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022 Effects of Gradual Reduction on Frequency of Energy Supplementation on Growth and Immunity of Stressed Calves

Silva, G. M ; Moriel, P ; Henson, N ; Ranches, J ; Santos, G ; Poore, M. H

Journal of animal science, 2016-12, Vol.95 (suppl_1), p.11-11 [Periódico revisado por pares]

Oxford University Press

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  • Título:
    022 Effects of Gradual Reduction on Frequency of Energy Supplementation on Growth and Immunity of Stressed Calves
  • Autor: Silva, G. M ; Moriel, P ; Henson, N ; Ranches, J ; Santos, G ; Poore, M. H
  • É parte de: Journal of animal science, 2016-12, Vol.95 (suppl_1), p.11-11
  • Descrição: Abstract This study evaluated the effects of gradual reduction on frequency of energy supplementation following vaccination on growth and measurements of innate and humoral immunity of beef steers. At 14 d post-weaning (d 0), Angus steers (n = 42; 200 ± 5 kg of BW; 175 ± 4 d of age) were stratified by BW, and randomly assigned to 1 of 14 drylot pens (3 steers/pen). From d 0 to 42, steers were provided ground tall fescue hay ad libitum (57% TDN, 13% CP of DM) and supplemented with concentrate at 1% of BW (50:50 soybean hulls and corn gluten feed; 71% TDN, 15% CP of DM; DM basis). Treatments were randomly assigned to pens, and consisted of similar weekly concentrate DM offer (1% of BW times 7 d) that was divided and offered daily from d 0 to 42 (7X; 4 pens), 3 times weekly from d 0 to 42 (3X; Monday, Wednesday, and Friday; 5 pens), or daily from d 0 to 14, and then 3 times weekly from d 15 to 42 (7-3X; 5 pens). Steers were vaccinated against infectious bovine rhinotracheitis (IBR), bovine viral diarrhea virus (BVDV), parainfluenza-3 (PI-3), Mannheimia haemolytica and clostridium on d 0 and 15. Individual BW was measured before feeding on d 0 and 42, following 12 h of feed and water withdrawal. Blood samples were collected via jugular venipuncture 4 h after concentrate supplementation on d 0, 1, 2, 3, 7, 15, 16, 17, 18, 22, and 42. Mean BW, ADG, G:F, hay DMI, and total DMI over the 42-d period did not differ among treatments (P ≥ 0.26). Plasma concentrations of cortisol and mean serum BVDV-1 titers also did not differ among treatments (P ≥ 0.35), but overall plasma haptoglobin concentrations were greater for 3X vs. 7-3X and 7X steers (P ≤ 0.05; 0.44, 0.37, and 0.33 ± 0.026 mg/mL, respectively). Also, 3X steers had less mean serum IBR titers (P ≤ 0.05; 0.29 vs. 0.88 and 0.79 ± 0.179 log2, respectively) and less seroconversion to PI-3 virus on d 15 than 7-3X and 7X steers (P ≤ 0.05; 36.0 vs. 76.6 and 57.8 ± 8.24%, respectively). In summary, a gradual reduction on frequency of energy supplementation during a 42-d preconditioning period did not impact growth, but alleviated inflammation and prevented detrimental effects on vaccine response against BVDV and PI-3 compared to steers fed 3 times weekly during the entire study.
  • Editor: Oxford University Press
  • Idioma: Inglês
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