Feed Strategy - July 2018 - 35
FeedStrategy ❙ 35
cent alfalfa haylage, and the ratio of
starch from ground corn and rolled
barley within each treatment was
100:0, 67:33, 33:67 and 0:100.
There was no difference in cow
performance between diets: dry
matter intake (59.7 lbs./day), milk
production (92.9 lbs./d), energy-corrected milk (91.5 lbs./d), milk protein yield (2.72 lbs./d), milk fat yield
(3.20 lbs./d) or feed efficiency (1.53)
were not affected by starch type.
Corn silage or grass silage
Similarly, Canadian researchers evaluated the effects of forage source (corn silage vs. grass
silage) on milk production of
cows fed canola meal. This study
was published in the American
Dairy Science Association Annual
Meeting held in Pittsburg in 2017.
The diets were formulated to
include either 54.2 percent of corn
silage or 36.6 percent of grass silage
and 27.4 or 20.6 percent of canola
meal on a DM basis, respectively.
The diets contained the same level
of energy (0.72 megacalories/lbs.)
and protein (16.0 percent crude protein). The researchers found cows
eating grass silage-based diets performed better.
Comparing with corn silagebased diet, cows fed the grass
silage-based diets increased milk
production (110.2 vs. 103.7 lbs./day),
increased milk fat yield (3.951 vs.
3.639 lbs./day) and reduced intake
(58.4 vs. 62.0 kg/day). However,
milk protein yield was not affected
July 2018 ❙ www.WATTAgNet.com
by diet (3.065 lbs./day).
In conclusion, these results show
that canola meal perform better in
low-forage, high-starch, and grass
silage-based diets. ◼
Fernando Diaz works as a
dairy nutrition and management
consultant at Rosecrans Dairy
Consulting, LLC. He can be
reached at email@example.com.