Researcher

Supplementation^a

Summary of Effects

 Christenson et al., 1967

HE vs. LE for 140 d Prepartum 

HE increased birth wt.,dystocia, milk & estrus activity

Dunn et al. 1969

ME vs LE for 120 d prepartum

ME increased birth wt. 
and dystocia

Bellows et al. 1972

HE VS LE for 82 d prepartum

HE increased birth wt but 
had no effect on dystocia 
or weaning wt.

Laster & Gregory, 1973

HE vs ME vs LE for 90 d prepartum

HE increased birth wt 
but had no effect on dystocia

Laster, 1974

HE vs ME vs LE for 90 d prepartum

HE increased birth wt. 
but had no effect on dystocia

Corah et al. 1975

ME vs LE for 100 d prepartum

ME increased birth wt., 
estrus activity, calf vigor 
and weaning wt. but 
had no effect on dystocia

Bellows and Short, 1978

HE vs LE for 90 d prepartum

 HE increased birth wt., 
estrus activity, pregnancy 
rate and decreased 
post partum interval but 
had no effect on dystocia

Anderson, et al. 1981

HE vs LE for 90 d prepartum

HE had no effect on 
birth wt., milk or 
weaning wt.

Houghton et al., 1986

ME vs. LE for 100 d prepartum

ME increased birth wt. & weaning wt. 
but had no effect on 
dystocia