Yes there will be a conflict. You will need this as well:

package Beef;

use vars qw(@ISA);    #if you use strict
@ISA  = qw(Cow);
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Which is why it's wise to plan out your inheritance tree before you start coding. OOP is only as good as its design.

To be technical, Beef IS NOT a Cow - a Cow HAS Beef. Take a look into aggregation for alternatives to inheritance.

Jeff

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
F--F--F--F--F--F--F--F--
(the triplet paradiddle)