title: New breeding objectives and selection indices for the Australian dairy industry.
abstract: This study comprises an update of the economic values for dairy traits for the Australian industry and the formulation of updated selection indices. An economic model, which calculates partial economic values for each trait individually, was developed to determine the economic implications of selective dairy breeding, based on the effect of trait changes on the profit of commercial dairy farms in Australia. Selection indices were developed from economic values, which were transformed into base economic weights by including the discounted genetic expressions coefficients. Economic weights (in Australian dollars) were 1.79, 6.92, -0.10, -5.44, 8.84, 7.68, 1.07, 4.86, 1.91, 3.51, 4.90, 0.31, 2.03, 2.00, and 0.59, for milk fat (kg), milk protein (kg), milk volume (L), body weight (kg), survival (%), residual survival (%), somatic cell count (cells/mL), fertility (%), mammary system [Australian Breeding Value (ABV) unit], temperament (ABV unit), milking speed (ABV unit), udder depth (%), overall type (%), fore udder attachment (%), and pin set (%), respectively. The updated economic weights presented in this study constituted the basis of the definition for 3 new indices. These indices were developed from combination of bioeconomic principles, patterns of farmer preferences for trait improvements, and desired gains approaches. The 3 indices, Balanced Performance Index, Health Weighted Index, and Type Weighted Index, have been released to the industry.
authors: AbacusBio Limited, Dunedin 9016, New Zealand. Electronic address: tbyrne@abacusbio.co.nz.
authors: T J
authors: TJ
authors: Byrne
authors: AbacusBio Limited, Dunedin 9016, New Zealand; School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia.
authors: B F S
authors: BFS
authors: Santos
authors: AbacusBio Limited, Dunedin 9016, New Zealand.
authors: P R
authors: PR
authors: Amer
authors: AbacusBio Limited, Dunedin 9016, New Zealand.
authors: D
authors: D
authors: Martin-Collado
authors: Department of Economic Development, Jobs, Transport and Resources and La Trobe University, AgriBio, Bundoora, VIC 3083, Australia.
authors: J E
authors: JE
authors: Pryce
authors: Australian Dairy Herd Improvement Scheme, Melbourne, VIC 3000, Australia.
authors: M
authors: M
authors: Axford
mesh_terms: D000818:Animals; D001315:Australia; D001947:Breeding; D003612:Dairying / Q000191:economics*; D008892:Milk / Q000378:metabolism; D010641:Phenotype; D012641:Selection, Genetic
keywords: dairy cattle; economic value; farmer preferences; selection index