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Articles by N. Moujahed
Total Records ( 3 ) for N. Moujahed
  T. Najar , N. Moujahed , H. Chazouani and F. Gouhis
  The aim of this study was to study the effect of the partial substitution of soybean with faba bean in fattening concentrate for beef cattle. Fifteen Pie-Noire Holstein breed beef cattle (average age and initial liveweight: 5 months and 170 kg, respectively) were used and divided into 3 equal groups receiving a basal diet composed of oat-vetch hay. Animals were supplemented with 3 types of fattening concentrate composed of barley, wheat barn, corn, minerals and vitamins supplements and including, respectively 0 (D1), 16 (D16) and 23% (D3) of faba bean, substituting partially soybean. The three types of concentrate (C0, C16, C23) are almost iso-energetic and iso-nitrogenous. The trial lasted 6 months and animals were weighted twice a month. Intake was determined at 4 times at equal intervals, among all the experimental period. Chemical composition of feeds and characteristics of their in vitro fermentation using cumulative gas production technique, dry matter intake (DMI), live weight gain (LWG) and feed conversion ratio (FCR) were determined. The obtained results showed no significant differences in in vitro gaz production Parameters, in vitro organic matter digestibility (IVOMD) and metabolisable energy (ME) between C0, C16 and C23. The incorporation of faba bean in the fattening concentrate of beef cattle did not induce a significant variation in daily LWG (averaged 1400 g day 1). The differences in DMI were not significant between the three groups and DMI of hay varied from 3.3-5.5 kg day 1. The same trend was noted for FCR (averaged 5.5). It was concluded that substituting soybean with faba bean until a rate of 23% of fattening concentrate allowed the obtaining of the same performances as the conventional concentrate based on soybean representing the main protein source. The economical interest of this substitution may depend on the comparative cost of faba bean.
  N. Moujahed , A. Moujahed-Raach , M. Jlali , T. Najar and Ch. Kayouly
  Four Barbarine breed sheep (initial average BW and age 58 kg and 18 month, respectively), receiving a basal diet composed of oat hay, were used in a Latin square design (44) to study the effect of the total substitution of soybean meal (D1: Sb: 23.5% of concentrate) by corn distillers dried grains with soluble (D2: DDGS: 45%) or corn gluten feed (D3: CGF: 65%) or a mixture of the 2 ingredients (D4: CGF+DDGS, respectively 23 and 26%) on intake, digestibility and nitrogen balance. The proportion of concentrate in diet was adjusted at a level of 25% of the total dry matter intake. Each experimental period lasted 28 days (21 and 7 days, respectively for adaptation and measurements). The compound feeds were approximatively iso-nitrogenous and iso-energetic. The obtained results showed that the studied corn co-products were characterized by a high quality of crude protein. The voluntary intake of hay and total diet DM were not affected by the applied substitution (average value 53.2 g DMkg-0.75 day-1). No effect of substitution was noted on DM, OM and CP digestibility or N balance. In contrast, an improvement of the digestibility of crude fiber was observed (p<0.05), mainly in diet containing DDGS. The biological quality of N expressed as the ratio: Retained N/Absorbed N, seamed to be higher in SBM, DDGS and GDDS diets (averaged 30.5%) than in CGF one (26.6%). It was concluded that substituting soybean with corn co-products in concentrate supplied at a rate of 25% of DM total intake did not affect nutritive value of oat hay based ration and the studied diets were nutritionally similar.
  N. Moujahed , I. Dabboussi , S. Bel Haj Ammar and S. Darej
  The current study aimed to compare 3 strategies of distribution of concentre in 84 Holstein breed dairy cows divided into 3 equal groups (average initial liveweight: 553 kg, average stage of lactation: 122 days, row of lactation: 8 cows at the first and 20 at the second lactation in each group) on intake and milk yield and composition. They received a basal diet composed of oat hay, corn or grass silage and green ryegrass. The concentrate was distributed either in Total Mixed Ration (TMR) or Partially Mixed Ration (PMR) or Separate Ration (SR). Intake (3 times during the experiment) and individual dairy production (twice a month) were measured among a 13-weeks experimental period. Also, milk composition (protein and fat) were analysed in milk samples taken in every control. The trial lasted 13 weeks, preceded by 3 weeks of adaptation. Results indicated that Dry Matter (DM) intake of concentrate was significantly, but slightly (p<0.05) higher in SR than in PMR and in TMR (11.5, 11.3 and 11 kg). The same trend was almost observed in total diet DM intake. Animals from the group PMR produced significantly (p<0.05) more milk (31.4 kg day-1) than the tow other groups which were similar (averaged: 26.5 kg day-1). Milk from SR group was slightly higher (p<0.05) in protein than PMR and TMR, which were similar (31.3, 30.2 and 29.9 g kg-1, respectively). No significant differences were observed in fat (mean average: 32 g kg-1). It was mainly concluded that with the current low-quality based diet, the mixed strategy (PMR) seamed to result in the highest milk production with no considerable effects on milk fat and protein content.
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