• W2100157417 date "2008-02-01" @default.
• W2100157417 modified "2023-09-26" @default.
• W2100157417 title "Luteotrophic effect, growth and survival of whole versus half embryos and, their relationship with plasma progesterone concentrations of recipient dairy heifers" @default.
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• W2100157417 doi "https://doi.org/10.1016/j.anireprosci.2007.01.004" @default.
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