Selection indexes for Nellore production system in the Brazilian Pantanal
| Autor: | José Braccini Neto, M. D. MacNeil, Viviane Vasconcelos de Lacerda, Juliana Varchaki Portes, Gilberto Romeiro de Oliveira Menezes, Urbano Gomes Pinto de Abreu, Luiz Otávio Campos da Silva |
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| Přispěvatelé: | JULIANA VARCHAKI PORTES, Universidade Federal do Rio Grande do Sul, GILBERTO ROMEIRO DE OLIVEIRA MENEZE, CNPGC, LUIZ OTAVIO CAMPOS DA SILVA, CNPGC, MICHAEL D. MACNEIL, Delta G -Miles City, URBANO GOMES PINTO DE ABREU, CPAP, VIVIANE VASCONCELOS DE LACERDA, Universidade Federal do Rio Grande do Sul, JOSÉ BRACCINI NETO, Universidade Federal do Rio Grande do Sul. |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Gado de Corte
geography genetic gain geography.geographical_feature_category Offspring Genética Animal breeding objectives selection Beef cattle Biology Pasture SF1-1100 bioeconomic model Animal culture Bioeconomic models Animal science beef cattle Productivity (ecology) Genetic gain Herd Trait Animal Science and Zoology Animal genetics Selection (genetic algorithm) |
| Zdroj: | Revista Brasileira de Zootecnia, Vol 50 (2021) Revista Brasileira de Zootecnia, Volume: 50, Article number: e20200264, Published: 20 AUG 2021 Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA-Alice) Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA Revista Brasileira de Zootecnia v.50 2021 Revista Brasileira de Zootecnia Sociedade Brasileira de Zootecnia (SBZ) instacron:SBZ |
| ISSN: | 1806-9290 |
| Popis: | The objective was to develop selection indexes for Nellore cattle raised in full-cycle production system in the Brazilian Pantanal. The resulting offspring are retained as replacements or sold at two years of age. Preliminary analyses explored effects of scale on economic values (EV). However, given the available data, these effects were very small. Presented herein are results from a simulated system consisting of 5,000 cows with all animals maintained on pasture as is typical in Pantanal. The EV were determined by approximating the partial derivatives of the profit function, changing one trait at a time, by one unit, while keeping the other traits constant. Traits in the breeding objective were mature cow weight, direct and maternal weaning weight, postweaning average daily gain, subcutaneous fat depth, longissimus muscle area, and stayability. Economic values were calculated on the basis of number of animals (per head), number of animal units, and arroba of carcasss weight. Regardless of the basis, maternal weaning weight and subcutaneous fat depth made negligible contributions to the breeding objective. Proportions of variation in the breeding objectives (per head, per animal unit, per arroba) explained by cow weight, direct weaning weight, postweaning average daily gain, stayability, and longissimus muscle area were: 13, 13, 17; 6, 1, 5; 3, 3, 4; 67, 67, 61; and 11, 17, 13, respectively. These indexes may aid Nellore breeders in their selection decisions, thus facilitating the genetic progress and increased productivity and profitability of Pantanal herds. Made available in DSpace on 2021-08-13T15:00:26Z (GMT). No. of bitstreams: 1 Selection-indexes-for-Nellore-2021.pdf: 350493 bytes, checksum: 32c153ee6bdfa203ff18a5e6fc0bdc03 (MD5) Previous issue date: 2021 Animal production systems and agribusiness. |
| Databáze: | OpenAIRE |
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