Global ETD Search
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 8 of 8 for “"first service conception"”.
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Heritability and repeatability estimates of first service conception and first cycle calving in Angus cattle
… and therefore slow rates of genetic gain. First service conception (FSC) is a binary trait that describes the outcome of the first service of artificial insemination (AI) with success or failure phenotypes. Furthermore, a trait termed first cycle calving (FCC) describes the ability of a …
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Reproductive performance of Holstein cows treated with prostaglandin F2a, gonadotropin releasing hormone, and recombinant bovine Somatotropin
… and recombinant bovine somatotropin (rbST) on conception rates following a timed insemination (TAI) protocol in lactating dairy cows. A further objective included the evaluation of the efficacy of the Early Conception Factor (ECF) test kit. Recombinant bST may offer some benefit when used in …
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An Analysis of Body Condition Scores, Ultrasonographic Fat Thickness, and the Interaction Between the Two on Conception Rates in Yearling Cross-Bred Heifers
… 13-17 months of age were used in an analysis of conception rates through three estrous cycles. Cattle were estrus synchronized and artificially inseminated through two estrous cycles then pasture exposed to reproductively sound Branvieh bulls. Body condition scores (BCS), ultrasonographic fat …
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Simulation of genetic control of reproduction in beef cows
… reproductive performance. Parameters for single-service conception rate and days from calving to first service (postpartum interval) were developed from the literature. Estimates of the heritability and repeatability (h², t) of each of these traits in four simulated data sets were RUN1 (.20, …
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Synchronization of estrus, conception rate, and embryonic mortality in beef cattle following treatment with progesterone-releasing intravaginal devices or melengestrol acetate in conjunction with PGF₂α
… of the estrous cycle on estrous response (ER), first service conception rates (CR), pregnancy rates (PR), and embryonic mortality (EM) after 25 d of gestation. Angus or Angus crossbred cattle (n=391) at two locations were assigned to receive either melengestrol acetate for 7 d (MGA-PGF; .5 …
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The effects of protein supplementation on performance of beef cattle grazing native mixedgrass range in western Kansas
… pubertal before ovulation synchronization, first service conception rates, and final pregnancy rates were not affected (P > 0.40) by treatment. Under the conditions of our study supplemental CP fed at a rate of approximately 0.56 kg daily was sufficient to promote growth and BCS change …
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Effect of pulmonary arterial pressure and precipitation on reproductive performance in Angus heifers in south central Wyoming
… year, yearling year, yearling weight (YW), PAP, first service conception (FSC), overall heifer pregnancy (HPG) and sire. Precipitation data were sourced from the National Oceanic and Atmospheric Administration (https://www.ncdc.noaa.gov/cag/county/time-series, March 3, 2021). From these data, …
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Impact of early postpartum uterine disease (metritis) on the functional regeneration of endometrial glands in lactating dairy cows
… in lactating dairy cows remains suboptimal, with first service conception rates ranging between 30 percent to 40 percent (Fricke and Wiltbank, 2022; Sartori et al., 2023), mostly attributed to early lactation disorders that contribute to early embryonic loss (Ribeiro et al., 2016a; Wiltbank et …