108 Effects of post-weaning supplementation of immunomodulatory feed ingredient on cortisol concentrations and microbial populations in programmed fed beef heifers

Autor:	Jesse Thompson, R. E. Ricks, Jessica L Danielo, Keelee J McCarty, Nathan M. Long, J. E. Tipton
Rok vydání:	2019
Předmět:	Salmonella Meal animal structures animal diseases Sire General Medicine Biology medicine.disease_cause biology.organism_classification Clostridia Abstracts Ingredient Animal science Genetics medicine Post weaning Animal Science and Zoology Once daily Feces Food Science
Zdroj:	J Anim Sci
ISSN:	1525-3163 0021-8812
Popis:	The objective was to determine the effects of immunomodulatory feed ingredient during post-weaning on cortisol concentration and fecal microbial populations of beef heifers. Commercial Angus heifers (n = 72) from two AI sires were blocked (n = 9) by sire and BW, randomly assigned to one of two pens (4 heifers/pen) per block, then assigned to treatments. Heifers were fed twice daily from d 0 to 60 (gain 0.75 kg/day) and top-dressed once daily with either 72g of Celmanax (CEL) or corn germ (CON; corn germ meal) per pen. After 60 days, two heifers per pen (n = 32) were randomly selected for a transportation challenge. Fecal grab samples were collected on d 0 and 69 of treatment, hr -24, 0, 24 of the challenge and 7 d post-challenge. Serum samples were collected at h 0, 4, 8, and 12 of the challenge. Clostridia and E. coli were enumerated from fecal samples using selective media. Isolates (≤ five isolates from each media per sample) were genetically tested to determine if they were C. perfringens or pathogenic E. coli. Fecal samples were enriched for detection of Salmonella. Pen was the experimental unit and data was analyzed by ANOVA or repeated measures analysis. Following treatment, decreased (P ≤ 0.05) populations of total E. coli, Salmonella, and C. perfringens were observed in CEL heifers compared to CON heifers, whereas clostridia and pathogenic E. coli were not different (P > 0.05) between treatments. Transportation stress increased (P ≤ 0.05) populations of clostridia, C. perfringens, total E. coli, and Salmonella, but decreased (P = 0.0252) pathogenic E. coli counts. Cortisol concentrations were decreased (P < 0.05) in CEL heifers compared to CON heifers throughout the challenge. In summary, supplementation of Celmanax post-weaning altered microbial populations and cortisol concentrations were reduced during transportation in beef heifers.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::48096d10ebb261b1ff6c1b7b27b4cb74 https://doi.org/10.1093/jas/skz053.096 Zobrazit plný text záznamu