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 10 of 10 for “"Timed AI"”.
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Evaluation of the 5-day vs. 7-day Co-Synch + CIDR protocol in dairy heifers using timed AI.
… response to GnRH; and pregnancy outcomes. Dairy heifers (n = 545) from three locations (Florida, Kansas, and Mississippi) were assigned randomly to each of two treatments: 1) 25 mg of PGF2α injection and insertion of previously used autoclaved CIDR on d 7 followed by 100 µg of GnRH …
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Fertility after timed artific[i]al insemination in response to a Controlled Internal Drug Release (CIDR) insert in lactating dairy cows
Lactating dairy cows from 2 Kansas farms were used to determine the effectiveness of exogenous progesterone in the form of an intravaginal insert (controlled internal drug release; CIDR) in conjunction with an ovulation-synchronization protocol. Cows were enrolled in a Presynch + Ovsynch protocol …
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Methods of fertility enhancement and control of beef females
… 12 and removed on day 21 after the initial SMB timed artificial insemination (AI). This treatment resulted in an increase in the calving rate to the initial SMB timed AI in beef heifers (P $<$.01), but had no effect on calving rates of post-partum beef cows. Following implant removal on day 21, …
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Efficacy of Synthetic Gonadotropin Releasing Hormone Analogs for Control of Ovulation During Estrus Synchronization Protocols
… gonadorelin hydrochloride), for use in beef timed AI synchronization. In Experiment one 342 beef cows from 7 herds were assigned CYS or FAC treatment as part of the Ovsynch protocol (GnRH d 0 and 9, Lutalyse d 7). Cattle treated with FAC had greater tendency (P=.09) to be pregnant at d 45. …
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Evaluation of systematic breeding programs in lactating dairy cows
… for effective reproductive management of a dairy herd. However, increasing herd sizes can lead to reproductive inefficiency resulting in decreased profits on dairy herds. Synchronization of estrus, through pharmacological control, has been used to improve reproductive efficiency. Systematic …
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Presynchronizing injections of prostaglandin F[subscript]2alpha[subscript] or prostaglandin F[subscript]2alpha[ subscript + Gonadotropin-releasing hormone before a fixed time artificial insemination CO-Synch + CIDR program in suckled beef cows
… on d -3, and 100 mcg GnRH i.m. [GnRH-2] and timed AI [TAI] on d 0) in suckled beef cows. This hypothesis was tested in 2 experiments, in which cows were treated with either PG or PG + GnRH before initiating a control CO-Synch + CIDR program to increase the proportion of cows starting the …
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Reproductive performance of Holstein cows treated with prostaglandin F2a, gonadotropin releasing hormone, 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 conjunction with estrus …
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CHARACTERIZATION OF SENSOR AND NON-SENSOR COW, HERD MANAGEMENT, AND ENVIRONMENTAL DATA AND USE OF MACHINE LEARNING ALGORITHMS FOR PREDICTION OF PREGNANCY IN DAIRY CATTLE
… first service (FS) after calving in lactating dairy cows. The specific objective of the study presented in Chapter I was to compare patterns of multiple cow behavioral, physiological, and performance parameters collected by automated sensors before insemination for cows that became pregnant or …
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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
… conducted to evaluate the efficacy of a delayed timed AI (TAI) protocol. The objective was to evaluate the use of Estrotect patch status to determine optimum TAI implementation. Experiment 1 was conducted with, 997 cows across 6 locations were administered a 7-d CO-Synch + controlled internal …
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Trace mineral supplementation in cattle: Implications in heifer development, reproductive performance, and fetal programming
… may improve growth, reproduction, and health traits in ruminants. To evaluate the effect of supplementing two different chelated trace mineral sources on reproductive performance of beef cows, 204 spring-calving, Angus and Simmental × Angus cows [body weight (BW) = 649 ± 129 kg] were utilized. …