Three digestibility and nitrogen balance trials were carried out to estimate nutritive value of Faba bean (Vicia faba minor) and Pea (Pisum sativum) seeds in comparison to soybean meal in sheep. In each trial 3 diets fed 6 Sarda breed wethers using a two replicated 3x3 Latin Square design. The first trial consisted of 2 level of Faba bean: 20% (FB20) and 38% (FB38) as fed ingredient with 13.8% and 17% CP diet content on DM basis, respectively, vs a level of soybean meal (S1: 15.8% CP, DM basis). The second trial consisted in 2 level of Pea seeds: 23% (P23) and 48% (P48) as fed ingredient with 12.6% and 15.2% CP diet content on DM basis, respectively, vs a level of soybean meal (S2: 14.5% CP, DM basis). Medium quality natural meadow hay completed diets of the first and the second trial. In the third trial, animals were fed 3 isonitrogenous (CP % content - FB: 16.2, P: 16.5 and S: 16.4) and isocaloric diets. The diets consisted of good quality alfalfa hay and 3 mixed feeds characterized by the presence of only one of the 3 protein sources to study. Mineral-vitamin premix and different proportions of maize and dehydrated beet pulp supplemented mixed feeds. These 3 diets were formulated to fed lactating ewes in a successive experimental trial to verify their effects on milk production. The high content of Faba bean and Pea seeds, in the first two trials, didn’t show animal palatability problems. In the first trial, the highest organic matter digestibility % (OMD) resulted for FB38 diet (71.3A FB20, 75.8B FB38, 71.2A S1). Crude protein digestibility % (CPD) data showed the highest values in diets with the highest CP content: FB38 and S1 (73.3A FB20, 78.0Bb FB38, 76.8Ba S1); the same two diets showed the highest g/d retained N (7.7a FB20, 9.0b FB38, 9.2b S1). In the second trial, P48 diet showed highest OMD % (69.7A P23, 76.2B P48, 67.5A S2), while no significant differences resulted among diets for CPD % (70.9 P23, 74.7 P48, 74.3 S2) and g/d retained N (2.8 P23, 3.8 P48, 3.8 S2, g/d). In the third trial, CPD % of pea diet showed the highest value (FB: 78.0Aa, P: 80.4B and S: 78.7Ab) but in N balance the same diet showed the lowest retained N value (FB: 4.6, P: 3.4A and S: 5.4B, g/d). Also in OMD % pea diet showed the highest value and FB diet the lowest (FB: 75.7A, P: 77.5Bb and S: 76.7a). In conclusion, in the present study, small differences, significant or not, in digestibility and N balance were observed among diets due to protein sources. Although further studies are necessary, Faba bean and Pea seeds appear to be valid substitutes of soybean meal in sheep considering some known limits to use this feed (OGM, solvent extr.), farm management (self sufficiency) or economic reason (debit balance).
Digestibility and nitrogen balance of diets based on faba bean, pea seeds and soybean meal in sheep
LIPONI, GIAN BATTISTA;CASINI, LUCIA;GATTA, DOMENICO
2009-01-01
Abstract
Three digestibility and nitrogen balance trials were carried out to estimate nutritive value of Faba bean (Vicia faba minor) and Pea (Pisum sativum) seeds in comparison to soybean meal in sheep. In each trial 3 diets fed 6 Sarda breed wethers using a two replicated 3x3 Latin Square design. The first trial consisted of 2 level of Faba bean: 20% (FB20) and 38% (FB38) as fed ingredient with 13.8% and 17% CP diet content on DM basis, respectively, vs a level of soybean meal (S1: 15.8% CP, DM basis). The second trial consisted in 2 level of Pea seeds: 23% (P23) and 48% (P48) as fed ingredient with 12.6% and 15.2% CP diet content on DM basis, respectively, vs a level of soybean meal (S2: 14.5% CP, DM basis). Medium quality natural meadow hay completed diets of the first and the second trial. In the third trial, animals were fed 3 isonitrogenous (CP % content - FB: 16.2, P: 16.5 and S: 16.4) and isocaloric diets. The diets consisted of good quality alfalfa hay and 3 mixed feeds characterized by the presence of only one of the 3 protein sources to study. Mineral-vitamin premix and different proportions of maize and dehydrated beet pulp supplemented mixed feeds. These 3 diets were formulated to fed lactating ewes in a successive experimental trial to verify their effects on milk production. The high content of Faba bean and Pea seeds, in the first two trials, didn’t show animal palatability problems. In the first trial, the highest organic matter digestibility % (OMD) resulted for FB38 diet (71.3A FB20, 75.8B FB38, 71.2A S1). Crude protein digestibility % (CPD) data showed the highest values in diets with the highest CP content: FB38 and S1 (73.3A FB20, 78.0Bb FB38, 76.8Ba S1); the same two diets showed the highest g/d retained N (7.7a FB20, 9.0b FB38, 9.2b S1). In the second trial, P48 diet showed highest OMD % (69.7A P23, 76.2B P48, 67.5A S2), while no significant differences resulted among diets for CPD % (70.9 P23, 74.7 P48, 74.3 S2) and g/d retained N (2.8 P23, 3.8 P48, 3.8 S2, g/d). In the third trial, CPD % of pea diet showed the highest value (FB: 78.0Aa, P: 80.4B and S: 78.7Ab) but in N balance the same diet showed the lowest retained N value (FB: 4.6, P: 3.4A and S: 5.4B, g/d). Also in OMD % pea diet showed the highest value and FB diet the lowest (FB: 75.7A, P: 77.5Bb and S: 76.7a). In conclusion, in the present study, small differences, significant or not, in digestibility and N balance were observed among diets due to protein sources. Although further studies are necessary, Faba bean and Pea seeds appear to be valid substitutes of soybean meal in sheep considering some known limits to use this feed (OGM, solvent extr.), farm management (self sufficiency) or economic reason (debit balance).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
