Abstract
ABSTRACT This study aimed to evaluate the productive performance, dry matter intake, apparent digestibility and ingestive behavior of feedlot calves fed corn silage from the feed out face of trench silos with different types of sealing. The animals were divided into three treatments with four repetitions: Conventional seal - double-sided polyethylene of 110µm thickness; Double-sided seal - double-sided polyethylene of 200µm thickness; and Double seal - composed of double face polyethylene with a thickness of 80µm superimposed on a polyamide translucent vacuum film with a thickness of 20µm. The use of double face sealing provided 12.63% increase in average daily gain and improved food conversion by 0.62 percentage points. The apparent digestibility of the diet with double-face sealing system silage was 4.30% higher than the diet with double-face sealing silage and 11.00% higher than the diet with conventional sealing silage. It is recommended to use the double face sealing with 200µm polyethylene and double face sealing with 80µm thick polyethylene on top of a 20µm thick polyamide translucent vacuum film.
Highlights
The type of sealing used in corn silage production has a great importance for an adequate fermentation, which is carried out by lactic acid bacteria that convert soluble sugars into organic acids, such as lactic acid, underIn general, sealing must be uniform throughout the silo, but there is greater difficulty in compacting and correctly sealing the lateral and feed out faces of the trench silo, making them more prone to deterioration, due to greater exposure to the external environment and temperature fluctuations, making the environment conducive to the action of aerobic microorganisms that promote spoilage of ensiled forage (Kung Junior, 2005; Bernardes, 2016)
This study aimed to evaluate the productive performance, dry matter intake, apparent digestibility and ingestive behavior of feedlot calves fed corn silage from the feed out face of trench silos with different types of sealing
The animals were divided into three treatments with four repetitions: Conventional seal double-sided polyethylene of 110μm thickness; Double-sided seal - double-sided polyethylene of 200μm thickness; and Double seal - composed of double face polyethylene with a thickness of 80μm superimposed on a polyamide translucent vacuum film with a thickness of 20μm
Summary
The type of sealing used in corn silage production has a great importance for an adequate fermentation, which is carried out by lactic acid bacteria that convert soluble sugars into organic acids, such as lactic acid, underIn general, sealing must be uniform throughout the silo, but there is greater difficulty in compacting and correctly sealing the lateral and feed out faces (ramp) of the trench silo, making them more prone to deterioration, due to greater exposure to the external environment and temperature fluctuations, making the environment conducive to the action of aerobic microorganisms that promote spoilage of ensiled forage (Kung Junior, 2005; Bernardes, 2016). The demand for cover that maintain an anaerobic environment and with less temperature fluctuation inside the silo has stimulated the development of plastic films with less permeability to oxygen and UV rays and greater mechanical resistance, which allows the efficient preservation of the ensiled mass and reduces nutrient losses during fermentation (Borreani et al, 2007). Based on this purpose, the present study aimed to evaluate the productive performance, dry matter intake, apparent digestibility and ingestive behavior of feedlot steers fed corn silage from the feed out face of trench silos preserved using different types of sealing
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