NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS CONT (a) Allowance for doubtful debts Trade receivables are non-interest bearing and are generally on 14 day terms� An allowance for doubtful debts is recognised when there is  objective evidence that an individual trade receivable may not be collectible� Based on our assessment of the recoverability of trade receivables at  the reporting date, we concluded that an allowance for doubtful debts was not required at 31 March 2013, 31 December 2012 and 31 March 2012� 31 Mar 2013  $000 31 Dec 2012  $000 31 Mar 2012  $000  (reviewed) Cash at bank and in hand 7,414 12,380 8 Call deposits with banks 3,834 9,982 14,725 11,248 22,362 14,733 (i) Reconciliation of net (loss)/profit after tax to net cash flows  from operations Net loss after income tax (46,477) (8,409) (5,073) Adjustments for: Depreciation  2,728 9,405 2,203 Impairment of property, plant and equipment - 8,085 - Gain on sale of property, plant and equipment (18) (583) (67) (Increment)/decrement in net market value of livestock 59,426 (12,811) (3,560) Changes in assets and liabilities: (Increase)/decrease in inventories (5,084) (499) (29) (Increase)/decrease in trade and other receivables 720 2,659 10,881 (Increase)/decrease in prepayments and other assets 1,399 (1,221) (932) (Decrease)/increase in deferred tax liabilities (22,124) (3,940) (4,402) (Decrease)/increase in current tax liability (5,388) (91) (192) (Decrease)/increase in trade and other payables (4,250) 7,282 (15,357) (Decrease)/increase in interest rate swaps  230 (1,658) (253) (Decrease)/increase in provisions  235 1,010  142 Net cash used in operating activities (18,603) (771) (16,639) (ii) Non-cash financing and investing activities Acquisition of assets by means of finance leases  - 6,787 - Share-based payments (note 27) 130 601 60 13. CURRENT ASSETS – TRADE AND OTHER RECEIVABLES Trade receivables 11,448 16,073 8,043 Other receivables 5,381 1,299 1,787 16,829 17,372 9,830 12. CURRENT ASSETS — CASH AND CASH EQUIVALENTS Annual Report 2013 81