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Effect of replacing Soya by broad beans on fermentation parameters in the rumen of Sicilo-Sarde rams

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Author(s): Moncef Hammami, | Abderrahmane Ben Gara, | Boulbaba Rekik | Hamadi Rouissi

Journal: Research Opinions in Animal & Veterinary Sciences
ISSN 2221-1896

Volume: 1;
Issue: 3;
Start page: 188;
Date: 2011;
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Keywords: Broad Bean | Protozoa | Protein Source | Ammonia Nitrogen | Methane | Sicilo-Sarde Rams

ABSTRACT
The objective of this work was to study the effects of replacing Soybean meal by broad bean (Vicia faba L.) in the formulation of concentrates on fermentation parameters in the rumen of Sicilo-Sarde rams. Parameters were pH, N-NH3 concentrations, protozoa, total gas and methane productions and in sacco digestibility of oat hay for different protein sources. Four Sicilo-Sarde rams with permanent canulas were used in this trial. Rams (mean age = 4.75±0.5; mean live weight = 53.3±6.6 kg) were kept in individual boxes and received a ration distributed in two meals. The ration included 1.5 kg dry matter of oat hay and 500 g /ram/day of Soybean (S) during one month and there after the broad bean (V) during another one month period. Each of the trial periods was preceded by a two weeks adaptation period. Water was ad libitum. The S concentrate was 82.5% barley, 13.5% Soya, and 4% mineral mixture, while the F concentrate included 71.5% barley, 17.5% Vicia faba, 7% Soya and 4% mineral mixture. The energy and protein contents were 0.54, 0.96 and 0.96 UFV/kg DM and 5.20, 16.8 and 16.2 % for hay, S and V concentrates, respectively. Samples of 50 ml of rumen juice were taken before the morning meal and after 2, 5 and 8 hours to determine pH and ammonia nitrogen concentration. Types and counts of protozoa were determined on unfiltered rumen juice taken 2 hours after the morning meal and kept in a 100 ml fixing mixture. Protozoa types were counted by means of a HAWSKLEY counter. To determine gas production (CO and CH ), rumen content was 2 4 collected in 100 ml plastic syringes before the morning meal and was filtered through four surgical gas layers. Rams were deprived from drinking water during the night before sampling. The DM degradability was determined by in sacco method using nylon bags with 50 micron diameter. Each bag contained 3 g of crushed hay and was incubated in the rumen for 48 hours. The pH of ruminal juice was comparable (P>0.05) for the S and V concentrates. Total counts of protozoa types showed that animals fed the V concentrate had higher protozoa population in the rumen (6.07 vs 5.24×105/ml) than other animals. However, proportions of protozoa types (Entodinium, Isotricha, Ophryoscolex, Polyplastron) were similar for both regimen (P0.05). Total gas production was comparable for the V and S concentrates (mean = 53.5 ml, STD = 6.31 ml and mean = 51.8 ml, STD =11.5 ml, respectively), whereas potential gas production was significantly higher (p
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