John R. Jaeger
Kansas State University
52 Papers
303 Citations
John R. Jaeger is an academic researcher from Kansas State University. The author has contributed to research in topics: Biology & Weaning. The author has an hindex of 13, co-authored 43 publications.
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Papers
Detection of estrus by visual observation and radiotelemetry in peripubertal, estrus-synchronized beef heifers
TL;DR: Based on intervals between the first detected standing event of estrus and time of insemination, a wide window of fertility seems to exist in some heifers.
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Effects of implanting and feeding zilpaterol hydrochloride on performance, carcass characteristics, and subprimal beef yields of fed cows.
TL;DR: Feeding cull cows a concentrate diet increased carcass weight, dressing percentage, and subprimal yields compared with feeding cows a grass-based pasture diet, and the combination of a trenbolone acetate-estradiol implant and feeding zilpaterol hydrochloride can maximize trimmed beef yields from cull cows fed a high-concentrate diet.
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Reproductive response of yearling beef heifers to a melengestrol acetate-prostaglandin F2 alpha estrus synchronization system.
TL;DR: Conception rate at first service for MGA-PGF heifers that attained puberty during MGA feeding and before PGF2 alpha was not different (P = .50) from that of CON that attain puberty during the same period.
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Gonadotropin-releasing hormone increased pregnancy risk in suckled beef cows not detected in estrus and subjected to a split-time artificial insemination program.
S. L. Hill,David M. Grieger,K. C. Olson,John R. Jaeger,Carl R Dahlen,M. R. Crosswhite,N. Negrin Pereira,Sarah R Underdahl,B. W. Neville,Jason K. Ahola,M. C. Fischer,George E. Seidel,Jeffrey S. Stevenson +12 more
TL;DR: Cows had greater PR when they had been detected in estrus before AI, and PR was improved by administration of GnRH at 65 h after insert removal in cows that were not detected inEstrus and inseminated at 84 h.
Carcass and meat quality characteristics of Brahman cross bulls and steers finished on tropical pastures in Costa Rica.
Julio Rodríguez,John A. Unruh,Milton Villarreal,Olger Murillo,Sailim Rojas,Jorge Hernández Camacho,John R. Jaeger,Chris D. Reinhardt +7 more
TL;DR: Castration at younger ages is recommended because it provides improvement in LL and GM tenderness over bulls with no differences in carcass traits or subprimal yields.
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