دورية أكاديمية
Longitudinal genetic dynamics of weaning index and implications for cow-calf production efficiency.
| العنوان: | Longitudinal genetic dynamics of weaning index and implications for cow-calf production efficiency. |
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| المؤلفون: | Almeida KC; Grupo de Melhoramento Animal de Mato Grosso (GMAT), Instituto de Ciências Agrárias e Tecnológicas, Universidade Federal de Rondonópolis (UFR), 78736-900 Rondonópolis, MT, Brazil., Bignardi AB; Grupo de Melhoramento Animal de Mato Grosso (GMAT), Instituto de Ciências Agrárias e Tecnológicas, Universidade Federal de Rondonópolis (UFR), 78736-900 Rondonópolis, MT, Brazil., Mercadante MEZ; Instituto de Zootecnia (IZ), Centro Avançado de Pesquisa de Bovinos de Corte, CP 63, 14160-900 Sertãozinho, SP, Brazil., El Faro L; Instituto de Zootecnia (IZ), Centro Avançado de Pesquisa de Bovinos de Corte, CP 63, 14160-900 Sertãozinho, SP, Brazil., Cyrillo JNSG; Instituto de Zootecnia (IZ), Centro Avançado de Pesquisa de Bovinos de Corte, CP 63, 14160-900 Sertãozinho, SP, Brazil., Boligon AA; Departamento de Zootecnia, Universidade Federal de Pelotas (UFPEL), Campus Universitário Capão do Leão, s/n, 96160-000 Capão do Leão, RS, Brazil., Carvalheiro R; Commonwealth Scientific and Industrial Research Organisation (CSIRO), Agriculture and Food, Castray Esplanade, Hobart TAS 7001, Australia., Pereira RJ; Grupo de Melhoramento Animal de Mato Grosso (GMAT), Instituto de Ciências Agrárias e Tecnológicas, Universidade Federal de Rondonópolis (UFR), 78736-900 Rondonópolis, MT, Brazil., Santana ML; Grupo de Melhoramento Animal de Mato Grosso (GMAT), Instituto de Ciências Agrárias e Tecnológicas, Universidade Federal de Rondonópolis (UFR), 78736-900 Rondonópolis, MT, Brazil. Electronic address: santana@ufr.edu.br. |
| المصدر: | Animal : an international journal of animal bioscience [Animal] 2024 Feb; Vol. 18 (2), pp. 101064. Date of Electronic Publication: 2023 Dec 21. |
| نوع المنشور: | Journal Article |
| اللغة: | English |
| بيانات الدورية: | Publisher: Elsevier Country of Publication: England NLM ID: 101303270 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1751-732X (Electronic) Linking ISSN: 17517311 NLM ISO Abbreviation: Animal Subsets: MEDLINE |
| أسماء مطبوعة: | Publication: 2021- : [London] : Elsevier Original Publication: Cambridge, England : Cambridge University Press |
| مواضيع طبية MeSH: | Weaning*, Female ; Cattle/genetics ; Animals ; Body Weight/genetics ; Phenotype |
| مستخلص: | In beef cattle, the selection for higher weights at young ages has been questioned with the argument that this criterion may increase the adult weight of cows, resulting in higher costs. Therefore, selection criteria should be employed to increase weights at young ages with minimal impact on the adult weight of cows. Additionally, the relationship between measures of cow production efficiency and other well-established selection criteria in breeding programs remains poorly understood. The objective of this study was to longitudinally evaluate the relationship between the weaning index (WIndex) as a measure of efficiency and growth traits of the cows. Possible changes over time in WIndex due to selection applied for yearling weight (YW) were also investigated. The WIndex was proposed to maximize genetic response in the weaning weight of the calf while maintaining genetic gain in BW of the cow at zero. A random regression model was adopted to estimate correlations between WIndex, BW, hip height (HH), and body condition score (BCS) using records of Nelore cows from three lines. Genetic trends were calculated for the control line (NeC) and lines selected for greater YW (NeS and NeT). The age of 3 years was the most critical for the weaning efficiency of the cows. At this stage, young cows are still growing and wean lighter calves than their adult counterparts. The genetic correlation estimates between WIndex and BW (-0.58 to 0.04), HH (-0.05 to -0.34), and BCS (-0.51 to -0.17) were close to zero or negative. BW and HH were strongly correlated genetically across all ages (0.73-0.76). In general, HH exhibited a weak and negative genetic relationship with BCS. The genetic correlation between BW and BCS was stronger for advanced ages (0.45-0.68). In lines selected for YW, important increases in WIndex were observed. However, NeS has been selected since the 1980s until the present for YW, and thus, it showed a more pronounced trend of increasing BW and, consequently, a more modest trend of increasing WIndex compared to NeT. In contrast, WIndex exhibited a trend close to zero for NeC. In this context, monitoring HH and BCS can be useful to avoid losses in the weaning efficiency of cows. Furthermore, we suggest that one way to mitigate efficiency losses in calf production could involve stabilizing the BW of cows and increasing the weaning weight of calves using the WIndex. (Copyright © 2023 The Authors. Published by Elsevier B.V. All rights reserved.) |
| فهرسة مساهمة: | Keywords: Beef cattle; Cow efficiency; Genetic correlation; Mature weight; Random regression model |
| تواريخ الأحداث: | Date Created: 20240117 Date Completed: 20240226 Latest Revision: 20240226 |
| رمز التحديث: | 20240226 |
| DOI: | 10.1016/j.animal.2023.101064 |
| PMID: | 38232659 |
| قاعدة البيانات: | MEDLINE |
Full Text Finder | تدمد: | 1751-732X |
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| DOI: | 10.1016/j.animal.2023.101064 |