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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 100 for “"pregnancy rates"”.
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The Effect of Prostaglandin Inhibitor on Pregnancy Rates of Heifer Embryo Transfer Recipients
… of prostaglandin, which may, in turn, reduce pregnancy rates in embryo recipients. Administration of a prostaglandin inhibitor prior to embryo transfer improves pregnancy rates in cows. Embryo transfer into heifers is more difficult and often requires additional manipulation of the uterus. …
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Effects of ovulation-inducing drugs on pregnancy rates of cattle in rural areas after synchronized oestrus and artificial insemination
… used to increase the ovulation rate, therefore pregnancy rates, when injected intramuscularly at the time-of artificial insemination (Al). Frozen-thawed Bonsmara and Nguni semen was used in synchronized cows of different ages, breeds and body condition scores (BCS). The main objective of this …
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Comparison of pregnancy rates, progesterone concentrations, and expression of genes associated with progesterone synthesis in heifers and mature cows
… in dairy cattle but at the same time fertility rates have steadily declined, particularly in mature cows. Fertility of heifers that were bred for the first time has not been affected. One of the major reasons for such fertility decline in mature cows could be impaired progesterone production. …
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Effect of Timing of Insemination and Synchronization of Estrus Method on Artificial Insemination (AI) Pregnancy Rates in Beef Heifers
… (PG) or progesterone insert (CIDR) plus PG on AI pregnancy rate in beef heifers (n = 662) during Fall or Spring. Fall heifers (n = 349) received MGA-PG (MGA for 14 d followed by PG on d 18) or CIDR-PG (CIDR for 7 d, PG administered 1 d before CIDR removal). Estrus was monitored by HeatWatch® (n = …
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Effect of delaying time of AI based on Estrotect patch status on pregnancy rates of beef heifers and nursing beef cows
… was no treatment x location interaction for pregnancy rate (P = 0.96), so data were pooled across locations. There was a tendency (P = 0.07) for an interaction between the main effects for pregnancy rate. Pregnancy rate was greater (P < 0.01) in cows with activated patches at 58 h post PGF2α …
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Comparing Teenage Pregnancy Rates and Teenage Birth Rates Between States that Do and Do Not Mandate Sex or STD/HIV Education Programs
In 2005, the teenage pregnancy rate increased for the first time in almost a decade. There are several negative outcomes associated with teenage pregnancy such as adverse health effects for mothers and infants and increased spending on welfare programs. The purpose of the study is to determine if …
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Comparison of Luteolysis and Timed Artificial Insemination Pregnancy Rates after Administration of PGF2a in the Muscle or the Ischiorectal Fossa in Cattle
… of a 7-Day CO-Synch + CIDR ovulation protocol. Pregnancy diagnosis was performed via ultrasound at 60 days post insemination. Results were analyzed with Proc Glimmix (SAS). Pregnancy rates for neck and IRF injections were 52.6% and 57.2%, respectively (p=0.06). In summary, injection of PGF2α in …
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The impact of GnRH-agonist triggers on autologous in vitro fertilization outcomes: A retrospective analysis
… a condition that can be life threatening. Lower pregnancy rates have been reported in the literature with the GnRH-agonist trigger, leading to recommendations of elective embryo cryopreservation, delayed transfer and increased costs to the patient. AIM: To determine if intensive luteal phase …
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Effect Of A Cidr Insert And Flunixin Meglumine Administered At The Time Of Embryo Transfer On Pregnancy Rate And Resynchronization Of Estrus In Beef Cattle
… device (CIDR) at the time of ET on pregnancy rates (PR) and the resynchronization of estrus. Beef cows (n = 796) and heifers (n = 108) at three locations were assigned randomly within age to one of four groups in a 2 x 2 factorial arrangement of treatments with injection of FM (500 …
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Comparison of controlled internal drug release (CIDR)-based protocols to synchronize estrus and facilitate artificial insemination (AI) in postpartum beef cows
