W. Wittmann et al., INFLUENCE OF GENE-MARKERS ON BREEDING, FA TTENING AND CARCASS PERFORMANCE TRAITS OF A HOMOZYGOUS STRESS-RESISTANT GERMAN-LANDRACE SOW HERD, Archiv fur Tierzucht, 37(4), 1994, pp. 411-425
With the aim of the halothane reaction and the haplotyping of the link
age-group (S-Hal-Gpi-H-Po2-Pgd) of the bloodgroup-, enzyme- and serump
roteinsystems S, H, Gpi, Po2 and Pgd a homozygous-stressresistant Germ
an-Landrace sow-herd could be established. The 47 reproductive sows we
re selected in two groups (group 1 = 28 resting sows and group 2 = 19
culled sows) and attached to their 60 performance tested descendants t
o increase the breeding-, fattening- and carcass performance traits. T
he performance tested animals of the genotype Hal (NN) had significant
ly better results in pH-values and meat-brightness compared with the N
n-animals. A clear relationsship could be detected only for the traits
''food-conversion-rate'' and ''pH1-value in the loin'' with the genot
ypes of the S-system. Haplotypes could be used only with restrictions
for the selection of performance traits, but clearly for the eleminati
on of the Hal (n)-allel. The LPA-decendants of the group 1 had a signi
ficantly better daily weight gain and a shorter fattening period with
a lower food-conversion rate compared with the group 2. The breeding p
erformance traits ''piglets born living'', ''raised piglets'' and ''lo
st piglets until day 28'' were significantly better in the first group
. A comparison of the genotypes showed only for the H (-/-)-type signi
ficantly better results. The selection by haplotypes of the breeding p
erformance is not practicable, due to the poor relationsships with onl
y one significant difference in the trait ''piglet losses''. In a homo
zygous-stressresistant German-Landrace sow-herd it is possible to enha
nce the breeding-, fattening- and carcass performance traits up to the
level of a comparable heterozygous herd-book farm by performance sele
ction.