@article{858f511a4cfe4b97b1a269e5caaa0ed7,
title = "Methods of identifying and inseminating nonpregnant beef females after synchronization of second estrus with norgestomet implants",
abstract = "Beef females (547) were included in three experiments to evaluate methods of identifying and inseminating nonpregnant beef females after synchronization of second estrus with norgestomet implants. In the first experiment, heifers not pregnant to the first insemination were identified for insemination via estrus (inseminated via the a.m./p.m. role or 48 h after implant removal). In the second experiment, females not pregnant to the first insemination were identified for insemination via estrus (inseminated via the a.m./p.m. role) or progesterone concentrations < 1.5 ng/mL at implant removal (inseminated 48 h after implant removal). In the third experiment, heifers not pregnant to the first insemination were identified for insemination via progesterone concentrations (as in experiment 2) or anterior vagina electrical resistance values < 81 ohm resistance 48 h after implant removal (inseminated after resistance measured). All methods of identifying and inseminating nonpregnant females were equally effective (P > 0.10) and did not effect (P > 0.10) calving rates from the first and second AI.",
keywords = "Calving rate, Electrical resistance, Estrus synchronization, Norgestomet, Progesterone",
author = "Domatob, {F. N.} and Favero, {R. J.} and Ireland, {F. A.} and Faulkner, {D. B.} and Kesler, {D. J.}",
note = "Funding Information: Beef females (547) were included in three experiments to evaluate methods of identifying and inseminating nonpregnant beef females after synchronization of second estrus with norgestomet implants. In the first experiment, heifers not pregnant to the first insemination were identified for insemination via estrus (inseminated via the a.m./p.m. rule or 48 h after implant removal). In the second experiment, females not pregnant to the first insemination were identified for insemination via estrus (inseminated via the a.m./p.m. rule) or progesterone concentrations < 1.5 ng/mL at implant removal (inseminated 48 h after implant removal). In the third experiment, heifers not pregnant to the first insemination were identified for insemination via progesterone concentrations (as in experiment 2) or anterior vagina electrical resistance values < 8 1 ohm resistance 48 h after implant removal (inseminated after resistance measured). All methods of identifying and inseminating nonpregnant females were equally effective (P > 0.10) and did not effect (P > 0.10) calving rates from the first and second AI. 0 1997 by Elsevier Science Inc. Key words: norgestomet, estrus synchronization, calving rate, progesterone, electrical resistance Acknowledgments {\textquoteleft}Funded in part by the African-American Institute (African Graduate Fellowship). 2Correspondence and reprint requests (1207 W. Gregory Dr.). This research was conducted as part of regional research project NC-l 13. Progesterone antisera was generously supplied by O.D. Sherwood, Department of Molecular and Integrative Physiology, University of Illinois, Urbana. Mention of trade names, proprietary products, or companies does not imply endorsement or warranty by the Department of Animal Sciences or the authors. Copyright: Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.",
year = "1997",
month = apr,
day = "1",
doi = "10.1016/S0093-691X(97)00064-2",
language = "English (US)",
volume = "47",
pages = "1077--1086",
journal = "Theriogenology",
issn = "0093-691X",
publisher = "Elsevier Inc.",
number = "5",
}