Document Detail

Effects of an extract of plant flavonoids (Bioflavex(R)) on rumen fermentation and performance in heifers fed high-concentrate diets.
MedLine Citation:
PMID:  22829622     Owner:  NLM     Status:  Publisher    
To study the effects of an extract of plant flavonoids (Bioflavex(®)) in cattle fed high-concentrate diets, 2 experiments were designed. In the first experiment, the effects of Bioflavex(®) (FL) on the development of rumen acidosis was evaluated in 8 Holstein-Friesian crossbreed heifers (451 SEM 14.3 kg of BW) using a crossover design. Each experimental period lasted 22 d; from day 1 to 20, the animals were fed rye grass, on day 21 the animals were fasted and, on day 22, rumen acidosis was induced by applying 5 kg of wheat without (CTR) or with flavonoids (FL, 300 mg/kg DM) through a rumen cannula. Rumen pH was recorded continuously (from day 19 to day 22). On day 22, average rumen pH was significantly (P < 0.01) higher in the FL animals (6.29 SEM 0.031) than it was in the CTR heifers (5.98 SEM 0.029). After the wheat application, the rumen VFA concentration increased (P < 0.01), the proportion of acetic acid decreased (P < 0.01), and lactate concentration (mmol/L) increased, but the increase was not as great (P = 0.09) in the FL as it was in the CTR heifers (0.41 to 1.35mmol/L; SEM 0.24). On day 22, Streptococcus bovis and Selenomonas ruminantium titers increased after the wheat application, but Megasphaera elsdenii titers increased (P < 0.05) in the FL heifers, only. In the second experiment, the effect of Bioflavex(®) (FL) on the performance and rumen fermentation in finishing heifers were evaluated. Forty-eight Fleckvieh heifers (initial BW = 317 SEM 5.34) were used in a completely randomized design. Heifers were assigned to 1 of 4 block based on their BW and, within each block, assigned to one of two pens (6 heifers/pen). In addition, 16 heifers (2/pen) were rumen cannulated. Individual BW and group consumption of concentrate and straw were recorded weekly until the animals reached the target slaughter weight. Supplementation with FL did not affect average daily gain (ADG), feed consumption, or feed conversion ratio (FCR). Rumen pH and molar proportions of propionate were higher (P < 0.01) and acetate proportion was lower in the FL (P < 0.01) than they were in the CTR heifers. Flavonoid supplementation might be effective in improving rumen fermentation and reducing the incidence of rumen acidosis. This effect of flavonoids may be partially explained by increasing the numbers of lactate-consuming microorganisms (e.g., M. elsdenii) in the rumen.
J Balcells; A Aris; A Serrano; A R Seradj; J Crespo; M Devant
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-24
Journal Detail:
Title:  Journal of animal science     Volume:  -     ISSN:  1525-3163     ISO Abbreviation:  -     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-7-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Departament Producció Animal, ETSEA, Alcalde Rovira Roure 191, 25198 Lleida, Spain.
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