Genetic analysis of milking ability in Lacaune dairy ewes.
The milking ability of Lacaune ewes was characterised by derived traits of milk flow patterns, in an INRA experimental farm, from a divergent selection experiment in order to estimate the correlated effects of selection for protein and fat yields. The analysis of selected divergent line effects (involving 34 616 data and 1204 ewes) indicated an indirect improvement of milking traits (+17% for maximum milk flow and -10% for latency time) with a 25% increase in milk yield. Genetic parameters were estimated by multi-trait analysis with an animal model, on 751 primiparous ewes. The heritabilities of the traits expressed on an annual basis were high, especially for maximum flow (0.54) and for latency time (0.55). The heritabilities were intermediate for average flow (0.30), time at maximum flow (0.42) and phase of increasing flow (0.43), and low for the phase of decreasing flow (0.16) and the plateau of high flow (0.07). When considering test-day data, the heritabilities of maximum flow and latency time remained intermediate and stable throughout the lactation. Genetic correlations between milk yield and milking traits were all favourable, but latency time was less milk yield dependent (-0.22) than maximum flow (+0.46). It is concluded that the current dairy ewe selection based on milk solid yield is not antagonistic to milking ability.
Station d'amélioration génétique des animaux, Institut national de la recherche agronomique, BP 52 627, 31326 Castanet-Tolosan Cedex, France. marie@toulouse.inra.fr
Christel
C
Marie-Etancelin
Eduardo
E
Manfredi
Marie-Rose
MR
Aurel
François
F
Pailler
Jean
J
Arhainx
Edmond
E
Ricard
Gilles
G
Lagriffoul
Philippe
P
Guillouet
Bernard
B
Bibé
Francis
F
Barillet
D000818:Animals; D003612:Dairying; D005260:Female; D007774:Lactation / Q000235:genetics*; D019655:Quantitative Trait, Heritable; D012641:Selection, Genetic; D012756:Sheep / Q000502:physiology*