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Factors affecting pre-ovulatory follicular diameter and ovulation rate following GnRH administration in anestrous beef cows. J. A. Atkins*1, T. W. Geary2, K. J. Wells3, M. C. Lucy1, and M. F. Smith1, 1University of Missouri, Columbia, USDA ARS Fort Keogh, Miles City, MT, 3Michigan State University, East Lansing.

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Comparison of protocols to synchronize estrus and ovulation I: Estrous cycling beef heifers. N. R. Leitman*, D. C. Busch, J. F. Bader, D. J. Wilson, M. R. Ellersieck, M. F. Smith, and D. J. Patterson, University of Missouri, Columbia.

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118

Comparison of protocols to synchronize estrus and ovulation II: Prepubertal beef heifers. N. R. Leitman*, D. C. Busch, J. F. Bader, D. J. Wilson, M. R. Ellersieck, M. F. Smith, and D. J. Patterson, University of Missouri, Columbia.

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119

Pregnancy rates following fixed-time AI in beef heifers after administration of CIDR-based protocols to synchronize estrus and ovulation. D. C. Busch*1, D. J. Wilson1, D. J. Schafer2, N. R. Leitman1, J. K. Hadek2, M. R. Ellersieck1, M. F. Smith1, and D. J. Patterson1, 1University of Missouri, Columbia, 2MFA Inc., Columbia, MO.

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120

Timing of fixed-time AI in beef cows following the CO-Synch + CIDR protocol. D. C. Busch*1, D. J. Schafer , N. R. Leitman1, D. J. Wilson1, J. K. Haden2, M. F. Smith1, and D. J. Patterson1, 1University of Missouri, Columbia, MFA Inc., Columbia, MO.

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Comparison of the 7-11 estrous synchronization protocol between suckled Angus (AN) and Brangus (BN) cows. R. D. Esterman*, B. R. Austin, S. A. Woodall, and J. V. Yelich, University of Florida, Gainesville.

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122

The use of estrus synchronization, resynchronization, and ultrasound to facilitate two timed artificial inseminations without heat detection in beef cattle. W. E. Beal*, M. D. Utt, and T. E. Wiseman, Virginia Polytechnic Institute and State University, Blacksburg.

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123

Effect of GnRH at time of insemination on initiation of LH pulses and subsequent progesterone. S. D. Fields*, B. L. Perry, and G. A. Perry, South Dakota State University, Brookings.

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124

Effect of pretreatment with prostaglandin F2α 12 days before initiation of Resynch on fertility of lactating dairy cows. E. Silva*1, R. A. Sterry1, D. Kolb2, M. C. Wiltbank1, and P.M. Fricke1, 1University of Wisconsin, Madison, 2Lodi Veterinary Clinic, Lodi, WI.

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125

Reducing the interval from Presynchronization to initiation of timed AI improves fertility in dairy cows. K. N. Galvao*, M. F. Sa Filho, and J. E.P. Santos, School of Veterinary Medicine, University of California Davis, Tulare.

Physiology & Endocrinology - Livestock and Poultry Estrous Synchronization Chair: Raymond Nebel, Select Sires 214 D

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110

The effect of varied levels of E. Coli. phytase on phosphorus balance in weanling pigs. T. C. Tsai*1, C. R. Dove1, M. J. Azain1, and M. Bedford1, 1University of Georgia, Athens, 2Syngenta Animal Nutrient, RTP, NC.

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111

Effects of different available-phosphorus levels in diets on nitrogen and phosphorus digestibilities in growing pigs. X. Wu1, Y. L. Yin1, G. Y. Wu1,3, T. J. Li1, Y. G. Zhang1, F. Y. Yan1, R. L. Huang1, and M. Z. Fan*4, 1Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha, Hunan, China, 2Huazhong Agricultural University, Wuhan, Hubei, China, 3Texas A&M University, College Station, 4University of Guelph, Guelph, Ontario, Canada.

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Influence of dietary reductions in CP, P, and trace minerals on DM, N, P, and mineral excretion in finishing pigs. M. Lachmann*, S. Carter, J. Bundy, S. Jenkin, and Z. Marable, Oklahoma State University, Stillwater.

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Factors affecting phytase activity: implication for assay development. M. F. Isaksen*1,2

a n d S . D a l s g a a r d 1 , 2 , 1 D a n i s c o

Innovations, Brabrand, Denmark, 2Danisco Animal Nutrition, Marlborough, Wiltshire, UK.

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Effect of mineral status and calcium (Ca) concentration on phosphorus (P) and Ca utilization in piglets. M. P. Letourneau Montminy*1, C. Jondreville2, D. Sauvant3, M. Magnin4, C. Pomar5, and P. Lescoat1, 1INRA UR83, Nouzilly, France, 2INRA USC340, Vandoeuvre-les-Nancy, France, 3INRA UMR791, Paris, France, 4BASF Nutrition Animale, Château-Gontier, France, 5Agriculture et Agroalimentaire Canada, Lennoxville, Canada.

Exogenous glutathione reduces cadmium toxicity to giant freshwater prawns Macrobrachium rosenbergii. W. Y. Chu*1, Y. L. Yin1, K. Yao1, T. J. Li1, R. L. Huang1, and G. Y. Wu1,2, 1Institute of Subtropical Agriculture, The Chinese Academy of

Sciences, Changsha, Hunan, China, 2Texas A&M University, College Station.

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