Eects of corn processing on performance of
prepartum and early postpartum dairy cattle. H. M. Dann*,
G. A. Varga, D. E. Putnam, and L. C. Griel Jr., The Pennsylvania State
University, University Park.
An experiment was conducted to assess the eects of feeding cracked corn
(C) or steam flaked corn (F) on prepartum and postpartum dry matter intake
(DMI), body weight (BW), and body condition score (BCS) and postpartum
milk yield and composition. Multiparous Holstein cows were assigned
to treatments in a 22 factorial arrangement. The treatments were cracked
corn prepartum and cracked corn postpartum (CC); cracked corn prepartum
and steam flaked corn postpartum (CF); steam flaked corn prepartum and
cracked corn postpartum (FC); and steam flaked corn prepartum and steam
flaked corn postpartum (FF). Treatments started 28 d prior to expected calving
date and continued until 42 d postpartum. All cows were fed a TMR ad
libitum: prepartum, a TMR with a forage:concentrate of 64:36, 1.6 Mcal/kg
NEL and 13.6% crude protein (CP) was fed; postpartum, a TMR with a forage:
concentrate of 50:50, 1.62 Mcal/kg NEL and 16.5% CP was fed. The
prepartum ration contained 21% corn and the postpartum ration contained
24% corn. Using a split-plot analysis, least square means for DMI, BW, milk
yield, and milk composition were unaected (P>.05) by treatment. Prepartum
corn source did not aect postpartum performance. A trend for higher
milk yield (P<.14) was observed in cows fed steam flaked corn during early
lactation.
Prepartum Postpartum SEM
Treatment C F CC CF FC FF
n 33 32 13 14 15 15
DMI, kg/d 13.6 14.6 18.7 18.1 20.2 18.9 0.82
Body weight, kg 754 759 645 658 674 668 17.0
Body condition score 3.45 3.45 2.87ab1 3.00ab 3.06a 2.81b 0.10
Milk yield, kg/d 40.9 42.7 41.6 44.0 1.45
Milk fat, % 3.69 3.59 3.86 3.52 0.16
Milk fat, kg/d 1.57 1.62 1.67 1.62 0.10
Milk protein, % 2.89 2.94 2.98 2.87 0.06
Milk protein, kg/d 1.24 1.33 1.30 1.33 0.05
Milk lactose, % 4.79 4.77 4.79 4.82 0.07
Milk lactose, kg/d 2.06 2.17 2.10 2.24 0.08
1Means with different superscripts are significantly different (P<.05)
Key Words: Corn Processing, Transition Cow
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