ABSTRACT
Objective
This study aimed to evaluate the effects of a combination of live yeast and yeast
cell wall fed before weaning and through backgrounding on heifer growth performance,
health, and body temperature.
Materials and Methods
Angus crossbred cow-calf pairs with heifer calves (n = 95; BW = 165 ± 27 kg) were
stratified based on BW, birth date, sire, and dam parity and assigned randomly to
pasture (10 pastures, 9 or 10 cow-calf pairs/pasture). Pastures were assigned randomly
to treatments: (1) no yeast (CON) or (2) addition of 3 g of live yeast and 1 g of
yeast cell wall (Y+CW; Phileo by Lesaffre) in a randomized design with 5 replicates.
Calves were offered creep-feed at 0.5% of BW (as fed) for 35 d before weaning. Heifers
remained in preweaning treatment groups and were fed 1.8 kg/d of a concentrate supplement
while grazing bermudagrass (Cynodon dactylon) pastures for 42 d with Y+CW continuing to provide 4 g of Y+CW per day.
Results and Discussion
Average daily gain and creep-feed consumption before weaning did not differ (P ≥ 0.29) between treatments. However, CON heifers had greater (P = 0.01) ADG from weaning to the end of the backgrounding period compared with Y+CW
heifers. Body temperatures were not affected (P ≥ 0.31) by treatment before or after weaning. White blood cell concentrations, serum
haptoglobin concentrations, and the percentage of cells positive for phagocytic activity
did not differ (P ≥ 0.15) between CON and Y+CW heifers.
Implications and Applications
Based on the results of this study, Y+CW supplementation before or following weaning
was not efficacious.
Key words
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Article info
Publication history
Accepted:
August 16,
2021
Received:
April 27,
2021
Footnotes
At the time of the study, 2 of the authors were employed by Phileo by Lesaffre, which provided product for this research. The other authors declare no conflicts of interest.
Identification
Copyright
© 2021 American Registry of Professional Animal Scientists. Published by Elsevier Inc. All rights reserved.
