Volume 3, Issue 6 (3-2013)                   rap 2013, 3(6): 64-79 | Back to browse issues page

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Aghajani V, Teimouri Yansari A. The Effect of Alfalfa Particle Size and Soybean Oil Supplementation on Digestibility, Chewing Activity, Ruminal Passage Rate and Digesta Distribution in Sheep. rap. 2013; 3 (6) :64-79
URL: http://rap.sanru.ac.ir/article-1-123-en.html
Sari Agricultural Sciences and Natural Resources University
Abstract:   (3807 Views)

     Four 2 years fistulated Zel sheep (BW = 28±2 kg) were used in a 4×4 chang over design in four 32 d (adaptation 14 d and sampling period 18 days) in order to evaluate the effects of alfalfa particle size (fine or long) and soybean oil (0 or 4%) on nutrients digestibility, chewing activity, passage rate and ruminal particle size distribution. Sheep were equally fed at maintenance level, twice daily at 8 A.M. and 20 P.M. with 4 TMR that contained forage to concentrate ratio of 40 to 60. Manually ruminal evacuation carried out at 3, 7.5, 12 h post-feeding and total ruminal contents were separated into solid and liquid phases. In each period, using Cr-mordanated NDF, the ruminal passage rate of ruminal digesta particulate was determined. The treatments had no effect on apparent digestibility of DM, OM, nutrients, eating and rumination time and total chewing activity. The treatment containing long alfalfa without oil supplement showed the lowest ruminal passage rates and the highest ruminal mean retention time. However, there were not significant differences between ruminal passage rate and retention time in the other three treatments. Reduction of alfalfa particle size and supplementation of soybean oil in treatment that contained large particle ruminal passage rate and retention time increased and decreased, respectively. At 3 h after feeding, the ruminal inescapable DM, as well as the escapable ones, were not significantly affected by treatments. The ruminal inescapable DM increased 11.44% and the ruminal escapable DM decreased 11.63% by reducing roughage particle size and soybean oil supplementation at 7.5 h post-feeding. The ruminal unescapably DM increased, at 12 h post-feeding, due to forage particle size reduction and soybean oil supplementation. The particle size reduction was expected to decrease the consistency of mat, chewing activities, but the supplementation of soybean oil had adjusted the effects of particle size that ultimately the similar results have obtained. The reduction of alfalfa hay particle size as well as soy bean oil supplementation in rations helped to achieve appropriate ruminal particle distribution or formation of consistent ruminal mat.
 
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Type of Study: Research | Subject: Special
Received: 2013/04/7 | Revised: 2019/02/20 | Accepted: 2013/04/10 | Published: 2013/04/10

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