Maternal pre- and postpartum supplementation of a Bacillus-based DFM enhanced cow and calf performance.

Autor:	Izquierdo VS; Range Cattle Research and Education Center, IFAS, University of Florida, Ona, FL 33865, USA., Cappellozza BI; Chr. Hansen A/S, Hørsholm, 2970, Denmark., Silva JVL; Range Cattle Research and Education Center, IFAS, University of Florida, Ona, FL 33865, USA., Santos GCM; Range Cattle Research and Education Center, IFAS, University of Florida, Ona, FL 33865, USA., Miranda A; Range Cattle Research and Education Center, IFAS, University of Florida, Ona, FL 33865, USA., Bittar JHJ; College of Veterinary Medicine, University of Florida, Gainesville, FL 32610, USA., Pickett A; Department of Animal Science, Texas A&M University, College Station, TX 77843, USA., Mackey S; Department of Animal Science, Texas A&M University, College Station, TX 77843, USA., Cooke RF; Department of Animal Science, Texas A&M University, College Station, TX 77843, USA., Vendramini JMB; Range Cattle Research and Education Center, IFAS, University of Florida, Ona, FL 33865, USA., Moriel P; Range Cattle Research and Education Center, IFAS, University of Florida, Ona, FL 33865, USA.
Jazyk:	angličtina
Zdroj:	Journal of animal science [J Anim Sci] 2024 Jan 03; Vol. 102.
DOI:	10.1093/jas/skae110
Abstrakt:	This study evaluated the effects of maternal supplementation of a Bacillus-based direct-fed microbial (DFM) on the physiology and growth performance of Bos indicus-influenced cow-calf pairs. On day 0 (~139 d before expected calving date), 72 fall-calving, Brangus crossbred beef heifers (20 to 22 mo of age) pregnant with first offspring were stratified by their initial body weight (BW; 431 ± 31 kg) and body condition score (BCS; 6.0 ± 0.36; scale 1 to 9), and randomly allocated into 1 of 12 bahiagrass pastures (1 ha and six heifers per pasture). Treatments were randomly assigned to pastures (six pastures per treatment) and consisted of heifers supplemented with 1 kg/d of soybean hulls (dry matter, DM) that was added (BAC) or not (CON) with DFM containing Bacillus subtilis and B. licheniformis (Bovacillus; Chr. Hansen A/S, Hørsholm, Denmark). Treatments were provided from days 0 to 242 (139 ± 4 d prepartum to 104 ± 4 d postpartum). Calves were weaned on day 242 (96 ± 30 d of age) and then allocated into 1 of 16 drylot pens and fed the same concentrate at 3.25% of BW (DM) until day 319. Maternal treatment effects were not detected (P ≥ 0.29) for herbage allowance and forage chemical composition. Heifer BCS on days 39 and 63 tended (P ≤ 0.09) to be greater for BAC vs. CON heifers, whereas heifer BCS on day 91 was greater (P = 0.01) for BAC vs. CON heifers. Heifer BCS did not differ (P ≥ 0.20) between treatments on days 179 and 242. Plasma glucose concentration did not differ from days 0 to 63 (P ≥ 0.14) but were greater (P < 0.01) on day 179 and tended (P = 0.09) to be greater on day 242 for BAC vs. CON heifers. Calf BW at birth, ADG from birth to weaning, and BW at weaning did not differ (P ≥ 0.19) between treatments, but calf BW at drylot exit (day 319) was greater (P = 0.05) for BAC vs. CON calves. Maternal treatment effects were not detected (P ≥ 0.42) for calf serum concentration of IgG at birth and postvaccination plasma concentrations of glucose, cortisol, and haptoglobin. Serum titers against bovine respiratory syncytial virus (BRSV) were greater (P = 0.04) for BAC vs. CON calves on day 287, whereas seroconversion against parainfluenza-3 virus (PI-3) was greater (P < 0.01) for BAC vs. CON calves on day 271. Thus, maternal supplementation of a Bacillus-based DFM increased prepartum BCS gain and postpartum plasma glucose concentration of heifers and led to positive carryover effects on postweaning BW gain and humoral immune response in their offspring. (© The Author(s) 2024. Published by Oxford University Press on behalf of the American Society of Animal Science. All rights reserved. For commercial re-use, please contact reprints@oup.com for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site—for further information please contact journals.permissions@oup.com.)
Databáze:	MEDLINE
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