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1261
Effect of pre- and postnatal trace mineral (TM) source on Angus and Brangus heifer growth and body composition

Thursday, July 21, 2016: 4:15 PM
151 E/F (Salt Palace Convention Center)
Deborah M. Price , Department of Animal Sciences, University of Florida, Gainesville, FL
Meaghan M O'Neil , Department of Animal Sciences, University of Florida, Gainesville, FL
Wayne B Watson III , Department of Animal Sciences, University of Florida, Gainesville, FL
Roger West , College of Veterinary Medicine, University of Florida, Gainesville, FL
Dr. Owen Rae , College of Veterinary Medicine, University of Florida, Gainesville, FL
Dr. Max Irsik , College of Veterinary Medicine, University of Florida, Gainesville, FL
Matt Hersom , Department of Animal Sciences, University of Florida, Gainesville, FL
Joel V. Yelich , Department of Animal Sciences, University of Florida, Gainesville, FL
Audio File Recorded Presentation (mp4)
Abstract Text:

A 2 by 2 factorial design evaluated growth and body composition in Angus (n = 40) and Brangus (n = 40) heifers born to cows supplemented with either inorganic (n = 40, 20/breed) or organic (n = 40, 20/breed) TM sources. The TM was initiated 82 ± 2 d pre-calving and resultant calves were weaned, and blocked by maternal TM source, age, sire, and weaning BW, and randomly assigned to 10 pens (5 pens/TM) for a 168 d development period. The TM supplement was pen fed 3 d/wk at 0.4 kg•454 kg BW-1•heifer-1•d-1. Heifer BW and BCS (scale 1-9) were collected every 28 d. Ultrasound LM area (LMA), 12th rib back fat thickness (FAT), and LM intramuscular fat percentage (IMF) were recorded every 84 d. Statistical analysis used heifer as the experimental unit and repeated measures PROC MIXED to analyze BW, BCS, and ultrasound measurements. Fixed effects included TM, breed, day, and interactions. Results are presented as LSM ± pooled SE. At trial start, BW did not differ (P > 0.05) by TM or breed in inorganic, organic, Angus or Brangus (217, 224, 218, 223 ± 3 kg, respectively) heifers; however, organic and Brangus heifers had greater (P ≤ 0.01; 4.6 ± 0.04) BCS than inorganic and Angus (4.4 ± 0.04). On d 84, organic (276 ± 4 kg) had greater (P ≤ 0.05) BW than inorganic (261 ± 4 kg) heifers, while Angus and Brangus BW did not differ (P > 0.05). The BCS did not differ (P > 0.05) by TM or breed on d 84 (4.9 ± 0.04) and d 168 (5.4 ± 0.1). On d 168, BW did not differ (P > 0.05) by TM or breed in inorganic, organic, Angus, or Brangus (328, 338, 329, 337 ± 5 kg, respectively) heifers. No TM, breed, or interaction affected (P > 0.05) the 168 d ADG. The TM had no effect (P > 0.05) on IMF, FAT, or LMA. Breed did not affect (P > 0.05) FAT. Angus had greater (P ≤ 0.05) IMF, but lesser LMA (P ≤ 0.01) than Brangus (4.80 vs 3.44 ± 0.12 % and 43.99 vs. 49.67 ± 0.89 cm2, respectively) when pooled across days. The TM source administered to cows during the last 1/3 of gestation did not affect heifer BW, BCS, or body composition over a 168 d post-weaning development period.

Keywords:

heifers, trace minerals, performance, ultrasound

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