Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Multi-trait selection indexes for sustainable UK hill sheep production
Autore:
Conington, J; Bishop, SC; Grundy, B; Waterhouse, A; Simm, G;
Indirizzi:
Scottish Agr Coll, Edinburgh EH9 3JG, Midlothian, Scotland Scottish Agr Coll Edinburgh Midlothian Scotland EH9 3JG lothian, Scotland Roslin Inst, Roslin EH25 9PS, Midlothian, Scotland Roslin Inst Roslin Midlothian Scotland EH25 9PS 9PS, Midlothian, Scotland Scottish Agr Coll, Auchincruive KA6 5HW, Ayr, Scotland Scottish Agr Coll Auchincruive Ayr Scotland KA6 5HW A6 5HW, Ayr, Scotland
Titolo Testata:
ANIMAL SCIENCE
, volume: 73, anno: 2001,
parte:, 3
pagine: 413 - 423
SICI:
1357-7298(200112)73:<413:MSIFSU>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
LAMB SURVIVAL; GROWTH; CATTLE;
Keywords:
carcass composition; maternal effects; selection index; sheep;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Conington, J Scottish Agr Coll, W Mains Rd, Edinburgh EH9 3JG, Midlothian,Scotland Scottish Agr Coll W Mains Rd Edinburgh Midlothian Scotland EH9 3JG
Citazione:
J. Conington et al., "Multi-trait selection indexes for sustainable UK hill sheep production", ANIM SCI, 73, 2001, pp. 413-423

Abstract

Three selection indexes for the UK hill sheep sector are derived to suit the extremes of hill production systems. These are: (i) intensive, where allsurplus lambs not required for breeding are finished for slaughter, (ii) extensive, where all surplus 'store' lambs are sold to other farmers for finishing, and (iii) semi-intensive, which is intermediate between the two extremes, i.e. farms finish some lambs for slaughter and sell others as store lambs. Parameters for 12 breeding goal and index traits were estimated using a total of 3962 lamb records and 5944 ewe lambing records from Scottish Blackface sheep on two Scottish Agricultural College experimental hill farms. The breeding goal comprised carcass, maternal and survival traits. The evaluation of these indexes showed that improvements in maternal traits are possible, along with more modest improvements in carcass quality traits. Responses to selection are expected to be lower for the extensive farm in general, compared with the intensive farm. Evaluations of alternative indexes show that an index using measurements of fat and muscle on ewes rather than on lambs may be more cost-effective to implement in practice, compared withthe original index, although this change results in a higher (i.e. undesirable) gain in mature size. Sensitivity analyses showed that in general, theindexes are robust to changes in economic values and to changes in heritability estimates.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 02:47:49