Íslenskar landbúnaðarrannsóknir - 01.09.1982, Side 90

88 ÍSLENZKAR LANDBÚNAÐARRANNSÓKNIR
SUMMARY
Excess hoof growth in 4 — 5 month old lambs
Stefán Aðalsteinsson,
Agr.Res. Institute Keldnaholt, Reykjavík.
In the autumn of 1982, three female lambs
with excess hoof growth were observed in a
piebald sheep strain in the flock at The
Agricultural School Holar in North Ice-
land. The hooves were up to 7 cm in length,
and the affected lambs had difficulty in
walking.
HEIMILDIR-REFERENCES
Páll A. Pálsson, 1955: Nokkrir húðkvillar í sauðfé.
Búnaðarrit, 68. : 20-45.
All the affected almbs were born from
half-sib matings where the common grand-
sire was Bekkur 244. cfr. Table 1. The
condition is therefore suspected to be
hereditary and most likely due to a single
autosomal recessive gene. The number of
lambs born from matings of suspected
carriers to daughters of suspected carriers
is shown in Table 2. The observed ratio of
affected progeny (3/51) does not differ
significantly from expectation (6.375/51).