Nutritive value of sun-dried grape pomace, incorporated at a low level in complete feed for the rabbit bred under Magrebian conditions

Abstract

ABSTRACT:The nutritive value and potential use of sun-dried grape pomace (g/kg as fed: 140 of crude protein (CP), 529 of neutral detergent fi bre (NDF), 460 acid detergent fi bre, 293 acid detergent lignin) for fattening rabbits was studied by comparing 3 experimental diets containing a low but increasing incorporation rate of grape pomace (GP): 0% (control, GP0), 3% (GP3), and 6% (GP6) in substitution to the control diet (251 g NDF and 175 g CP/kg) formulated with raw materials available in the area of Tiaret (Algeria): barley, wheat bran and straw, soybean meal and faba bean. Three groups of 30 rabbits (individually caged) were fed ad libitum the three diets from weaning (35 d, mean weight 460±83 g) to 77 d of age. The dry matter digestibility was obtained from total and individual faecal collection on all animals (3 x 30), during four consecutive days each week from 42 to 77 d of age. Then, faeces from 10 rabbits per group were selected for nutrient analyses. Intake and weight gain were recorded twice a week during the whole fattening period. Incorporating 3 or 6% of GP in a low fi bre diet impaired from 35 to 77 d growth rate P<0.01), feed conversion (+8.5% for GP6 vs. GP0, P<0.01), and dressing out percentage (-2.5% for GP3 and GP6 vs. GP0, P<0.001). The digestibility of organic matter was linearly reduced from 72.8 to 70.0% with the GP incorporation rate (P<0.01), while crude protein digestibility remained unaffected and averaged 78.7%. The predicted nutritive value of sun-dried GP calculated by regression was high but highly variable for digestible energy (9.33±2.01 MJ DE/Kg, raw basis), and particularly for the digestible protein content (81.8±77.2 g DCP/kg). Thus, the sun-dried whole grape pomace could be considered as an alternative fi bre source for the rabbit feeding in Magrebian area.

Nutritive Value of Sun-Dried Sulla (Hedysarum Flexuosum) and Its Effect on Performance and Carcass Characteristics of Growing Rabbits

“…They were about 25% higher than those generally obtained with rabbits of the coloured local population (28 g/d) (Berchiche and Kadi, 2002;Lakabi et al, 2008;Guemour et al, 2010).…”

“…Since average daily weight gain is high (37 g/d), the average slaughter body weight (Table 4) obtained at 84 d (2407 g) was about 20% higher than that generally obtained with rabbits of the local coloured population at the same age (Berchiche et al, 2000;Lakabi et al, 2008;Guemour et al, 2010). The incorporation of sulla hay did not impair the slaughter traits.…”

Bilberry pomace in rabbit nutrition: effects on growth performance, apparent digestibility, caecal traits, bacterial community and antioxidant status

“…Our product presented a moderate energetic value than other by-products as GP (5.0 and 9.3 MJ/kg DM), dried beet pulp (10.3 MJ/kg DM) and dried citrus pulp (11.2 MJ/kg DM) (INRA, 2004;Martens et al, 2002, Guemour et al, 2010, since its protein, ADF and ADL contents were respectively higher and lower than the above mentioned by-products. Moreover, using a low incorporation level in the feed probably avoid any major anti-nutritional effect from tannins or other components.…”

Influence of Temperature and Drying Time on Extraction Yield of Phenolic Compounds from Grape Pomace Variety “Portogizac”

“…Grape pomace has so far been investigated as a fertilizer or soil conditioner [10][11][12][13] , as biomass for biofuel production [14][15][16] and as animal feed [17][18][19][20] . Wet grape pomace is a highly perishable material subject to uncontrolled microbial spoilage owing to its high moisture content (~60 % wb ) and water activity.…”