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<link:definition>014 - Disclosure - Common Stock, Preferred Stock and Dividends</link:definition>
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<link:definition>022 - Disclosure - Business Segments</link:definition>
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<link:definition>023 - Disclosure - Geographic Information</link:definition>
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<link:definition>025 - Disclosure - Summary of Significant Accounting Policies and New Accounting Standards (Tables)</link:definition>
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<link:definition>026 - Disclosure - Statements of Operations-Additional Information (Tables)</link:definition>
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<link:definition>027 - Disclosure - Balance Sheets-Additional Information (Tables)</link:definition>
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<link:definition>028 - Disclosure - Acquisitions (Tables)</link:definition>
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<link:definition>029 - Disclosure - Debt (Tables)</link:definition>
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<link:definition>030 - Disclosure - Common Stock, Preferred Stock and Dividends (Tables)</link:definition>
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<link:definition>031 - Disclosure - Stock Option Plan (Tables)</link:definition>
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<link:definition>032 - Disclosure - Employee Benefit Plans (Tables)</link:definition>
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<link:definition>033 - Disclosure - Income Taxes (Tables)</link:definition>
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<link:definition>037 - Disclosure - Business Segments (Tables)</link:definition>
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<link:definition>040 - Disclosure - Summary of Significant Accounting Policies and New Accounting Standards (Detail Textuals)</link:definition>
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<link:definition>041 - Disclosure - Summary of Significant Accounting Policies and New Accounting Standards (Detail Textuals 1)</link:definition>
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<link:definition>045 - Disclosure - Balance Sheets-Additional Information (Details 1)</link:definition>
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<link:definition>046 - Disclosure - Balance Sheets-Additional Information (Detail Textuals)</link:definition>
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<link:definition>047 - Disclosure - Acquisitions (Details)</link:definition>
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<link:definition>048 - Disclosure - Acquisitions (Detail Textuals)</link:definition>
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<link:definition>049 - Disclosure - Debt - Summary of long-term debt (Details)</link:definition>
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<link:definition>050 - Disclosure - Debt - Aggregate maturities of long-term debt (Details 1)</link:definition>
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<link:definition>051 - Disclosure - Debt (Detail Textuals)</link:definition>
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<link:definition>052 - Disclosure - Common Stock, Preferred Stock and Dividends - Summary of preferred and common shares (Details)</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
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<link:definition>053 - Disclosure - Common Stock, Preferred Stock and Dividends (Detail Textuals)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
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<link:definition>054 - Disclosure - Stock Option Plan (Details)</link:definition>
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<link:definition>055 - Disclosure - Stock Option Plan (Detail Textuals)</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
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<link:definition>056 - Disclosure - Related Party Transactions (Detail Textuals)</link:definition>
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<link:definition>057 - Disclosure - Employee Benefit Plans - Changes in projected benefit obligation, plan assets and funded status (Details)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
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<link:definition>058 - Disclosure - Employee Benefit Plans - Change in Accumulated Other Comprehensive (Income) Loss (Details 1)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
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<link:roleType roleURI="http://www.pahc.com/role/EmployeeBenefitPlansNetPeriodicPensionExpenseDetails2" id="EmployeeBenefitPlansNetPeriodicPensionExpenseDetails2">
<link:definition>059 - Disclosure - Employee Benefit Plans - Net periodic pension expense (Details 2)</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
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<link:definition>060 - Disclosure - Employee Benefit Plans - Significant actuarial assumptions for plan (Details 3)</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
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<link:definition>061 - Disclosure - Employee Benefit Plans - Estimated future benefit payments including benefits attributable to future service (Details 4)</link:definition>
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<link:definition>062 - Disclosure - Employee Benefit Plans - Plan's target asset allocations and weighted average asset allocation of plan assets (Details 5)</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
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<link:definition>063 - Disclosure - Employee Benefit Plans - Fair values of plan assets by asset category (Details 6)</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
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<link:definition>064 - Disclosure - Employee Benefit Plans - Change in Fair Value of Level 3 Assets (Details 7)</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.pahc.com/role/EmployeeBenefitPlansDetailTextuals" id="EmployeeBenefitPlansDetailTextuals">
<link:definition>065 - Disclosure - Employee Benefit Plans (Detail Textuals)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.pahc.com/role/EmployeeBenefitPlansDetailTextuals1" id="EmployeeBenefitPlansDetailTextuals1">
<link:definition>066 - Disclosure - Employee Benefit Plans (Detail Textuals 1)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:definition>067 - Disclosure - Income Taxes - Income (loss) before income taxes (Details)</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:definition>068 - Disclosure - Income Taxes - Components of provision for income taxes (Details 1)</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:definition>069 - Disclosure - Income Taxes - Reconciliations of Federal statutory rate to effective tax rate (Details 2)</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
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<link:definition>070 - Disclosure - Income Taxes - Tax effects of significant temporary differences of deferred tax assets and liabilities (Details 3)</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
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<link:definition>071 - Disclosure - Income Taxes - Deferred taxes included in consolidated balance sheets (Details 4)</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
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<link:definition>072 - Disclosure - Income Taxes - Valuation allowance for deferred tax assets (Details 5)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
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<link:definition>073 - Disclosure - Income Taxes - Reconciliation of unrecognized tax benefits (Details 6)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
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<link:definition>074 - Disclosure - Income Taxes (Detail Textuals)</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:definition>075 - Disclosure - Commitments and Contingencies - Future minimum lease commitments (Details)</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
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<link:roleType roleURI="http://www.pahc.com/role/CommitmentsAndContingenciesDetailTextuals" id="CommitmentsAndContingenciesDetailTextuals">
<link:definition>076 - Disclosure - Commitments and Contingencies (Detail Textuals)</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
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<link:usedOn>link:definitionLink</link:usedOn>
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<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:definition>080 - Disclosure - Fair Value Measurements (Details 1)</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
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<link:usedOn>link:definitionLink</link:usedOn>
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<link:usedOn>link:definitionLink</link:usedOn>
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<link:definition>083 - Disclosure - Geographic Information (Details)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
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<link:definition>084 - Disclosure - Geographic Information (Details 1)</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<element name="LongTermDebtAndCapitalLeaseObligationsLessUnamortizedDebtDiscount" id="pahc_LongTermDebtAndCapitalLeaseObligationsLessUnamortizedDebtDiscount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
<element name="AgreementAxis" id="pahc_AgreementAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/>
<element name="AgreementDomain" id="pahc_AgreementDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="CreditAgreementMember" id="pahc_CreditAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>


