AUTUMN AND WINTER LAMBING STRATEGIES IN NORTHLAND
1986; New Zealand Grassland Association; Linguagem: Inglês
10.33584/jnzg.1986.47.1744
ISSN1179-4577
AutoresW. G. K. Andrewes, A. O. Taylor,
Tópico(s)Genetic and phenotypic traits in livestock
ResumoProgress in the development of autumn and winter lambing systems in Northland is described. Both involve split flock lambing in which 30 or 15% of ewes lamb in autumn or winter respectivelv, the remainder in spring. Using progesterone priming, a high ram to ewe ratio (10%) and ram management, 80.90% of ewes joined lamb over 2 cycles. Winter lambing using cull ewes is simple and does not require a breeding programme. Ewes and their lambs can be sent to the meat works from September. For low cost lamb production with present breeds, autumn lambing requires a breeding programme to develop spring mating ability. Heavyweight(18kg)carcasses can be produced early in the killing season. Autumn born replacement ewe lambs consistently averaged 40kg before their first summer. Both systems offer more flexibility in sheep production on farms and in processing and marketing. Keywords: Autumn lambing, winter lambing, split lambing, management options, extending killing season, heavyweight lambs production
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