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The current research was conducted to determine the optimal annual culling rates that maximize profits generated from different Barki sheep flocks varying mainly in biological performance and different annual culling rates raised under semi-arid conditions. Data utilized were obtained from the accumulated 7233 records of Barki sheep flock collected over 37 successive breeding seasons representing 2039 breeding ewes raised at Maryout Research Station. Two variables were combined factorially to create twelve simulated flocks, the first variable was biological performance of three categories, top (T), medium (M) and bottom (B), while the second variable was proposed culling rates with four levels (10%, 15%, 20% and 30%). Financial comparison among the studied twelve simulated flocks revealed the considerable interrelation between the biological performance of the flock and annual culling rate and its impact on flock profitability. The results showed that simulated flock (T/15) achieved the highest gross margin/ewe of LE 173 among all the studied flocks, except those simulated flocks of (B/10) and (B/30) which scored negative values of LE -12 and LE -43, respectively. The current Benefit/Cost ratios revealed that, simulated flock (T/15) achieved the highest ratio of 1.25, in contrary, the four bottom simulated ( B/10, B/15, B/20, B/30), scored 0.98, 1.01, 1.02 and 0.95, respectively. The current research concluded that the recommended profitable annual culling rate for Barki sheep enterprise were 15% for (T) flock, while 20% for (M) and (B) flocks raised under semi-arid conditions in Egypt.

PROFITABLE CULLING RATES OF BARKI SHEEP FLOCK RAISED UNDER SEMI-ARID CONDITIONS IN EGYPT