Desempenho produtivo de vacas leiteiras alimentadas com silagem pré-seca de alfafa adicionada de inoculante microbiano

Magalhães, Vanessa Jaime de Almeida; Rodrigues, Paulo Henrique Mazza

doi:10.1590/s1516-35982003000800027

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…Neste sentido, a utilização de inoculantes microbianos (HARRISON;BLAUWIEKEL;STOKES, 1994) é uma técnica extensamente difundida em países desenvolvidos e vem despertando grande interesse dos produtores brasileiros. Entretanto, os resultados obtidos com sua utilização são contraditórios, uma vez que as melhoras no perfil fermentativo das silagens nem sempre são acompanhadas de melhoras na composição química e/ou ganhos no desempenho animal, sendo que o inverso também é verdadeiro (MAGALHÃES;RODRIGUES, 2003).…”

Section: Introductionunclassified

Uso de inoculante bacteriano e melaço na ensilagem de capim-Elefante

Bernardes¹,

Souza²,

Silva³

et al. 2013

RCA

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Os experimentos foram conduzidos para se estudar o efeito da inclusão, em doses, das bactérias homoláticas Lactobacillus plantarum MA18/5U e Pediococcus acidilactici MA 18/5M, associadas ou não ao melaço, em silagens de capim-elefante (Pennisetum purpureum Schum cv. Roxo). Dois experimentos foram realizados utilizando-se silos experimentais de 15L e quatro repetições em cada tratamento, nos quais foram utilizados os procedimentos da análise de variância no primeiro experimento e, por contraste ortogonal, no segundo. O experimento 1 (E1) consistiu na ausência do inoculante bacteriano ou com aplicação de 5 × 10 4 , 1 × 10 5 , 5 × 10 5 ou 1 × 10 6 ufc/g forragem. O experimento 2 (E2) consistiu em silagens sem melaço e inoculante, com a aplicação de 1 × 10 5 ufc/g do inoculante com ou sem 5% de melaço e outra inoculação com 1 × 10 6 ufc/g com ou sem 5% de melaço. Não houve diferença significativa na composição química das silagens, na contagem de fungos e nas perdas de matéria seca, mas houve diferença na contagem de leveduras no momento de abertura em ambos os experimentos. No E1, os tratamentos com maior dosagem do inoculante foram os mais estáveis quando as silagens foram expostas ao ar. No E2, as silagens com melaço e o tratamento que recebeu a maior dosagem também apresentaram maior estabilidade em aerobiose. A utilização do inoculante contendo L. plantarum MA18/5U e P. acidilactici MA 18/5M pode ser recomendável em altas concentrações, inclusive associado com melaço, pois melhorou a estabilidade aeróbia; entretanto, em termos de perfil fermentativo e composição química, seus efeitos não foram demonstrados.

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Section: Introductionunclassified

Uso de inoculante bacteriano e melaço na ensilagem de capim-Elefante

Bernardes¹,

Souza²,

Silva³

et al. 2013

RCA

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Short communication: Prediction of intake in dairy cows under tropical conditions

