Setting New Standards for Excellence...
- high palatability
The following information is an excerpt from:
"Evaluating the Quality of Roasted
"Large Increases in milk production
are possible when early lactation cows are fed properly heated
soybeans. We conducted a large scale lactation study to measure
milk production when soybeans were heated to 295ºF and steeped
for 30 min (Faldet et al., 1991) Forty-six multiparous Holstein
cows were fed one of three total mixed diets from 15 to 119 d
postpartum with alfalfa silage as the only forage. Each diet
contained 50% forage and 50% concentrate on a DM basis. Diets
were formulated to be isonitrogenous by replacing corn and solvent
soybean meal with raw soybeans or heat-treated soybeans. The
proportion of protein supplement in the diet on a DM basis for
the three groups was 10% soybean meal, 13% raw soybeans, or 13%
heat-treated soybeans. The soybean meal diet was fed to all cows
during week 1 and 2 postpartum for covariate adjustment of dry
matter intake and milk production. Intake of DM was similar across
heat-treated soybeans supported more milk (9.9 lbs/d), 3.5% FCM
(8.8lbs/d), and milk protein (.2 lbs/d) than soybean meal or
Milk fat percentage was not altered
by treatments. However, milk protein percentage was depressed
in cows fed heat-treated soybeans compared with soybean meal
(2.85 vs. 2.99%, respectively).
"A large number of lactation studies have been conducted with heat processed soybeans and there is little doubt that well roasted soybeans can be a very effective supplement for lactating cows, particularly when alfalfa silage or hay are the principal forage."
Cows fed finely ground, roasted soybeans excreted 0.37 ounces of soybean particles per pound of fecal dry matter and produced 81.4 pounds of milk per day. On the other hand, cows fed roasted soybeans in half and one-fourth sizes excreted more soybean particles - 1.17 ounces of soybean particles per pound of fecal dry matter - but producesd 85.1 pounds of milk per day - almost 4 pounds more than cows fed finely ground, roasted soybeans.
Although finely ground, roasted soybeans resulted in less soybean particles lost in the feces, these soybeans were degraded more rapidly in the rumen than soybeans in half or one-fourth sizes. Thus, the protein in finely ground, roasted soybeans was less available to the cow, which was reflected in lowered milk production.
Bottom line: Feed roasted soybeans split in half or one-fourth pieces for optimal milk production.