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Kansas Agricultural Experiment Station Research Reports
2004; Kansas Agricultural Experiment Station contribution; no. 05-112-S; Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 941; Dairy; Synchronized estrus; Ovulation; Cysts
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Resynchronizing Estrus And Ovulation In Open Cows And Heifers (2004), S.M. Tiffany, Jeffrey S. Stevenson
Resynchronizing Estrus And Ovulation In Open Cows And Heifers (2004), S.M. Tiffany, Jeffrey S. Stevenson
Kansas Agricultural Experiment Station Research Reports
We compared outcomes of two protocols used to resynchronize estrus and ovulation in dairy females after found open at pregnancy checks. Replacement heifers and lactating cows in which AI occurred 41 ± 1 day earlier were presented every 2 to 3 weeks for a pregnancy check by ultrasonography. Ovaries were scanned, follicles were mapped and sized, presence of corpus luteum was noted, and GnRH was injected (day 0) . Females received PGF2" 7 days later (day 7) and then were assigned randomly to either receive estradiol cypionate (ECP) 24 hours after PGF2" (day 8; Heatsynch; n = 230) or a …