Table 3.

Overall bloat score (0 to 5; Bartley, 1965), and incidence of each score, of rumen-cannulated heifers receiving a bloat-inducing diet, and supplemented or not (CON; n = 16) with Yucca schidigera extract (Micro-Aid; DPI Global, Porterville, CA) at (as-fed basis) 1 g/heifer daily (YS1; n = 16), 2 g/heifer daily (YS2; n = 16), or 4 g/heifer daily (YS4; n = 16)¹

						Contrasts (P-value)2
Item	CON	YS1	YS2	YS4	SEM	M inclusion	Linear	Quadratic
Mean bloat score	1.21	1.25	1.32	1.27	0.08	0.20	0.38	0.19
Score 0, %	38.1	39.3	33.1	36.0	2.81	0.52	0.38	0.44
Score 1, %	11.0	8.83	12.8	9.91	1.89	0.79	0.93	0.60
Score 2, %	42.0	42.5	42.3	45.8	3.77	0.63	0.31	0.70
Score 3, %	8.51	7.95	11.1	8.36	3.38	0.71	0.87	0.29
Score 4, %	0.392	2.07	0.076	0.00	0.621	0.60	0.15	0.15

¹Heifers were assigned to a 4 × 4 Latin square design, containing 4 period of 28 d each and a washout interval of 14 d between periods. Heifers received diets at 2% of their initial BW (as-fed basis), and completely consumed their diets within an 8-hr period. Feed efficiency was calculated using total BW gain and total feed intake of each heifer within each period. Bloat was scored daily 3 hr after the morning feeding.

²Orthogonal contrasts were tested to determine an overall effect of Y. schidigera extract supplementation (M inclusion; CON vs. YS1 + YS2 + YS4), and if inclusion of Y. schidigera extract (0, 1, 2, or 4 g/heifer daily) yielded linear of quadratic effects.