… any differences in synchronized conception or pregnancy rates resulting from AI. Experiment 2 was designed to compare pregnancy rates resulting from fixed-time AI following administration of the 7-d and 5-d CO-Synch + CIDR protocols with FTAI at 66 and72 h. There was no effect of treatment, …
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Induced Cervical Dilation in Sheep: Evaluation of the Effects on Fertilization Rates and Embryonic Development
… for transcervical AI and embryo transfer on pregnancy or fertilization rates in sheep. Experiment 1 was conducted as a 2 × 2 factorial, with the main effects of estradiol-17β (E2) and oxytocin (OT). On d 6 of pregnancy, ewes received (i.v.) 100 μg of estradiol-17β, or saline; 10 h later, ewes …
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Prediction of Fertility of Virginia Beef Heifers Using Expert Systems Technology
… and 3GOOD2 had significantly higher observed pregnancy rates than expected for each category. There was no significant difference between observed and expected pregnancy rates for heifers in the 3EXCELLENT2 category. Pregnancy rates for post-weaning and pre-breeding evaluations for the 3LOW2 …
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Strategies to improve fertility of Bos taurus beef females enrolled in estrous synchronization protocols
… inseminated immediately or delayed by 8 hours. Pregnancy rates were greater for cows expressing estrus to the protocol. Delaying AI for 8 hours in cows that failed to express estrus did not improve pregnancy rates. The effects of temperament on fertility of beef heifers enrolled to the 7-d …
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No More Baby Steps: Preventing Unintended Pregnancies of Los Angles Minorities and Adolescents
<p>Previous studies have identified pregnancy intention to correlate with both maternal and fetal health. Though unintended pregnancy rates are dropping in America, they remain high among minority and young women. Contraceptive usage, a leading protective factor for unintended pregnancies, has been …
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Evaluation of long-term CIDR-based estrus synchronization protocols in primiparous two-year-old beef cows
… for beef producers to increase retention rates, reduce input costs, and ultimately enhance production efficiency. Estrus synchronization and artificial insemination (AI) are important management tools available to producers that facilitate genetic improvement and enhance reproductive …
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Trace mineral supplementation in cattle: Implications in heifer development, reproductive performance, and fetal programming
… comparted to MAAC cattle at the time of final pregnancy confirmation. There was no effect (P = 0.91) of supplementation on artificial insemination (AI) conception rate (MAAC=72.2% and TRAX=71.2%). Interestingly, overall pregnancy rate was greater (P = 0.03) for TRAX (98.4%) compared to their …
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Utilization of early weaning and intrafollicular insemination as methods to improve the reproductive performance of cattle
… age at puberty, EW heifers tended to have higher pregnancy rates than NW heifers. A progesterone clearance analysis revealed that EW heifers also have greater ability to metabolize progesterone. This altered progesterone metabolism could be a direct result of changes in metabolism caused by …
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Homologe intrauterine Insemination (IUI) im stimulierten Zyklus : Bedeutung von Spermiogrammparametern in Nativ-Spermiogrammen und nach Ejakulat-Aufbereitungen
… and after preparation do have an impact on the pregnancy rate after intrauterine insemination (IUI). If possible, a threshold was established beyond which the probability of success after IUI would decrease distinctly. The calculated pregnancy rate was 23,6% per couple and with that only …
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Systematic review: Availability, effectiveness and safety of assisted reproductive techniques in Sub-Saharan Africa
… and utilization of ART are very low, clinical pregnancy rates largely compare to other regions but are accompanied by high multiple pregnancy rates, and in the near absence of data on deliveries and live births the true degree of effectiveness and safety remains to be established. WHAT IS KNOWN …
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Evaluation of systematic breeding programs in lactating dairy cows
… other breeding protocols. First AI conception rates did not differ among control, 14-d PGF2a, or GnRH-PGF2a protocols, but were higher than the TAI protocol. However, first AI pregnancy rates were higher for untreated controls versus hormonally treated cows. Estrus characteristics associated …
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