Additive was added to
the feed by replacing the same amount of CaCO3. Over the
gestation periods, individual feed allowances were intended
to provide at farrowing a 20-mm back fat thickness and a
body weight adjusted on parity.During pregnancy the
experimental animals were housed in environmenta controlled, slatted-floored individual gestation crates in an
enclosed facility with temperaturesa veraging 21 4 C