2010
DOI: 10.1590/s1516-35982010001300042 View full text |Buy / Rent full text
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Abstract: Fertility of dairy cattle is generally decreasing. Overall estrus detection efficiency in lactating dairy cattle is low, as expression of estrus is often compromised. Consequently, undetected estrus, low AI-submission rates, and long inter-breeding intervals are the main contributors to poor reproductive efficiency. Although failure to become pregnant is the most common reason for culling dairy cattle, pregnancy rates could be improved by increasing the AI-submission rate through increased estrus detection eff… Show more

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“…Hormonal treatments have been developed to synchronize the time of ovulation, allowing the use of fixed TAI that does not require detection of estrus. The TAI protocol is commonly referred to as ovsynch and this consists of hormonal treatments of gonadotropin-releasing hormone (GnRH) (day 0), prostaglandin F2α (day 7) and GnRH (day 9) and artificial insemination is being performed 16-20 h after second GnRH treatment [ 68 ]. The ovysynch protocol can successfully synchronize ovulation in buffaloes and can also increase conception rate when combined with TAI [ 69 ].…”
Section: Mitigation Strategies To Combat Heat Stressmentioning
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rupbmjkragerfmgwileyiopcupepmcmbcthiemesagefrontiersapsiucrarxivemeralduhksmucshluniversity-of-gavle
“…Hormonal treatments have been developed to synchronize the time of ovulation, allowing the use of fixed TAI that does not require detection of estrus. The TAI protocol is commonly referred to as ovsynch and this consists of hormonal treatments of gonadotropin-releasing hormone (GnRH) (day 0), prostaglandin F2α (day 7) and GnRH (day 9) and artificial insemination is being performed 16-20 h after second GnRH treatment [ 68 ]. The ovysynch protocol can successfully synchronize ovulation in buffaloes and can also increase conception rate when combined with TAI [ 69 ].…”
Section: Mitigation Strategies To Combat Heat Stressmentioning
“…(P4: progesterone, GnRH: gonadotropin-releasing hormone, FSH: follicle-stimulating hormone, PGF2α: prostaglandin F2α, FTAI: fixed-time artificial insemination). ) [ 3 , 6 ]. First, the progesterone device (1.38 g, Eazi-Breed CIDR, Zoetis, Parsippany, NJ, USA) was placed intravaginally (day 0), and later gonadotropin-releasing hormone (10 µg, Buserelin Acetate, Receptal, MSD, Kenilworth, NJ, USA) was intramuscularly injected (day 6).…”
Section: Methodsmentioning
“…Estudos mostram que a baixa capacidade de emprenhar e manter a gestação das vacas em lactação são as principais razões para o descarte em rebanhos leiteiros, porém essa taxa de prenhez pode ser melhorada com o aumento da eficiência da IA pela melhoria da eficiência de detecção de estros, juntamente com a IATF 4 …”
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