Table 6.

Calving, weaning, and preconditioning responses from offspring of beef cows receiving diets containing CSSO (n = 52) or CON (n = 52) during the last trimester of gestation¹

Item	CON	CSSO	SEM	P-value
Calving results
Calving rate, %	100	100	—	—
% of male calves born	56.6	51.0	7.0	0.57
Calf birth weight, kg	37.0	37.7	0.6	0.42
Adjusted calf birth weight2, kg	38.3	39.1	0.6	0.36
Colostrum IgG, mg/mL	373	423	15	0.02
Calf plasma IgG 24 h after birth, mg/mL	55.7	97.9	9.0	< 0.01
Weaning results
Weaning rate, %	96.0	100	2.0	0.17
% of male calves weaned	56.9	51.0	7.0	0.56
Calf weaning age, d	209	209	0.1	0.91
Calf weaning weight, kg	262	264	4	0.72
Calf 205-d adjusted weaning weight2, kg	267	270	4	0.57
Preconditioning results
ADG, kg/d	0.68	0.67	0.05	0.84
Final BW, kg	287	289	4	0.77

¹Cows received (dry matter basis) 195 g/cow daily of CSSO (Essentiom; Church and Dwight Co., Inc., Princeton, NJ) or 170 g/cow daily of CON (Energy Booster 100; Milk Specialties, Eden Prairie, MN). Treatments were provided from day 0 (day 195 of gestation) to calving. Calves were weaned on day 290 of the experiment, preconditioned for 35 d (day 291 to 325), and transferred to a feedyard (Cannon Hill Feeders LLC., Nyssa, OR) where they remained until slaughter (day 514). All BWs collected were unshrunk.

²According to BIF (2010).