{"doi":"10.2527/2002.8092247x","title":"Effect of age at feedlot entry on performance and carcass characteristics of bulls and steers","abstract":null,"journal":"Journal of Animal Science","year":2002,"id":657372,"datarank":4.553391452966602,"base_score":4.31748811353631,"endowment":4.31748811353631,"self_citation_contribution":0.6476232170304466,"citation_network_contribution":3.905768235936156,"self_endowment_contribution":0.6476232170304466,"citer_contribution":3.905768235936156,"corpus_percentile":null,"corpus_rank":null,"citation_count":74,"citer_count":69,"citers_with_citation_signal":58,"citers_with_endowment":58,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":null,"is_data_producer":false,"deposit_databanks":null,"is_oa":false,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":null,"fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":1716077,"name":"S. C. Loerch","orcid":null,"position":1,"is_corresponding":false},{"id":1716078,"name":"F. L. Fluharty","orcid":null,"position":2,"is_corresponding":false},{"id":1716079,"name":"H. N. Zerby","orcid":null,"position":3,"is_corresponding":false},{"id":1716080,"name":"T. B. Turner","orcid":null,"position":4,"is_corresponding":false},{"id":1491246,"name":"J. P. Schoonmaker","orcid":"0000-0001-6641-0166","position":0,"is_corresponding":false}],"reference_count":0,"raw_metadata":{"has_enrichment":true,"resolved":true,"title":"Effect of age at feedlot entry on performance and carcass characteristics of bulls and steers","abstract":"Seventy Angus x Simmental calves (BW = 166.3 +/- 4.2 kg) were used in a 3 x 2 factorial arrangement to determine the effect of age at feedlot entry and castration on growth, performance, and carcass characteristics. At 82 d of age, steers were castrated. Calves were placed in the feedlot at 111 (early-weaned), 202, or 371 (yearling) d of age. Steers were implanted with Synovex-S followed 93 d later with Revalor-S. Calves were harvested on an individual basis when fat thickness was estimated to be 1.27 cm. During the feedlot phase, yearlings gained faster (P < 0.01) than calves placed in the feedlot at 202 or 111 d of age (1.88, 1.68, and 1.62 kg/d, respectively); however, from 111 d of age until harvest, ADG was greatest for early-weaned calves, intermediate for cattle placed in the feedlot at 202 d of age, and lowest for yearlings (1.62, 1.47, and 1.21 kg/d, respectively; P < 0.01). Early-weaned calves spent the most days in the feedlot, followed by calves placed in the feedlot at 202 d of age; yearlings spent the fewest days in the feedlot (221, 190, and 163 d, respectively; P < 0.01). Total DMI when in the feedlot was similar (P = 0.22) among age groups; however, daily DMI was lowest for early-weaned calves, intermediate for calves placed in the feedlot at 202 d of age, and the highest for yearlings (7.1, 8.1, 10.5 kg/ d, respectively; P < 0.01). Early-weaned calves were the most efficient, followed by calves placed in the feedlot at 202 d of age; yearlings were the least efficient (227, 207, 180 g gain/kg feed, respectively; P < 0.01). Weight at harvest (682, 582, 517 kg, respectively; P < 0.01) and hot carcass weight (413, 358, 314 kg, respectively; P < 0.01) were greatest for yearlings, intermediate for cattle placed in the feedlot at 202 d of age, and lowest for early-weaned calves. Early-weaned calves had the smallest longissimus area, followed by calves placed in the feed-lot at 202 d of age; yearlings had the largest longissimus area (77, 86, 88 cm2, respectively; P < 0.01). Calves placed in the feedlot at 111 and 202 d of age had lower yield grades (3.2, 3.1, 3.5, respectively; P < 0.04), and produced fewer select carcasses than yearlings (25, 13, 48%, respectively; P < 0.01). Bulls and implanted steers both had an ADG of 1.7 kg/d when in the feedlot; however, bulls had a greater (P < 0.09) hot carcass weight (370 vs 354 kg) and a larger (P < 0.01) longissimus area (85.8 vs 81.3 cm2) than steers. Earlier feedlot placement resulted in greater quality grades but lower carcass weights.","is_dataset_classified":null,"base_score":4.31748811353631,"endowment":4.31748811353631,"datacite_reuse_total":0,"file_count":0,"downloads":0,"views":0,"has_version_chain":false,"is_dataset":false,"is_oa":false,"pmid":"12350001","pmcid":null,"openalex_id":"https://openalex.org/W1497083628","authors":[],"funders":[],"total_grants":0,"fwci":1.4019,"citation_percentile":0.81289847,"influential_citations":0,"citation_trend":[{"year":2012,"count":8},{"year":2013,"count":8},{"year":2014,"count":3},{"year":2015,"count":4},{"year":2016,"count":1},{"year":2017,"count":5},{"year":2019,"count":2},{"year":2020,"count":2},{"year":2021,"count":5},{"year":2022,"count":1},{"year":2023,"count":5},{"year":2024,"count":1},{"year":2025,"count":2}],"oa_status":"closed","license":null,"oa_locations":[{"url":"https://www.animalsciencepublications.org/publications/jas/pdfs/80/9/2247","host_type":"publisher"},{"url":"https://doi.org/10.2527/2002.8092247x","host_type":"journal"},{"url":"https://pubmed.ncbi.nlm.nih.gov/12350001","host_type":"repository"}],"fields_of_study":["Genetic and phenotypic traits in livestock","Animal Nutrition and Physiology","Ruminant Nutrition and Digestive Physiology","Adipose Tissue","Age Factors","Animal Husbandry","Animals","Body Composition","Body Weight","Breeding","Cattle","Male","Meat","Muscle, Skeletal","Orchiectomy","Weaning"],"mesh_terms":["Adipose Tissue","Age Factors","Animals","Animal Husbandry","Body Composition","Body Weight","Breeding","Cattle","Male","Meat","Orchiectomy","Weaning","Muscle, Skeletal"],"keywords":["Feedlot","Animal science","Beef cattle","Biology","Weaning","Age groups"],"sdg_mappings":[{"sdg_number":0,"sdg_label":"Life in Land"}],"linked_datasets":[],"clinical_trials":[],"software_tools":[],"database_accessions":[],"source":"live","citation_network_status":"fetched"},"created_at":"2026-08-12T00:50:42.909406Z","pmid":null,"pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}