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Dry matter feed intakes for first lactation Holstein, Jersey and their reciprocal crosses in the Virginia Tech crossbreeding project. K. M. Olson*, B. G. Cassell, and M. D. Hanigan, Virginia Polytechnic Institute and State University, Blacksburg.

2:15 PM

224

Comparison of Holstein–Friesian, Norwegian Red and Holstein–Friesian×Norwegian Red cows on Irish dairy farms: Milk production and udder health. N. Begley*1,2, M. Rath2, and F. Buckley1, 1Teagasc, Moorepark, Fermoy, Co. Cork, Ireland, 2School of Life Sciences, UCD, Belfield, Dublin, Ireland.

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225

Heritability of electronically recorded daily body weight across lactation using random regression models. J. K. Toshniwal*1, C. D. Dechow1, J. A. D. R. N. Appuhamy2, and B. G. Cassell2, 1The Pennsylvania State University, State College, 2Virginia Polytechnic Institute and State University, Blacksburg.

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226

Evaluation of factors affecting changes in the ranking of sires over time. A. D. Coburn*1,2, K. A. Weigel1, S. A. Schnell2, and G. Abdel-Azim2, 1Univeristy of Wisconsin, Madison, 2Genex Cooperative, Inc., Shawano, WI.

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227

SNP identification in genes involved in the SREBP1 pathway in dairy cattle. J. F. Medrano* and G. Rincon, University of

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218

Genetic parameter estimates for two measures of disposition. F. E. Creason* and R. L. Weaber, University of Missouri, Columbia.

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Segregation of polymorphisms at Calpain and Calpastatin in beef cattle grown in the tropics. J. H. Bosques-Méndez*1, M. Pagan1, and E. Casas2, 1University of Puerto Rico, Mayagüez, Puerto Rico, 2Roman L. Hruska USDA MARC, Clay Center, Nebraska.

4:15 PM

220

Genetic analysis of rebreeding to produce a calf at three years of age in beef cows. J. M. Rumph*1, D. D. Kress1, K. C. Davis1, D. C. Anderson1,2, R. M. Enns3, C. M. McAllister1, and D. L. Boss2, 1Montana State University, Bozeman, 2Montana State University, Havre, 3Colorado State University, Fort Collins.

4:30 PM

221

Evaluation of the relationship between scrotal circumference and ultrasound intramuscular fat measurements in Angus cattle. A. M. Arnett*, J. M. Bormann, M. E. Dikeman, and D. W. Moser, Kansas State University, Manhattan.

4:45 PM

222

Phenotypic relationships among measures of feed utilization, ADG, and ultrasonic measures. K. A. Gray*, G. B. Huntington, M. H. Poore, C. S. Whisnant, and J. P. Cassady, North Carolina State University, Raleigh.

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229

Milk production, body condition score at breeding and reproductive efficiency of first lactation Holstein–Friesian, Jersey and Holstein–Friesian×Jersey cows under Irish grass–based production circumstances. R. Prendiville*1,2, F. Buckley1, N. Byrne1, and M. Rath2, 1Teagasc, Fermoy, Co. Cork., Ireland, 2University College Dublin, Belfield, Dublin, Ireland.

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Effect of service sire and cow sire on gestation length. H. D. Norman*, J. R. Wright, P. M. VanRaden, and J. B. Cole, Agricultural Research Service, USDA, Beltsville, MD.

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Inbreeding and relationship related to genetic estimates of calf survival in one Holstein sire family. R. D. Shanks*, University of Illinois, Urbana.

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Real-time PCR quantification of reproductive hormone receptor gene expression in superovulated MOET donor cows. S. Wise*1, M. A. Okomo-Adhiambo1, D. Joos1, W. Rauw1, A. Rink2, and L. Gomez-Raya1, 1University of Nevada, Reno, 2Animal Disease and Food Safety Laboratory, Reno, NV.

4:45 PM

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Poisson versus logit models for genetic analysis of mastitis in Norwegian cattle. A. I. Vázquez*1, K. A. Weigel1, D. Gianola1, D. M. Bates1, and B. Heringstad2, 1University of Wisconsin, Madison, 2Norwegian University of Life Science, Ås, Norway.

Souza2,3, L. O. Campos de Silva3, A. Gondo3, R. L. Weaber1, and W. R. Lamberson1, 1University of Missouri, Columbia, 2Parana Federal Univeristy, Palotina, PR, Brazil, 3Embrapa, Campo Grande, MS, Brazil.

Breeding and Genetics - Livestock and Poultry Dairy Cattle I Chair: Curt Van Tassell, USDA - ARS 214 C

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California, Davis.

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F i r s t s t e p s t o m o d e l m i l k u r e a i n a m a n a g e m e n t p e r s p e c t i v e . C . B a s t i n * 1 , A . G i l l o n 1 , a n d N . G e n g l e r 1 , 2 , 1 G e m b l o u x

Agricultural University, Gembloux, Belgium, 2National Fund for Scientific Research, Brussels, Belgium.

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