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Showing 1 to 20 of 84 for “"pregnancy rate"”.
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Breed group effects on pregnancy rate and ewe performance in different seasons of the year
Thirty-one Dorset (D), 24 Finnish Landrace (F), 35 Barbados Blackbelly x Dorset (BD), 10 Dorset x Finn (F), 24 Finn x Dorset (FD) and 35 grade Rambouillet (R) ewes were exposed to rams in various seasons. Ewes were born in 1979 or 1980; no R ewes were born in 1980. Ewes were bred in April, 1980 …
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Effect of ovulatory follicle size on luteal function, pregnancy rate, and late embryonic/fetal mortality in beef cattle
… of small dominant follicles resulted in reduced pregnancy rates compared ovulation of large follicles in cattle. A reciprocal embryo transfer approach was used to differentiate between oocyte competence and uterine environment factors that affect establishment of pregnancy following induced …
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Evaluation of 72 h Cosynch and 5 or 7 d post-AI gonadotropin releasing hormone on first service pregnancy rate in lactating dairy cows
… were evaluated in samples collected at five separate times and CL volume and number were recorded at 30 d pregnancy examination for Holstein (n = 77) and Jersey (n = 33) cows. GnRH treatment did not affect PR (Control - 47.2%, 5 d GnRH - 40.5%, 7 d GnRH – 44.7%) or P4, but increased TCLV compared …
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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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Estimation of the Economic Impact of a Unit Change in Predicted Transmitting Ability for Daughter Pregnancy Rate and Other Predicted Transmitting Ability in the Merit Indexes
… impacts of a unit change in PTA of daughter pregnancy rate (DPR) and other PTA in the merit indexes on lifetime profit estimates of a bull's daughters were estimated to determine an economic weight for the PTADPR and other PTA in economic indexes. Records for 71,094 cows born in 1988, 1990, …
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Effect of concentrations of progesterone on follicular development and fertility in beef cows
… were lower in treated versus control cows. Pregnancy rate did not differ between treated and control cows. Pregnancy rate was greater in cows that ovulated a follicle from the right (78%) versus left (52%) ovary (p < 0.01). Low ascending progesterone early in the estrous cycle did not …
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Studies on the factors that improve the outcome of IVF-ET
… be amenable to modification in order to improve pregnancy rates following this form of treatment. To this end I performed a historical review of the advances that have been made in reproductive treatment since before the birth of Louise Brown in 1978, and a retrospective analysis of the result of …
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Strategies for Improving Reproductive Efficiency of Beef Cattle with Assisted Reproductive Technologies
… exposed per bull was negatively correlated with pregnancy rate to natural service on first return to estrus after FTAI in fall herds. The number of open cows per bull in fall herds using one natural service sire was negatively correlated with pregnancy rate on first return to estrus. There was no …
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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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Artificial Induction of Lactation in Nonbreeder Dairy Cows
… induction of lactation yielded a 92% success rate for Holstein cows with success defined as achieving >9 kg milk/d, and a 88% success rate for Jersey cows with success defined as achieving > 5 kg milk/d. Mean accumulated milk yield for induced cows at 150 DIM was 65% of mean yield for …
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Synchronization and Resynchronization of Ovulation and Timed Insemination in Lactating Dairy Cows and Heifers
… 56, or 72 hours (h) after CIDR removal. Overall pregnancy rate (PR) for synchronized heifers was 60.1%, and embryo survival rate (ESR) was 98%. Pregnancy rate for CIDR-ECP treated heifers was influenced by artificial insemination (AI) time. In conclusion, ECP or GnRH may be used effectively in a …
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Interaction of number of boar sperm and insemination timing on fertility following induced ovulation
… for number of sperm (P = 0.06) to affect pregnancy rate with 2.5 billion (87%) inducing a greater pregnancy rate than 1.5 billion sperm (80%). Pregnancy was affected by AI timing (P < 0.05) and was greater (P = 0.002) following insemination at 22 h (85.1%) than 30 h (75%) whereas AI at 26 …
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Associations Among Beef Cattle Genotypes, Neospora Caninum Infection, and Reproductive Performance
… lived and age impacted (P < 0.05) infection rate. Breed composition, number of farm dogs on the ranch, and use of total mixed rations were not associated (P > 0.1) with seropositive tests. Fewer (P < 0.05) seropositive females were pregnant in Oklahoma, but overall infection rate was not …
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Untersuchungen zur verzögerten Ovulation beim Rind
… and to evaluate its influence on the conception rate. The examinations were carried out on 304 animals (293 cows and 11 heifers) of the breeds Swiss Brown (65%), Holstein (26%) and Simmental (9%). The animals were kept on 49 different farms in the area of the Artificial Insemination Center …
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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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Factors affecting fertility in frozen-thawed boar sperm
… methods required to achieve acceptable farrowing rates and litter size. Fertility following AI with frozen-thawed sperm is approaching that of liquid stored sperm, and producers may soon reap the benefits of this technology. This thesis will outline the current swine industry, opportunities for …
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Untersuchungen zur Eignung von Empfängertieren im Rahmen des Embryotransfers
… cycle. The recipients were examined again for pregnancy by ultrasound on day 35 (28 days after the transfer) and by rectal palpation on day 49. A blood sample (plasma) was taken on day 0 (oestrus), 7 (transfer) and 21, in order to mesure the progesterone concentration (P4). An enzyme-based …
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Evidence for a systemic embryotoxic effect of early luteal regression in the ewe
… saline or PGF 2alpha through days 6 or 7. Pregnancy rate was reduced after treatment with PGF2alpha (P < 0.001) compared to controls and was increased in PGF2alpha-treated ewes by lutectomy (P < 0.05). Mated ewes with bilateral ovulations were unilaterally lutectomized, and each uterine …
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Effect of peptidoglycan-polysaccharide complex on reproductive efficiency and mastitis in sheep
… reduce pregnancies in cattle. Effects on pregnancy and incidence of mastitis in sheep were investigated after immunization with peptidoglycan-polysaccharide (PG-PS) and killed cells from Strep. pyogenes. Rambouillet (n = 100) and mixed breed (n = 18) ewe lambs were immunized (∼d42 and …
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Andrological Methods of Predicting the Pregnancy Outcome of an <i>in vitro</i> Fertilization Program
… costly, unpredictable, and often yields a low pregnancy rate. Thus, it would be valuable to devise laboratory procedures for better prediction of IVF outcome.</p> <p>The male infertility rate can be as high as 50%. Since sperm count and percent of motility alone do not appear to be strong …
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