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Zootecnia Tropical
versión impresa ISSN 0798-7269
Resumen
RIVAS, José et al. Effect of supplementation with Saccharomyces cerevisiae on reproductive performance on dairy herds in the mountain area of Mérida state. Zootecnia Trop. [online]. 2006, vol.24, n.3, pp.379-391. ISSN 0798-7269.
The aim of this study was to determine the strategic use of Saccharomyces cerevisiae (SC) from onset of lactation until 105 days postpartum and its effect on reproductive performance, on Holstein (H) and Carora (C) cows located in the mountain area of Merida state, Venezuela. Forty one H and 15 C cows were assigned to two treatments 1) experimental group (EG) fed with 10 g/day of SC, and 2) Control group (CG) that did not receive SC. C cows grazed pastures of Panicum maximum while H cows had access to pastures of Pennisetum clandestinum. All of the cows were fed at milking with a concentrate mixture (20% CP and 58% NDT) at a ratio of 1 kg:3 kg of milk. Reproductive traits such as interval calving-first corpus luteum (IP1CL), interval calving to first estrus (IP1E) and interval calving to conception (IPC) were evaluated. Data were analyzed by ANOVA and mean comparisons tested for significance using Tukey´s procedures. There were not statistical differences (P>0.05) among the reproductive variables between treatments and for the C cows. However, H cows of EG had shorter IP1CL compared to CG cows (28.2 vs 33.7 d). Moreover, 100% of the cows of the EG had their first CL prior to 70 days post calving. Similarly, 59.1% and 75% of the treated H and C cows, respectively, did show behavioral estrus before 70 days after parturition. Results from this study indicated that the strategic use of SC during the first 105 days post calving improved reproductive performance in dairy cows, perhaps by stimulating the action of SC in the rumen and the availability of nutrients in the mammary gland.
Palabras clave : dairy cows; yeast culture; performance reproductive; corpus luteum.