Degradabilidad ruminal de grasas de sobrepaso

Abstract

Research was conducted to determine ruminal degradadation of bovine fat and swine fat treated with different levels (0.0, 20.0 y 40.0%) of Calcium Chloride at 12 and 24 hr ofincubation. Three 3 years old ruminal cannulated steers with an average weigth of 325 kg were fed ad libitum a diet of oats hay and clean water. Ruminal degradation of both fats was determined using the in-situ nylon bag technique. Bag size was 8.0 x 20.0 cm, with 3025 pores per cm². Three bags by treatment and by incubation period, containing 5 gr. of treated fat, were suspended in the rumen tied to a 50 cm. long nylon string. When the bags were removed from the rumen, they were washed under clean running water for 5 minutes, and placed in an oven for 48 hr. Thereafter, the bags were weighted and by difference ruminal degradation was determined. Results were analyzed by a completely random model with equal number of repetitions and a factorial array 2x2x3. 

Ruminal degradation of bovine fat treated with 0.0, 20.0 and 40.0% Calcium Chloride decreased (P<0.05) as the levels of Calcium Chloride increased, at 12 hr of incubation (42.00,23.25 and 7.54%, respectively) and at 24 hr of incubation(58.43, 29.24 and 11.44%, respectively). A similar trend(P<0.05) was observed with swine fat. The values found at 12 hr of incubation were 47.14, 32.13 and 15.80%, while those at 24 hr of incubation were 52.07, 44.46 and 18.82%, respectively for the treatments with 0.0, 20.0 and 40.0% Calcium Chloride. Differences (P<0.05) in ruminal degradation of bovine fat and swine fat were found among treatments and between periods of incubation. Treatment of fats with Calcium Chloride decrease their ruminal degradation. Therefore, it is highly recommended that such treatments be used for animals with high energy requirements.