The California Commercial Beef Cattle Ranch Project
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1 The California Commercial Beef Cattle Ranch Project Alison Van Eenennaam Animal Genomics and Biotechnology Cooperative Extension Specialist Department of Animal Science University of California, Davis, CA, USA Kristina L. Weber, PhD student Daniel Drake, Extension agent AAABG 21/10/2013
2 California Commercial Ranch Project Commercial Angus bulls 2100 cows/ year Progeny Three ranches: Cowley (900 cows) Kuck (500 cows) Mole-Richardson (700 cows) Data collection: AAA EPD & pedigree Sample collection: For genotyping MBV Meat Animal Research Center Ranch and harvest data Collection Genotyping Paternity Determination Assessment of DNA-enabled approaches for predicting the genetic merit of herd sires on commercial beef ranches AAABG 21/10/2013 Approximately 150 Angus bulls, and 6000 calves on project
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4 Cowley Ranch ~20 bulls/season
5 Kuck Ranch ~10 bulls/season
6 Mole-Richardson Farms ~30 bulls
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8 Cooperating ranchers were key to success of this project Need to test new technologies to see how they work under practical conditions Inadequate research on field application of new technologies Cooperating ranches make a substantial contribution of time, labor and expenses
9 We had occasional trouble capturing electronic weights
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11 Technology Tools Learnings EIDs, electronic scales, computers, handhelds, DNA sampling, genotyping Technology problems were constant but declined as we obtained experience Each additional piece of equipment exponentially increased problems Background knowledge and expertise in computing level for troubleshooting was very high Electronics were remarkably durable Record keeping was an important attribute to make this project work AAABG 21/10/2013
12 AAABG 21/10/2013
13 Despite our best efforts In five consecutive Ranch A calf cohorts, the carcass misidentification rate in the processing plant ranged from 3.5 to 19.3%, with an average misidentification rate of 10.8% Paternity assignment of sampled calves using a 99 SNP panel was very high (98%) For a variety of practical reasons DNA samples were not collected on 9.4% of the progeny with birth records. These considerations may influence whole herd results in commercial settings. AAABG 21/10/2013
14 Work flow and collaborators DNA on all bulls goes for whole genome scan collaboration with Jerry Taylor (MO) and John Pollak (MARC) Molecular breeding value (MBV) prediction of genetic merit based on MARC training data set collaboration with Dorian Garrick (IA), Taylor (MO), and U.S. Meat Animal Research Center (NE) Ranch data including sire groupings, birth dates and weaning weights on all calves, all EIDed, and DNAed for parentage determination collaboration with Dan Drake and producers Steer feedlot in weights, treatments, and carcass traits, weight, grading information and meat sample collected in the processing plant collaboration with Harris Ranch (CA) Compile data and compare three sources of genetic estimates: breed EPDs (bepds), commercial ranch EPDs (repds), and MBVs Kristina Weber, PhD student with occasional guidance from PI AAABG 21/10/2013
15 Ranch Year Season # Bulls/ season Mean bull age (± SD) Total # calves Number of calves per bull Min # calves Per bull Max # calves Mean # calves (± SD) A 2009 Spring ± ± 13.4 A Fall ± ± 10.0 A 2010 Spring ± ± 14.2 A Fall ± ± 12.6 A 2011 Spring ± ± 13.6 A Fall ± ± 9.2 B 2009 Spring ± ± 17.0 B Fall ± ± 11.4 B 2010 Spring ± ± 8.4 B Fall ± ± 11.4 B 2011 Spring ± ± 11.0 B Fall ± ± 15.2 C 2009 Fall ± ± 13.8 C 2010 Fall ± ± 13.0 C 2011 Fall ± ± 16.1 A All ± ± 1.2 B All ± ± 1.8 C All ± ± 1.4 A,B,C All ± ± 13.3 Additionally, 7.3% sires failed completely (i.e. no calves sired) in any given breeding season. AAABG 21/10/2013
16 Total income as feeder calves per sire or total retained ownership varied by sire (Total dollar per sire per calf crop, left axis), and the number of progeny per sire (right axis) and the mean individual feeder value/calf (right axis, $/10) AAABG 21/10/2013
17 Conceptions per week were greater (P<.02) during each week of the breeding season for the first 10 weeks of the breeding seasons for the two most prolific bulls (from each calf crop) compared to the least prolific bulls. AAABG 21/10/2013
18 EBVs, prolificacy and total income. Repeatability of prolificacy for full season bulls with data for more than one breeding season was 0.43 (±0.08). Scrotal circumference (SC) EBV was positively related to prolificacy (P<0.01). Approximately 5% of the total variation in sire prolificacy was explained by SC EBV. The calves that were sired by South Devon (n=217) and Hereford (n=145) bulls were on average 20.4 kg and 16.4 kg heavier than Angus-sired calves at weaning Irrespective of hybrid vigor (heterosis), prolificacy was the main driver of total calf weight weaned per sire. AAABG 21/10/2013
19 Summary and practical implications The number of calves born per sire per calf crop varied from 0 to 64. Prolificacy was by far the main driver of total weight weaned per sire. The total adjusted 205d weight per bull per calf crop was related (P<.01) to the number of calves (220±1.8 kg increase for each calf) explaining 98 percent of the variation in sire weight weaned per calf crop, and showed little correlation with mean adjusted progeny weaning weight per sire. Scrotal circumference (SC) was positively correlated with herd sire prolificacy (# of calves), and both total feeder calf & retained ownership value per sire. These data suggest inclusion of SC EPDs might be useful as selection criteria in commercial herd sire selection, & emphasize the importance of management approaches to increase the proportion of calves born in the first 21 or at most 42 days of the calving season Commercial ranch evaluations using natural service sires frequently have too few offspring due to variations in prolificacy to give an accurate evaluation The accuracy of MBVs was inflated in this commercial ranch population AAABG 21/10/2013
20 CHANGES IN BEHAVIOUR? Cowley Ranch Lessons learned: 1. Fertility is all important 2. More attention to detail: better records 3. Better way of selecting bulls for servicing cows ~20 bulls/season
21 FARMER UPTAKE? Thanks again for the project. I truly think it was very beneficial and of course in areas not expected. I recently read somewhere that you are working on a DNA project regarding BRD. Just curious, would you be able to take the DNA panels taken from out set of calves and use that in your study? Just thought I would ask
22 Happy California Cow Animal Biotechnology and Genomics Education
23 Questions? This project was supported by National Research Initiative Grant no to AVE from the USDA National Institute of Food and Agriculture. AAABG 21/10/2013
. K. L. Weber, Ph.D. graduate student Alison Van Eenennaam
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