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Title: INFLUENCE OF COW PARITY AND GENETIC POTENTIAL FOR MILK PRODUCTION ON FORAGEINTAKE OF BRANGUS FEMALES DURING LATE LACTATION

Author
item JOHNSON, C - OKLAHOMA STATE UNIVERSITY
item LALMAN, D - OKLAHOMA STATE UNIVERSITY
item BROWN, MICHAEL
item Appeddu, Lisa

Submitted to: Journal of Animal Science
Publication Type: Abstract Only
Publication Acceptance Date: 1/1/2002
Publication Date: 3/18/2002
Citation: JOHNSON, C.R., LALMAN, D.L., BROWN, M.A., APPEDDU, L.A. INFLUENCE OF COW PARITY AND GENETIC POTENTIAL FOR MILK PRODUCTION ON FORAGEINTAKE OF BRANGUS FEMALES DURING LATE LACTATION. JOURNAL OF ANIMAL SCIENCE. 2002. Vol. 80(Suppl. 2): Abstract p. 97.

Interpretive Summary: Abstract Only.

Technical Abstract: Brangus females (n=24) were used to evaluate the effects of cow parity (multiparous vs first-calf heifers; COW vs HFR) and genetic potential for milk production (MPP; HIGH vs LOW) on forage DMI. Females were selected for MPP based on their sire's EPD for milk. Initial weights were 550 and 461±12 kg for COW and HFR. Females were allotted to two periods by postpartum interval, each period averaging 166 d postpartum. Effects in the model included parity group and MPP, and period was considered a random effect. Cow-calf pairs were individually penned and bermudagrass hay (5.7% CP and 76.6% NDF; DM basis) was offered ad libitum (130% of previous 2-d average intake). Cottonseed meal was offered .4 (COW) and .45% (HFR) of BW to ensure adequate protein supply. Females were offered hay during 4-h feeding bouts at 0730 and 1800. Between feedings, all cows and calves had access to water and trace-mineralized salt. Hay, orts, and waste were collected for each feeding. Milk production was determined on d 7 using a portable milking machine, following a 12-h separation from calves. Acid detergent insoluble ash was used to estimate DM digestibility (DMD). Selection for MPP did not influence milk production (6.7±.8kg/d; P>.2) during late lactation. A parity group by MPP interaction was observed for forage DM intake per day (P=.05). Heifers with low MPP consumed 18% less forage DM compared to the mean of LOW and HIGH COW and HIGH HFR. When forage intake was expressed as a percent of body weight, neither parity nor MPP influenced intake (2.2±.07% BW; P>.3). A parity group by MPP interaction was observed for DMD (P<.05). The LOW HFR group had 10% lower apparent DMD compared with the average of all others. During late lactation, neither parity group nor selection of females for divergent MPP influenced forage