<element name="TermALoansAndRevolvingCreditFacilityMember" id="pahc_TermALoansAndRevolvingCreditFacilityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>

<element name="BfiCoLlcMember" id="pahc_BfiCoLlcMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>


<element name="PercentageOfMaximumCommonStockOutstandingShares" id="pahc_PercentageOfMaximumCommonStockOutstandingShares" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>

<element name="IncentivePlan2008Member" id="pahc_IncentivePlan2008Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="CompensationAndBenefitForServicesMember" id="pahc_CompensationAndBenefitForServicesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>


<element name="DefinedBenefitPlanChangeInAccumulatedOtherComprehensiveIncomeLossRollForward" id="pahc_DefinedBenefitPlanChangeInAccumulatedOtherComprehensiveIncomeLossRollForward" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>



<element name="DefinedBenefitPlanDiscountRateForInterestCost" id="pahc_DefinedBenefitPlanDiscountRateForInterestCost" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="GlobalAssetAllocationOrRiskParityMember" id="pahc_GlobalAssetAllocationOrRiskParityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="OtherFundsMember" id="pahc_OtherFundsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="GlobalLargeCapEquitiesMember" id="pahc_GlobalLargeCapEquitiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="GlobalAssetAllocationOrRiskParityCommonCollectiveFundsMember" id="pahc_GlobalAssetAllocationOrRiskParityCommonCollectiveFundsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="GlobalSmallAndMidCapEquitiesMember" id="pahc_GlobalSmallAndMidCapEquitiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="MutualFundsFixedIncomeSecuritiesMember" id="pahc_MutualFundsFixedIncomeSecuritiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="GlobalAssetAllocationOrRiskParityMutualFundsMember" id="pahc_GlobalAssetAllocationOrRiskParityMutualFundsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="FixedIncomeSecuritiesOtherFundsMember" id="pahc_FixedIncomeSecuritiesOtherFundsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="GlobalAssetAllocationOrRiskParityOtherFundsMember" id="pahc_GlobalAssetAllocationOrRiskParityOtherFundsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="AmortizationOfUnrecognizedNetActuarialGainLossAndPriorServiceCostInNextTwelveMonths" id="pahc_AmortizationOfUnrecognizedNetActuarialGainLossAndPriorServiceCostInNextTwelveMonths" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
<element name="MinimumParValueRequiredForCorporateBondToDetermineDiscountRate" id="pahc_MinimumParValueRequiredForCorporateBondToDetermineDiscountRate" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
<element name="CashAndCashEquivalentsFairValueAssumptionInput" id="pahc_CashAndCashEquivalentsFairValueAssumptionInput" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
<element name="RetirementSavings401KPlanMember" id="pahc_RetirementSavings401KPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="DefinedBenefitPlansAndOtherPostretirementBenefitPlanMember" id="pahc_DefinedBenefitPlansAndOtherPostretirementBenefitPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="DomesticNoncontributoryDefinedBenefitPensionPlanMember" id="pahc_DomesticNoncontributoryDefinedBenefitPensionPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="TermOfVestingInEmployerContributions" id="pahc_TermOfVestingInEmployerContributions" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="DeferredProvisionBenefit" id="pahc_DeferredProvisionBenefit" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>

