Evaluation of compressibility characteristics of the forage-concentrate composition to produce complete feed blocks

Document Type : Research Paper

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Abstract

An experiment was conducted to determine the effects of two pressure levels in the hydraulic press (200 and 220 bar) of complete feed blocks (CFBs) manufacturing machine, three levels of the pressure dwell time (5, 17 and 30 seconds) and two levels of forage particle size (10 and 30mm) on compressibility characteristics of CFBs in a completely randomized design with 12 treatments and 10 replications. In each CFB, forage, concentrate and molasses ratio was 45: 45: 10 and forage portion of the diet contains 29 percent of alfalfa hay and 16 percent of wheat straw, based on dry matter. By increasingin the hydraulic press pressure and the pressure dwell time, the density of CFBs were increased. The average of density (Kg/m3) in CFBs containing large forage particles (457.03 ± 4.36)were lower than CFBs containing small forage particles (478.28 ± 4.50, p<0.05). Post compression expansion (PCE) means in CFBs containing large forage particles (2.50 ± 0.22) were higher than in CFBs containing small forage particles (1.56 ± 0.20, p<0.01) in the first 24 hours post production. The most of the PCE and the density reduction of CFBs occurred in the first 24 hours post production (p<0.01). There was a linear relationship between the density (Kg/m3) of CFBs in the time of production and PCEpercent after 24 hours or 100 days of storage (pmm forageparticle size, hydraulic press pressure of 220 bar and pressure dwell time for 5 seconds are the best conditions for the production of alfalfa and wheat straw-based CFBs.

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Animal Sciences Journal
Volume 30, Issue 116
December 2017
Pages 115-126

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