Ciencias Agropecuarias

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Author: search.filters.author.Minda Costa, María Belén

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    Efecto del consumo de dietas a base de Artocarpus altilis y Theobroma cacao sobre la degradación ruminal de los nutrientes en bovinos
    (2017) Minda Costa, María Belén; Barros Rodríguez, Marcos
    An alternative for the reduction of production costs is the use of agricultural by-products or products that partially replace the grains and that provide the basic nutrients to meet the demands of productivity. The objective of this study is to determine the effect of the consumption of Artocarpus altilis and Theobroma cacao on ruminal in situ degradation and ruminal function in vitro. Six bulls, with a rumen fistula (Bar Diamond, Parma, Idaho, USA) of approximately 2 years of age with a mean weight of 350 kg, kept in zinc roof pens, cement floors, with a history of grass, and hay consumption. The animals were randomly assigned according to each treatment: T1: 0% inclusion of Artocarpus altilis and Theobroma cacao. T2; 15% inclusion of Theobroma cacao. T3: 15% inclusion of Artocarpus altilis. Differences were observed in the parameters of in vitro gas production when evaluating the effect of ruminal fluids (inocula: LD1, LD2 and LD3 ruminant liquids from animals consuming three types of diets D1, D2 and D3) and diets (D1; (P <0.0001) accumulated production of gas ml / 0.5g fermentable MS (GV) in all the incubated diets in ruminal fluid LD2. In the parameters of degradation of MS and MO in situ there is a difference between the degradation between diets (D1, D2 and D3, MS P = 0.0027, P = 0.0027, P = 0.0045 and MO, P = 0.0367, P = 0.0173, P = 0.0249, respectively), where an effect was obtained in the comparison (Diet 1 x Diet 2) and (Diet 1 x Diet 2 x Diet 3). In vitro digestibility was observed between ruminal fluids and the in vitro digestibility of OM and DM of the incubated diets (P = 0.0001 and P = 0.0041 respectively), as well as the effect of diets (P = 0.0082 and P = 0.0131 respectively). Obtaining the highest digestibility of the diets incubated in the ruminales liquids of the bulls fed diets D1 and D3 (LD1 and LD3). In terms of Ammonia, Volatile Fatty Acids and ruminal pH in situ ammoniacal nitrogen shows differences between treatments at the different sampling times, obtaining the highest (P <0.05) pH and N-NH3 the animals fed diets D2 and D3 respectively. Regarding VFAs, acetic acid is higher (P <0.05) in bulls fed with D2 and D3. Propionic acid was higher (P = 0.0001) in bulls fed D2 and D3 (0 h) and higher (P = 0.0001) in animals fed D1 and D3 (4 h). Key words: in vitro, in situ, digestibility, gas production, degradation, dry matter, organic matter.