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The effects of Lactobacillus buchneri and 1-propanol on the nutritive value of corn silage for dairy cows

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Janielen da Silva
Total Authors: 1
Document type: Master's Dissertation
Press: Piracicaba.
Institution: Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC)
Defense date:
Examining board members:
Luiz Gustavo Nussio; João Luiz Pratti Daniel; Maity Zopollatto
Advisor: Luiz Gustavo Nussio

L. buchneri is a heterolactic microorganism capable of producing significant amounts of acetic acid that has antifungal action and usually increase the aerobic stability of silage. In addition, silages inoculated with L. buchneri typically exhibit higher levels of 1-propanol. There is a clame that 1-propanol is associated with decreased dry matter intake (DMI). Thus, the objective of this work was to evaluate the effects of inoculating L. buchneri at corn ensiling and supplementing total mixed rations (TMR) with 1-propanol on the performance of lactating dairy cows. The experiment was conducted in the Department of Animal Science, College of Agriculture \"Luiz de Queiroz\" (ESALQ / USP). Corn crop was harvested at 35% DM and ensiled in farm scale bags (40 t/bag). At ensiling, treatments were: control (C) and L. buchneri 1 × 105 cfu/g (LB). After 247 d of storage, silos were opened and the lactation trial was carried out. Twenty Holstein cows housed in a Tie-stall barn were assigned to a replicated 3 × 3 Latin square design, with 21 d periods (14 d adaptation). Diets contained (DM basis): 8% whole cottonseed, 9.5% citrus pulp, 18% soybean meal, 9% dry ground corn, 2.5% premix mineral + vitamins, and 53% corn silage C or LB or corn silage C + 1% of 1-propanol (PROP). The 1-propanol was diluted in water (1:1) and sprayed onto the TMR during mixing, immediately before each feeding. Silage fermentation and chemical composition were evaluatedin each period, as well as the aerobic stability. Fractional disappearance rates of ethanol, acetic acid and 1-propanol were determined in TMR during feedbunk exposure. The DMI, milk yield and composition, total tract digestibility, ingestive behavior and particle sorting index were recorded from d-15 to d-21 in each period.. In addition, rumen fluid and blood were sampled to determine the concentrations of VFA and 1-propanool, and glucose and non-esterified fatty acids (NEFA), respectively. Analysis of variance was performed using the Mixed procedure of SAS and treatment means were compared by Tukey-Kramer test (α = 0.05). Silage fermentability and aerobic stability were similar between treatments. The DMI, milk yield and milk composition did not differ among treatments. However, the organic matter digestibility was lower for the treatment LB. Animals fed 1-propanol had higher ruminal concentration of this alcohol, higher blood glucose and lower blood NEFA. Inoculation of silage with L. buchneri at 1 × 105 cfu/g does not alter fermentation and is not sufficient to improve the aerobic stability of corn silages. The inoculation of silages with L. buchneri at 1 × 105 cfu/g and the supplementation of TMR with 1-propanol do not alter the performance of dairy cows. (AU)

FAPESP's process: 13/16132-3 - The effects of Lactobacillus buchneri and 1-propanol on the nutritive value of corn silage for dairy cows
Grantee:Janielen da Silva
Support Opportunities: Scholarships in Brazil - Master