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The current research was conducted to highlight on some biological critical control points (CCPs) responsible for production in Barki sheep flocks. Quantify biological values (BVs) and economic values (EVs) of the critical biological trait were also estimated. The sensitivity analysis was carried out to predict its potential economic response to proposed scenarios varying in biological parameters level and market prices. Data utilized in this study were 7300 accumulated records of Barki ewes collected over 37 successive breeding seasons of Barki sheep flock. Partial Least Squares regression (PLS) procedures as described by XLSTAT (2009) were applied. The obtained results indicated that lamb's growth rate (GR) was the most biological critical control point of Barki flock productivity. GR had a marked positive impact on kilograms of lambs weaned per ewe joined (KW/EJ) with biological value of +548 gm. Lambs mortality rate (LMR) had negative effect on KW/EJ and declined KW/EJ by -143 gm. Growth rate had the highest positive EV per ewe and exceeded gross margin per ewe (GM/EJ) by LE +25 compared to base flock. LMR had negative EV of LE -6. GR considered a critical success factor in the revenues, while LMR had a severe negative impact on Barki sheep enterprise profitability. It could be concluded that GR and LMR are the biological CCPs for Barki flock productivity and profitability. Sensitivity analysis confirmed that, EVs of the studied CCPs were more sensitive to changes in concentrate feed mix costs and lambs mortality rate than the other proposed scenarios.

IDENTIFY SOME BIOLOGICAL CRITICAL CONTROL POINTS OF BARKI SHEEP PRODUCTION RAISED IN NORTH WESTERN DESERT OF EGYPT