|
Pure breeds
and crossed caprine genotypes effect in the oases of
southern Tunisia
Amor Gaddour* and Sghaier Najari
Arid Land Institute, 4119 Medenine, Tunisia.
*Corresponding author. E-mail:
amor.gaddour@ira.agrinet.tn /
gaddour.omar@yahoo.fr. Tel: +21675633005. Fax:
+21675633006.
Accepted 9 October, 2009 |
|
Data from 16 years performances schedule of local goat,
Alpine, Damascus, Murciana and crossed groups were used to
study the genotypes productive behaviour under Tunisian
oases conditions. The aim was to evaluate the possibilities
of local goat productivity improvement by cross-breeding in
intensive mode and also, to choose the better improving
breed and the propice crossing level. So, data of periodic
individual weighing were used to estimates kids weight at
some standard ages and dairy performances such as, daily
milk average, total production by lactation and milking
period of studied genetic goat groups. Statistical analyses
of about 1928 kids' weights and 1923 individual goat milking
showed that the cross-breeding allowed to improve the growth
performances since the first generation with respect to
local population production. ANOVA test showed an important
effect of genotypes and environment upon kids weights (P <
0.01). The mean kid's weight at birth and at 120 days age
were 3.49 and 15.78 kg respectively. The cross breeding
second generation allowed the improvement of local goat
potentialities kids weight at 120 days reaches 16.19 kg for
Damascus*local goat cross. The dairy production with this
generation was 164.5 kg for the Alpine one, 183.4 kg for
Damascus, 179.5 kg for Murciana and 133.5 kg by lactation
for the local breed. All imported breeds registered low
performances than those known in their original regions.
Key words:
Cross breeding, dairy production, Kids growth, local goat,
Oases, Tunisia. |
