highly significantp < 0.001
(3) HA (g) = 202.0-34 .09X 1 -0 .38X 2 +0 .952X 1 2 -0 .0140X 2 2 +0 .2553X 1 X 2 (4) CO=0.167-0 .0215X 1 +0 .01675X 2 -0 .00044X 1 2 -0 .000099X 2 2 +0 .000125X 1 X 2 (5) AD (g.s) =1276+108 .6X 1 +19 .53X 2 -1 .537X 1 2 -0 .0355X 2 2 -1 .329X 1 X 2 In the HA and AD models, the linear term of the BW concentration (X 1 ) and IL (X 2 ) together with the interactions BW × IL were shown to be highly significant factors ( p < 0.001).