CASE STUDY: Multiple-Study Analysis of the Effect of Live Yeast on Milk Yield, Milk Component Content and Yield, and Feed Efficiency

Use of Yeast Probiotics in Ruminants: Effects and Mechanisms of Action on Rumen pH, Fibre Degradation, and Microbiota According to the Diet

“…The effect of yeast probiotics on DM intake shows either no effect [73] or a significant increase in DMI [58]. Live yeast supplementation seems to have an effect on intake pattern rather than on intake per se [56].…”

“…A meta-analysis conducted on all types of yeast (including live yeast and yeast culture) and all types of dairy ruminants (cows, goats, ewes) [58] concluded that the addition of yeast improved milk yield by 1.2 g/kg body weight. In their multi-analysis reporting data collected from 14 dairy cow trials fed the same live yeast strain, De Ondarza et al [73] found that live yeast improved (P < 0.0001) milk yield by 1.15 kg/day. The effect was slightly greater for cows in early lactation (<100 Days In Milk, DIM) than for cows >100 DIM, suggesting that animal performance is improved when the acidosis risk is high, notably at critical periods of the lactation cycle.…”

Levadura viva (Saccharomyces cerevisiae) en la degradabilidad in vitro de una dieta para bovinos basada en forraje más concentrado

“…Una de esas alternativas, para minimizar el impacto ruminal de las dietas que contienen granos, es el uso de levaduras vivas ya que tienen muchas ventajas (Evans et al, 2012), mismas que además de contribuir a mejorar la eficiencia alimenticia (White et al, 2008;Holtshausen y Beauchemin, 2010;Ondarza et al, 2010a), producción y contenido de proteina en leche (Shaver y Garrett, 1997;Ondarza et al, 2010b), ganancia diaria de peso (Ponce et al, 2012), incremento de las poblaciones de microorganismos totales del rumen (Fokkink et al, 2009) y en muchos casos el incremento en la digestibilidad de los forrajes (Bacha, 2002), aunque en otros no presentan efecto (Hinman et al, 1998;O'Connor et al, 2002). Los betaglucanos presentes en la pared externa de las levaduras estimula el sistema de defensa natural del organismo; además de estimular de forma selectiva el crecimiento de las poblaciones de bacterias consumidoras de lactato (Megaspharera elsdenii y Selenomonas ruminantium) lo que reduce la presencia de ácido láctico, evitando así las caídas pronunciadas de pH ruminal, lo que disminuye la incidencia de acidosis y por lo tanto los problemas digestivos, las cojeras y los altos conteos de células somáticas asociadas a esta causa (Clayton et al, 1999;Bacha, 2002).…”

Nutritional strategies to control ruminal acidosis in feedlot cattle

“…cerevisiae has been shown to influence positively dairy cattle production, as reviewed by De Ondarza et al (2010). These authors reviewed 14 experiments with dairy cattle and reported that fat-corrected milk production was increased on average by 3.5% (P<0.01) in dairy cows supplemented with S. cerevisiae, with significant improvements in feed efficiency (1.75 vs. 1.70 kg/kg for live yeast and control, respectively; P<0.01), milk fat yield (1.28 vs. 1.25 kg/d; P<0.01) and milk true protein yield (1.02 vs. 1.00 kg/d; P<0.001); without any effect on DMI.…”

“…Yeast cultures of Saccharomyces cerevisiae have also been reported to stimulate lactate utilization by S. ruminantium and M. elsdenii , and could contribute to increase rumen pH (Chaucheyras-Durand et al, 2012). As previously reviewed (Desnoyers et al, 2009;De Ondarza et al, 2010), S. ruminantium supplementation to dairy cattle increases in milk production, but studies on beef cattle are scarce and controversial. Inconsistences in the response to malate and S. ruminantium supplementation may be explained by variations in the dose, growth rate and age of the animal, diet composition and farming conditions, among other factors (Yoon and Stern, 1995;Carro and Ungerfeld, 2015).…”