Data/hora: 01/06/2024 01:21:32

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 09/04/1996
Data da última atualização: | 03/04/2017
Autoria: | BOLTON, R. C.; FRAHM, R. R.; CASTREE, J. W.; COLEMAN, S. W.
Título: | Genotype x environment interactions involving proportion of Brahman breeding and season of birth. I.calf growth to weaning.
Ano de publicação: | 1987
Fonte/Imprenta: | Journal Animal Science, v.65, n.1, p.42-47, 1987.
Idioma: | Inglês
Conteúdo: | Performance to weaning was evaluated on 489 spring-born and 416 fall-born crossbred calves of three proportion of Brahman breeding (0, 1/4 and 1/2 Brahman) over a 3-yr period. The calves were produced by appropriate matings of Angus (A), Hereford (H), Brahman (B), 1/2B-1/2A and 1/2B-1/2H bulls to Angus and Hereford cows. Interactions between proportion of Brahaman breeding and season of birth existed (P<.01) for all traits except birth weight. Birth weights of 1/4 and 1/2 Brahman calves were 1.4 and 3.8 kg heavier (P<.05), respectively, than O Brahman calves. Spring-born calves that were 1/4 and 1/2 Brahman outhained (P<.05) O Brahman calves 36 and 69 g/d, respectively and were 9 and 18 kg, respectively, heavier (P<.05) at weaning, whereas preweaning average daily gains and weaning weights were similar among fall-born crossbread calf groups. Among spring-born calves, 1/4 and 1/2 Brahman calves were 2.6 and 6.6 cm, respectively, taller (P<.05) than O Brahman calves, whereas amonf fall-born calves O and 1/4 Brahman calves had similar hip heights and 1/2 Brahman calves were 3.7 and 2.8 cm taller (P<.05) than O and 1/4 Brahman calves, respectively. Conformation and condition scores were similar for crossbred groups among spring-born calves, whereas conformation and condition scores decreased as proportion of Brahman breeding increased among fall-born calves. These data indicated that genotype x environment interactions are important in beef producxtion and increased proportions of Brahman breeding were advantagenous in a spring-calving program but not in a fall calving program.
Palavras-Chave: | Calvong season; Cross breeding; Genotype environment interactiopn.
Thesagro: | Gado de Corte; Produção.
Thesaurus Nal: | beef cattle; Brahman.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (31485-1) - ADD - SP - PP - SP14758 -  - 14758 - DIS