Effect of combining fibrous feeds on the digestibility of complete pelleted diets for lambs – The objective of this paper was to evaluate the effect of combining lucerne hay, wheat straw and soybean stover on the apparent digestibility of nine complete pellet diets. The trial was carried out on twenty-seven Appennine lambs, fifty days old, divided into nine groups of three subjects each. Each group was fed one of the nine experimental diets. The diets were composed, on dry basis, of 40% concentrate and 60% lucerne hay (M) or wheat straw (F) or soybean stover (O), three simple diets, or the combination of two fibrous feeds (30+30%, three binary diets: MF, MO and FO) or the combination of three fibrous feeds (30+15+15%, three ternary diets: MM FF OO). Ten days of feeding adaptation precede experimental time. The acid insoluble ash method was used for determining apparent digestibility. Univariate analysis of variance, using two monofactorial models, and Principal Component Analysis with correlation matrix were carried out on collected data. It appears that the combination of lucerne hay with fibrous by-products did not influence the OM and GE digestibility, that were about additive. However a negative effect of soybean stover on digestibility of MO and FO diets was observed. This effect was non observed on ternary diets. The same behaviour was observed about CP digestibility, but only in the MM ternary diet was the negative soybean stover effects neutralized. As regards the CF digestibility, by-products showed a negative effect chiefly on lucerne and to lesser degree on themselves. This trend occurred on binary and ternary combinations. The Principal Component Analysis allowed the observed phenomenon with four latent variables to be described: total variance explained by analysis was 94%. The first factor (variance explained 58%) explained the totality of the digestibility of the diets (OM, GE, NFE, CF, NDF, ADF, cellulose and hemicelluloses) and variables influencing them. ADL content, an important factor influencing digestibility, showed a low correlation coefficient value probably due to the legume-grasses combination. The other three factors (variance explained 36%) described the effects of combining fibrous feeds on CF, NDF, ADF and hemicelluloses digestibility. Especially the composition of factors 2 and 3 showed, respectively, the negative influence of ADL content of diets on ADF digestibility and the inhibiting effect of NFE digestibility on feeding fibre digestibility. Probably, this last effect was due to the presence of a high quantity of fermentable carbohydrates or to a too small diameter of the pellets.

EFFETTO DELL'ASSOCIAZIONE DI ALIMENTI FIBROSI SULLA DIGERIBILITÀ DI DIETE COMPLETE PELLETTATE PER AGNELLI

DE VINCENZI, Sergio
1994

Abstract

Effect of combining fibrous feeds on the digestibility of complete pelleted diets for lambs – The objective of this paper was to evaluate the effect of combining lucerne hay, wheat straw and soybean stover on the apparent digestibility of nine complete pellet diets. The trial was carried out on twenty-seven Appennine lambs, fifty days old, divided into nine groups of three subjects each. Each group was fed one of the nine experimental diets. The diets were composed, on dry basis, of 40% concentrate and 60% lucerne hay (M) or wheat straw (F) or soybean stover (O), three simple diets, or the combination of two fibrous feeds (30+30%, three binary diets: MF, MO and FO) or the combination of three fibrous feeds (30+15+15%, three ternary diets: MM FF OO). Ten days of feeding adaptation precede experimental time. The acid insoluble ash method was used for determining apparent digestibility. Univariate analysis of variance, using two monofactorial models, and Principal Component Analysis with correlation matrix were carried out on collected data. It appears that the combination of lucerne hay with fibrous by-products did not influence the OM and GE digestibility, that were about additive. However a negative effect of soybean stover on digestibility of MO and FO diets was observed. This effect was non observed on ternary diets. The same behaviour was observed about CP digestibility, but only in the MM ternary diet was the negative soybean stover effects neutralized. As regards the CF digestibility, by-products showed a negative effect chiefly on lucerne and to lesser degree on themselves. This trend occurred on binary and ternary combinations. The Principal Component Analysis allowed the observed phenomenon with four latent variables to be described: total variance explained by analysis was 94%. The first factor (variance explained 58%) explained the totality of the digestibility of the diets (OM, GE, NFE, CF, NDF, ADF, cellulose and hemicelluloses) and variables influencing them. ADL content, an important factor influencing digestibility, showed a low correlation coefficient value probably due to the legume-grasses combination. The other three factors (variance explained 36%) described the effects of combining fibrous feeds on CF, NDF, ADF and hemicelluloses digestibility. Especially the composition of factors 2 and 3 showed, respectively, the negative influence of ADL content of diets on ADF digestibility and the inhibiting effect of NFE digestibility on feeding fibre digestibility. Probably, this last effect was due to the presence of a high quantity of fermentable carbohydrates or to a too small diameter of the pellets.
1994
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/921241
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