Abstract #440

Section: Ruminant Nutrition
Session: Ruminant Nutrition V
Format: Oral
Day/Time: Tuesday 4:45 PM–5:00 PM
Location: 318
# 440
Dry period plane of energy and periparturient disease status: Effects on feed intake, energy balance, milk production, and milk composition.
A. Pineda*1, F. C. Cardoso1, J. K. Drackley1, 1Uiniversity of Illinois, Urbana, IL.

The aim of the study was to assess the effects of energy intake during the dry period on cows that suffered non-disease (ND) or disease (DD; displacement of abomasum, retained placenta, metritis, or milk fever) postpartum. Twenty-nine multiparous Holstein cows dried-off 50 d before calving were blocked by parity, body weight (BW), and body condition score (BCS), and then randomly assigned to 1 of 2 dietary treatments: controlled energy (CE; NEL = 1.39 Mcal/kg; n = 17) or higher-energy (HE; NEL = 1.58 Mcal/kg; n = 12) to supply 100 or ~150% of energy (NEL) requirements at ad libitum intake, respectively. After calving all cows were fed the same lactation diet. Cows were individually fed and remained in the study until 28 d after calving. At dry-off, BW was similar (P = 0.15) among treatments but DD cows postpartum had greater (P = 0.01) initial BW than ND (820 vs. 735 kg). Prepartum intakes of NEL (16.5 and 20.2 Mcal/d) and energy balance (EB) were greater (P < 0.05) in HE than CE. Significant interaction of diet and time (P = 0.03) showed greater decrease in EB 2 wk prior calving in HE than CE. Postpartum, cows fed HE tended (P = 0.08) to lose more BW, had greater BCS (P = 0.05), but lost more BCS (0.53 and 0.21; P = 0.02) than CE. Cows DD postpartum lost more BW (P = 0.03), had lower BCS (P = 0.01), and lost more BCS (P = 0.05) than ND. Cows fed CE tended (P = 0.10) to have greater intakes of dry matter (DM) and NEL postpartum than HE. Cows ND had greater (P < 0.01) DM and NEL intakes than DD. Cows that were DD but fed CE (n = 6) had greater (P < 0.05) intakes of DM and NEL than DD cows fed HE (n = 5). Postpartum EB was greater (P = 0.04) in ND than DD cows. Dietary treatment had no effects (P > 0.20) on milk yield or milk components. Cows ND had greater (P < 0.05) milk yield, milk protein concentration and yield, and lactose concentration and yield than DD. High-BW cows were more likely to suffer DD and performed poorly. Cows fed CE diet prepartum had lesser decrease in EB 2 wk before calving followed by lower BW and BCS losses and greater intakes of DM and NEL postpartum. Among DD cows, those previously fed CE showed benefits in DM and NEL intakes compared with those fed HE.

Key Words: dairy cow, dry period, energy intake