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Showing 1 to 13 of 13 for “"estrous synchronization"”.
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Strategies to improve fertility of Bos taurus beef females enrolled in estrous synchronization protocols
Estrous synchronization (ES) protocols enhances profitability of beef cow-calf operations by improving percentage of cows pregnant early in the breeding season and increasing kg of calf weaned per cow exposed. Many factors, however, influence the fertility of cattle enrolled to ES protocols. The …
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Changes in vaginal microbiome of beef cows enrolled in estrous synchronization protocols and its relation to fertility
Estrus synchronization (ES) is a valuable technology that can help beef cow-calf producers to overcome infertility caused by prolonged anestrus. Protocols for ES that use progesterone (P4) supplementation are of particular value to cows with prolonged postpartum anestrus as P4 triggers them to …
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Nutrient Restriction Effects on Ovulatory Follicle and Corpus Luteum Development and Progesterone Production of Bos taurus Cows
… and function of Bos taurus cows enrolled in estrous synchronization. A total of 26 Angus cows were housed in a facility equipped with a Calan gate system for individual animal intake. Cows were stratified by body weight (BW), and randomly assigned one of two nutritional treatments: 1) 100% of …
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Effects of Feeding Supplemental Eicosapentanoic Acid and Docosahexanoic Acid to Beef Females on Reproductive Responses and Free Fatty Acids
… C concentrates with corn silage from 30 d before estrous synchronization until 14 d after artificial insemination (AI). Serum fatty acid profiles were determined in five heifers from each group . Estrus detection and AI were conducted from d 37 through d 39. Dietary treatment increased (P < 0.05) …
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Artificial Induction of Lactation in Nonbreeder Dairy Cows
… Holsteins and 8 Jerseys) were subjected to an estrous synchronization protocol administering 2 PGF2Æ Ã injections 11 d apart prior to beginning the lactation-induction protocol. Artificial induction of lactation yielded a 92% success rate for Holstein cows with success defined as achieving >9 …
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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
Artificial insemination (AI) and estrous synchronization are reproductive technologies that enable beef producers to efficiently improve herd genetics. The recent development of protocols designed to synchronize estrus and ovulation enable producers to utilize fixed-time AI (FTAI), thus reducing …
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Developing embryo technologies for the eland antelope (Taurotragus oryx)
… blood glucose levels. In Chapter 5, type of estrous synchronization or ovarian stimulation protocol did not affect ovarian response. Animals, but not month of the year, affected ovarian response. In 37 oocyte retrieval procedures using seven females, an average of 12.8 follicles yielded 9.8 …
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Control of endometrial secretion in cattle and production of transgenic swine
… from cows to determine effects of day of the estrous cycle, location of the ovulatory structure and progesterone (P₄) on endometrial protein secretion. Day 0 (estrus) endometrial tissue released more protein than tissue collected on d 9, 14 or 18. Protein synthesis was greater on d 0 and 18 …
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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
… the effects of and/or interactions among estrous synchronization treatments, reproductive status, and stage 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 …
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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
… + controlled internal drug release (CIDR) estrous synchronization protocol. The experimental design was a 2 x 2 factorial; factors were patch status at 58 h post PGF2α injection (activated or inactivated) and time interval from PGF2α to TAI (58 or 76 h). Patch status was characterized at 58 …
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Factors affecting the quality and function of the bovine periovulatory follicle
… GnRH administration is standard practice in many estrous synchronization programs. For fixed-time artificial insemination programs, the detection of estrus prior to insemination has been shown to improve conception and decrease early embryonic loss. The impact of behavioral estrus expression on …
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Calcium and Phosphorus Metabolism in Jersey and Holstein Cows During Early Lactation
… balance at wk 11, possibly the result of timed estrous synchronization that occurred during wk 11. At wk 20, Ca balances were 61.2, 29.9, and 8.1 g/d for the HI, MED, and LOW diets, respectively. Phosphorus balances across all treatments and weeks were negative. Dietary Ca concentration did not …
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The use of carcass traits as indicators of heifer pregnancy in Angus cattle
… detection patch was applied to monitor visual estrous response. Upon AI breeding, both groups of heifers were transitioned to pasture and managed as one group. Bulls were released for natural service (NS) 10 days following AI breeding for a 45-day breeding season. Pregnancy status was evaluated …