Fermentação Ruminal IN SITU de Dietas Contendo Farelo do Mesocarpo do Babaçu e Propilenoglicol na Água.

Abstract

The objective of this work was to evaluate the in situ ruminal fermentation of bulky and concentrated diets with the inclusion of propylene glycol (PEG) in water. The diets were composed of Babaçu Mesocarp Bran (FMB) and Mombaça grass as source of bulky and corn grain and soybean meal as concentrate source in the voluminous proportions: concentrate of 100: 0; 50:50 and 0: 100 respectively. The PEG levels (0.0 and 3.0%) were provided in oral water trough. Two rumen cannulated Dutch-zebu male bovine animals with mean weight of 500 ± 21 kg were confined in individual bays for compound 5 days of adaptation and 4 days of crossing-over design. The samples of diets were ground into 1 mm particles, distributed in small bags of TNT and incubated directly in the rumen for 0, 6, 12, 24, 48, 72 and 96 hours. The data were submitted to analysis of variance and the equations and means were compared by means of the parallelism test and the curve identity. The mean values of effective dry matter degradability (DEMS) at 2% / h for the concentrate samples (C); Voluminous: concentrate (V_C) and bulky (V) were 79.22%; 76.76% and 72.78% respectively. There was no significant difference (p> 0.05) in the DEMS for bulk: concentrate (V_C) and bulk (V) with the inclusion of PEG, the degradation curves were identical and parallel to each other, therefore under these conditions it is not advantageous Its use. The inclusion of the PEG improved the use of the diet with predominance of concentrate with higher values of degradation at 96 hours of incubation. In view of the above, it is possible to use PEG in diets with more digestible substrates such as concentrate, since it improves nutrient utilization, however, further studies should be conducted to indicate the economic viability of PEG inclusion and clarify the Its role in the metabolism of ruminants.