<element name="EffectiveIncomeTaxRateReconciliationWithholdingTaxForeignPercent" id="pahc_EffectiveIncomeTaxRateReconciliationWithholdingTaxForeignPercent" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="EffectiveIncomeTaxRateReconciliationForeignIncentiveTaxRates" id="pahc_EffectiveIncomeTaxRateReconciliationForeignIncentiveTaxRates" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="EffectiveIncomeTaxRateReconciliationAcquisitionRelatedChangeInDomesticValuationAllowance" id="pahc_EffectiveIncomeTaxRateReconciliationAcquisitionRelatedChangeInDomesticValuationAllowance" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="EffectiveIncomeTaxRateReconciliationChangeInUnrecognizedTaxBenefitsPercent" id="pahc_EffectiveIncomeTaxRateReconciliationChangeInUnrecognizedTaxBenefitsPercent" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="EffectiveIncomeTaxRateReconciliationExerciseOfEmployeeStockOptions" id="pahc_EffectiveIncomeTaxRateReconciliationExerciseOfEmployeeStockOptions" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="DeferredTaxAssetsEmployeeEnvironmentalRemediation" id="pahc_DeferredTaxAssetsEmployeeEnvironmentalRemediation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>

<element name="DeferredTaxAssetsValuationAllowanceRollForward" id="pahc_DeferredTaxAssetsValuationAllowanceRollForward" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="ProvisionForIncomeTaxes" id="pahc_ProvisionForIncomeTaxes" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
<element name="DeferredTaxAssetsNetOperatingLossUtilization" id="pahc_DeferredTaxAssetsNetOperatingLossUtilization" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
<element name="UnrecognizedTaxBenefitsIncreaseDecreaseResultingFromForeignCurrencyTranslation" id="pahc_UnrecognizedTaxBenefitsIncreaseDecreaseResultingFromForeignCurrencyTranslation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>




<element name="CommitmentsAndContingenciesTable" id="pahc_CommitmentsAndContingenciesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
<element name="CurrentAndLongTermLiabilitiesMember" id="pahc_CurrentAndLongTermLiabilitiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="CommitmentsAndContingenciesLineItems" id="pahc_CommitmentsAndContingenciesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="NumberOfPotentiallyResponsibleParties" id="pahc_NumberOfPotentiallyResponsibleParties" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="TermOfEmploymentAndSeveranceAgreement" id="pahc_TermOfEmploymentAndSeveranceAgreement" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="OptionsMember" id="pahc_OptionsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>

<element name="BusinessCombinationContingentConsiderationLiabilityRollForward" id="pahc_BusinessCombinationContingentConsiderationLiabilityRollForward" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="AdjustmentToDeferredConsideration" id="pahc_AdjustmentToDeferredConsideration" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
<element name="PaymentForContingentConsideration" id="pahc_PaymentForContingentConsideration" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
<element name="MfasAndOtherMember" id="pahc_MfasAndOtherMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="NutritionalSpecialtiesMember" id="pahc_NutritionalSpecialtiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="VaccinesMember" id="pahc_VaccinesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="MineralNutritionMember" id="pahc_MineralNutritionMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="PerformanceProductsMember" id="pahc_PerformanceProductsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization" id="pahc_AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
<element name="ReconciliationOfAdjustedEbitdaToIncomeBeforeIncomeTaxesAbstract" id="pahc_ReconciliationOfAdjustedEbitdaToIncomeBeforeIncomeTaxesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="GainLossOnInsuranceClaim" id="pahc_GainLossOnInsuranceClaim" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
<element name="LatinAmericaAndCanadaMember" id="pahc_LatinAmericaAndCanadaMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="EuropeAndAfricaMember" id="pahc_EuropeAndAfricaMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="OtherRegionMember" id="pahc_OtherRegionMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
<element name="CreditAgreementRequiredCovenantEarningsToBorrowingRatio" id="pahc_CreditAgreementRequiredCovenantEarningsToBorrowingRatio" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" abstract="false" nillable="true"/>
</schema>
