Data/hora: 23/06/2024 13:44:56

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 27/07/1995
Data da última atualização: | 27/07/1995
Autoria: | JOANDET, G. E.; CARTWRIGHT, T. C.
Título: | Estimation of efficiency of beef production.
Ano de publicação: | 1969
Fonte/Imprenta: | Journal of Animal Science, v.29, n.6, p.862-868, 1969.
Idioma: | Inglês
Conteúdo: | Monthly weights of 118 cows from birth until they were culled from the herd were used in the study. Twelve different breeding groups were represented. Discription of the growth curve was made for each individual with the Gompertz equation. The effects year of birth and breeding group on parameters of the equation were studies. Both variables had significant effect on A but only breeding group affected the ratio. Since this ratio is associated asymptotic or mature weight, these environmental effects did not significantly affect nature weight in this study.Age ate which animals rechead puberty or point of infection was significantly affected by year of birth. Different breeding groups showed differences in growth pattern, fertility, milk production and longevity. Taking these variables into consideration, cumulative TDN required for production was computed by imposing a set of assumptions and estimating TDN requirements. It was shown that there is a point in the life of a slaughter animal at which the cumulative TDN required to produce a unit of live weight is minimum. The weight and age at which this maximum efficiency point was reached (optimum slaughter weight) was different for the different breeding groups. Based on cumulative TDN requirements, optimum slaughter weight ranged from 334 to 400 kg. at ages from 17 to 22 months. Different breeding groups, compared at optimum slaughter weight, produced a kg. of live weight at efficiencies which varied as much as 1 kg. or more of cumulative TDN.
Palavras-Chave: | Bovine; Gompertz equation; Growth curve; Production; TDN.
Thesagro: | Bovino; Curva de Crescimento; Produção.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (28741-1) - ADD - SP - -- - SP0431 -  - 0431 - DIS