Performance and feed efficiency of lactating cows supplemented with live yeast / DESEMPENHO E EFICIÃNCIA ALIMENTAR DE VACAS LEITEIRAS SUPLEMENTADAS COM LEVEDURA VIVA

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Performance and nutrient utilization of dairy cows supplemented with Saccharomyces cerevisiae strain CNCM I-1077 (Lallemand SAS, France) were evaluated. Twenty Holsteins, averaging 143Â49 days in lactation at the beginning of the trial, formed ten blocks based on milk yield and were randomly assigned to a sequence of two treatments, in a cross-over design, with 28-day periods. Measurements were performed on the fourth week of each period. Treatments were: 10 g of the product Natucell (Ouro Fino SaÃde Animal, Brazil) capable of providing 1x1010 cfu of live yeast or the same amount of placebo. Treatments were fed daily by allocation to each cow over the individually fed TMR. Diet composition was (% of DM): Corn silage (43.9), tifton hay (2.0), steam-flaked corn (14.4), pelleted citrus pulp (16.9), and soybean meal (21.7). Diet crude protein content was 16.8%, NDF was 30.9%, and NFC was 41.0% of DM. Data was analyzed with a model containing the effects of block, cow within block, period and treatment. Yeast supplementation increased daily milk (29.4 vs. 28.5 kg, P=0.11), protein (0.919 vs. 0.884 kg, P=0.05) and lactose yields (1.265 vs. 1.212 kg, P=0.06), and had no effect on milk fat (P=0.53). Daily dry matter intake was 21.4 kg with yeast and 20.7 for the control (P=0.11). Total tract apparent digestibility of the NDF was 48.1% with yeast and 43.2% for the control (P=0.08). There was a increased intake of digestible organic matter with yeast supplementation (P=0.07). Rumen fermentation and microbial parameters did not change between treatments. The concentration of purine derivatives in urine was numerically increased by yeast supplementation (P>0.20). The positive performance response to live yeast supplementation may have been the result of better diet digestibility.

ASSUNTO(S)

produÃÃo de leite consumo digestibilidade saccharomyces cerevisiae zootecnia

ACESSO AO ARTIGO

Documentos Relacionados