ABSTRACT
A 6-wk randomized design trial with a 4 × 2 factorial arrangement of treatments was
conducted to evaluate the production response of 48 Holstein lactating cows fed diets
based on corn or forage sorghum silage harvested in the summer or fall and supplemented
with soybean meal (SBM) or mechanically pressed cottonseed meal (CSM). Corn was planted
in April and harvested in July (CSS), and a second crop was planted in August and
harvested in November (CSF). Forage sorghum was planted in April, harvested in July
(FSS), allowed to ratoon, and harvested again in November. Forages provided 41.67%
of the dietary DM in the experimental diets, and CSM replaced a portion of the N provided
by SBM. Cows were fed a corn silage–based diet for 2 wk before beginning the 4-wk
experimental period. No differences were observed in DMI or milk yield among treatments.
An interaction of forage source and protein supplement was observed for milk fat,
which was lowest for CSF-CSM compared with the other treatments. No differences were
observed in yield or concentration of milk protein, lactose, or solids-not-fat. An
interaction was observed for efficiency of milk production, which was lowest for CSS-SBM
and CSF-CSM compared with the other treatments. Concentrations of milk urea nitrogen
were less for diets based on corn silage compared with forage sorghum and for CSM
compared with SBM. Results of this trial indicate that diets based on corn silage
or forage sorghum harvested in spring or fall and supplemented with CSM or SBM can
support similar performance.
Key words
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Article info
Publication history
Accepted:
February 14,
2017
Received:
December 16,
2016
Identification
Copyright
Copyright © 2017, American Registry of Professional Animal Scientists. All rights reserved.