Souza

Oliveira

Araújo

et al. 2014

Journal of Dairy Science

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A meta-analysis was conducted to develop a model for predicting dry matter intake (DMI) in dairy cows under the tropical conditions of Brazil and to assess its adequacy compared with 5 currently available DMI prediction models: Agricultural and Food Research Council (AFRC); National Research Council (NRC); Cornell Net Carbohydrate and Protein System (CNCPS; version 6); and 2 other Brazilian models. The data set was created using 457 observations (n=1,655 cows) from 100 studies, and it was randomly divided into 2 subsets for statistical analysis. The first subset was used to develop a DMI prediction equation (60 studies; 309 treatment means) and the second subset was used to assess the adequacy of DMI predictive models (40 studies; 148 treatment means). The DMI prediction model proposed in the current study was developed using a nonlinear mixed model analysis after reparameterizing the NRC equation but including study as a random effect in the model. Body weight (mean = 540 ± 57.6 kg), 4% fat-corrected milk (mean = 21.3 ± 7.7 kg/d), and days in milk (mean = 110 ± 62 d) were used as independent variables in the model. The adequacy of the DMI prediction models was evaluated based on coefficient of determination, mean square prediction error (MSPE), root MSPE (RMSPE), and concordance correlation coefficient (CCC). The observed DMI obtained from the data set used to evaluate the prediction models averaged 17.6 ± 3.2 kg/d. The following model was proposed: DMI (kg/d) = [0.4762 (± 0.0358) × 4% fat-corrected milk + 0.07219 (± 0.00605) × body weight(0.75)] × (1 - e(-0.03202 (± 0.00615) × [days in milk + 24.9576 (± 5.909)])). This model explained 93.0% of the variation in DMI, predicting it with the lowest mean bias (0.11 kg/d) and RMSPE (4.9% of the observed DMI) and the highest precision [correlation coefficient estimate (ρ) = 0.97] and accuracy [bias correction factor (Cb)=0.99]. The NRC model prediction equation explained 92.0% of the variation in DMI and had the second lowest mean bias (0.42 kg/d) and RMSPE (5.8% of the observed DMI), as well as the second highest precision (ρ = 0.94) and accuracy (Cb = 0.98). The CNCPS and AFRC DMI prediction models explained 93.0 and 85.0% of the variation in DMI but underpredicted DMI by 1.8 and 1.4 kg/d, respectively. These 2 models (CNCPS and AFRC) resulted, respectively, in RMSPE of 11.3 and 10.7% of the observed DMI, with moderate to high precision (ρ = 0.81 and 0.82) and accuracy (Cb = 0.84 and 0.89). The remaining 2 models resulted in the poorest results, underpredicting DMI by 2.3 and 1.9 kg/d, with RMSPE of 22.8 and 14.9% of the observed DMI and moderate to low precision (ρ = 0.49 and 0.76) and accuracy (Cb = 0.81 and 0.86). The new model derived from the current meta-analytical approach provided the best accuracy and precision for predicting DMI in lactating dairy cows under Brazilian conditions.

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Effects of lactic acid bacteria with bacteriocinogenic potential on the fermentation profile and chemical composition of alfalfa silage in tropical conditions

Silva

Pereira

Leandro

et al. 2016

Journal of Dairy Science

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The fermentation profile, chemical composition, and microbial populations of alfalfa silages treated with microbial inoculants (MI) at different fermentation periods (T) were evaluated in tropical conditions. A 4×6 factorial arrangement was used in a randomized design with 3 replicates. Fresh alfalfa was treated with (1) no treatment (CTRL), (2) commercial inoculant (CIN), (3) Pediococcus acidilactici (strain 10.6, S1), and (4) Pediococcus pentosaceus (strain 6.16, S2). An inoculant application rate of 10(6) cfu/g of fresh forage was used. The fermentation periods were 1, 3, 7, 14, 28, and 56 d. Alfalfa was harvested 82 d after sowing at the early flowering stage, chopped into 1.5-cm particle size, and ensiled in 25 × 35 cm vacuum-sealed plastic bags. The numbers of lactic acid bacteria, enterobacteria, mold, and yeast in alfalfa before ensiling were 5.42, 5.58, 4.82, and 4.8 log cfu/g, respectively. Silage chemical composition was evaluated only at 56 d. All parameters were affected by the interaction MI × T, except the concentrations of lactic and propionic acids. Alfalfa silage treated with S1 or S2 had lower pH values than CTRL from the first day until 28 d. However, the inoculants resulted in similar pH after 56 d, and these values were lower than the CTRL. The highest concentration of lactic acid was observed in the silage treated with S1 and S2 at 7 and 14 d of ensiling. The concentration of acetic acid was lower in the silages treated with S1 and S2 than the CTRL and CIN at 3 and 28 d of fermentation. There was no effect of MI or MI × T interaction on the microbial populations. However, the number of enterobacteria decreased over the fermentation period until 14 d and increased slightly after this time point. The chemical composition of alfalfa silage was not affected by MI at 56 d of ensiling. The strain P. pentosaceus 6.16 was the most efficient in dominating the fermentation process by decreasing the pH more quickly and increasing the concentration of lactic acid, suggesting its potential use as a silage inoculant.

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Desempenho produtivo de vacas leiteiras alimentadas com silagem pré-seca de alfafa adicionada de inoculante microbiano

Cited by 3 publications

References 23 publications

Uso de inoculante bacteriano e melaço na ensilagem de capim-Elefante

Uso de inoculante bacteriano e melaço na ensilagem de capim-Elefante

Short communication: Prediction of intake in dairy cows under tropical conditions

Effects of lactic acid bacteria with bacteriocinogenic potential on the fermentation profile and chemical composition of alfalfa silage in tropical conditions

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