Sire × contemporary group interactions for birth weight and preweaning growth traits in the Asturiana de los Valles beef cattle breed |
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| Institution: | 1. Research Ecologist, USDA-ARS Rangeland Resources Research Unit, Fort Collins, CO 80523, USA;2. Research Scientist, Forest and Rangeland Stewardship Department and Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO 80523, USA;3. Research Leader and Rangeland Scientist, USDA-ARS Rangeland Resources Research Unit, Cheyenne, WY 82009, USA;1. Range Conservationist, Natural Resource Conservation Service, Elko, NV 89801, USA;2. Associate Professor, Department of Wildland Resources, Utah State University, Logan, UT 84322-5230, USA;3. Emeritus Professor, Department of Wildland Resources, Utah State University, Logan, UT 84322-5230, USA.;1. Professional Research Associate, Department of Animal and Poultry Science, University of Saskatchewan, Saskatoon, SK S7N 5A8, Canada;2. Program Head and Director, Eastern Oregon Ag & Natural Resource Program, Oregon State University, Union, OR 97883, USA;3. Wildlife Research Biologist, Oregon Department of Fish and Wildlife, La Grande, OR 97850, USA;4. Supervisory Rangeland Scientist, Pacific Northwest (PNW) Research Station, USDA Forest Service Forestry and Range Sciences Laboratory, La Grande, OR 97850, USA;2. Professor, Animal and Range Sciences Department, New Mexico State University, Las Curses, NM 88003, USA;3. Regional Specialist in Range Management, Colorado State University Extension, Grand Junction, CO 81506, USA;4. Professor, School of Natural Resources and the Environment, University of Arizona, Tucson, AZ 85721, USA |
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| Abstract: | Although a number of recent studies have focused on the existence of a non-negligible sire × contemporary group interaction effect (s) affecting the estimation of genetic parameters for maternally influenced traits in beef cattle, the assessment and interpretation of this effect using field data remains poorly understood. In this study 27,639 records of both birth weight (BW) and weaning weight (WW) from the Asturiana de los Valles breed were used to assess the consequences of the inclusion of an s effect on the estimation of genetic parameters for BW, WW and average daily gain (ADG) fitting univariate and bivariate models. Estimations of s2 for BW, WW and ADG were 0.040, 0.070 and 0.077 regardless of the fitted model. Inclusion of s in the estimation models induced a reduction of both the direct and the maternal heritability, varying between 8 and 28% with the trait and the estimation model employed. As expected, the correlations between both direct and maternal genetic effects for each trait were less negative when s was included in the estimation model. The estimated correlations between the s effect affecting BW, WW and ADG were 0.108, ? 0.038 and 0.616 for the pairs BW–WW, BW–ADG and WW–ADG, respectively. These results suggest that misidentification of individuals cannot be the sole cause of the effect of s and that this effect is of a different nature and origin for different traits (i.e. selective matings for low BW's and unaccounted management practices for preweaning growth traits). Models including the s effect should be accepted as working models in beef improvement schemes. |
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