Diet digestibility and performance of dairy cows supplemented with live yeast

Abstract

Dietary yeast supplementation may improve the digestive efficiency of ruminants, but responses depend on the yeast strain and the diet composition. Corn silage and citrus pulp are usual carbohydrate sources for dairy cows in southeast Brazil. This study evaluated the supplementation of dairy cows fedding on corn silagecitrus pulp-based diets with Saccharomyces cerevisiae CNCM I-1077 (Lallemand SAS, Toulouse, France). Twenty multiparous, midlactation Holstein cows were assigned to two treatments in crossover design. Treatments were: live yeast on oyster meal capable of supplying a daily minimum of 1 × 10 10 CFU per cow or oyster meal top-dressed at 10 g to the morning meal. Diet contained (% of dry matter): 16.8% crude protein, 30.9% neutral detergent fiber, 43.9% corn silage, 2% tifton hay, 14.4% steam flaked corn, 16.9% citrus pulp and 21.7% soybean meal. Yeast supplementation increased daily yields of milk (29.4 vs. 28.5 kg, p = 0.11), protein (0.939 vs. 0.908 kg, p = 0.05), and lactose (1.294 vs. 1.241 kg, p = 0.06), but did not affect milk fat contents (p = 0.59). Daily dry matter intake was 21.4 with yeast and 20.7 kg for the control (p = 0.11). Total tract apparent digestibility of the neutral detergent fiber was 48.1% with yeast and 43.2% for the control (p = 0.08). There was a trend for increased intake of digestible organic matter with yeast supplementation (p = 0.07). The positive milk protein yield response to yeast supplementation may have resulted from the increased fiber digestibility, but the response mechanism could not be elucidated. Key words: Saccharomyces cerevisiae, citrus pulp, probiotic Digestibilidade da dieta e desempenho de vacas leiteiras suplementadas com levedura viva RESUMO: A suplementação com levedura pode melhorar a eficiência digestiva de ruminantes. Entretanto, a resposta depende da cepa de levedura e da composição da dieta. Silagem de milho e polpa cítrica são fontes frequentes de carboidratos para vacas leiteiras no Sudeste do Brasil. Avaliou-se a suplementação de vacas leiteiras alimentadas com dieta baseada em silagem de milho e polpa cítrica com Saccharomyces cerevisiae cepa CNCM I-1077 (Lallemand SAS, Toulouse, França). Vinte vacas Holandesas multíparas em meio de lactação foram alocadas a uma seqüência de dois tratamentos em delineamento de reversão simples. Os tratamentos foram: 10 g de levedura viva em farinha de ostra para fornecer um mínimo diário de 1 × 10 10 ufc por vaca ou farinha de ostra fornecidos sobre a refeição matinal. A dieta continha (% da matéria seca): 16,8% de proteína bruta, 30,9% de fibra em detergente neutro, 43,9% de silagem de milho, 2% de feno de tifton, 14,4% de milho floculado, 16,9% de polpa cítrica e 21,7% de farelo de soja. A suplementação com levedura aumentou as produções diárias de leite (29,4 vs. 28,5 kg, p = 0,11), proteína (0,939 vs. 0,908 kg, p = 0,05) e lactose (1,264 vs. 1,241 kg, p = 0,06), e não teve efeito sobre a gordura do leite (p = 0,53). O consumo diário de matéria seca foi 21,4 kg com levedura e 20,7 no controle...

Effects of two yeast based direct fed microbials on performance of high producing dairy cows

“…However, data from our study shows that there was no influence on microbial CP flow (g/d) from the rumen with YST, which is in agreement with Soder and Holden (1999) and Bitencourt et al (2011) who found no effect on the urine creatinine to allantoin ratio when a live yeast product was fed. In contrast, Erasmus et al (1992) showed a tendency to increase non-ammonia N flow from the rumen when diets were supplemented with a live yeast.…”

“…This is similar to our 1.2 kg/d increase in milk yield. However, in contrast to Stretenovic et al (2008), milk fat and lactose composition (g/kg) did not change in our study and this is in agreement with Bitencourt et al (2011) who fed a live yeast. In contrast to our results, Kristensen et al (2014) reported no difference in milk production when a live yeast product was fed to dairy cows, but found that its addition decreased milk protein concentrations, which is also in agreement with a literature review by Robinson (2013) which showed that addition of live yeast decreases milk CP %.…”

Effects of types and doses of yeast on gas production and <i>in vitro</i> digestibility of diets containing maize (<i>Zea mays</i>) and lucerne (<i>Medicago sativa</i>) or oat hay

“…In a few experiments, the colony-forming units (CFUs) were corroborated (Bitencourt et al, 2011;Vyas et al, 2014;Emmanuel et al, 2007). In contrast, data from Arcos-García et al (2000) showed that the CFU value determined in the laboratory differed from that reported on the yeast product packaging.…”

Probiotic yeasts in livestock sector

“…Mousa et al (2012) fed Rahmani lambs yeast containing roughage diets and observed an improvement in digestibility of dry matter (DM), crude protein and fiber. Probiotic yeast supplementation has been evidenced to increase the dry matter as well as digestible organic matter intake and also protein digestion (Miller-Webster et al, 2002;Lesmeister et al, 2004;Mardenet al, 2008;Desnoyers et al, 2009;Bitencourt, 2011). The variability in dry matter intake is due to many factors such as the dose of the probiotic yeast, the strain of the yeast and the nature of the diets fed, especially the different concentrations and contents of the highly fermentable sugars (Cabrera et al, 2000;Lila et al, 2004;Kawas et al, 2007;Pinos-Rodríguez et al, 2008).…”