No abstract

The objective of this study was to evaluate quality of meat from hair lambs fed different energeticsources in the finishing phase. Twenty-eight hair lambs with an initial body weight (BW) 20.8 ±3.01, were randomly assigned to one of four dietary treatments included with seven lambs pertreatment included an energy source included at 18% dry matter: S. spectabilis flour (SF), palm kernel (PK), corn bran (CB) and rice bran (RB) in a diet based in corn silage, ground corn, soybean meal formulated to 13% PC and 2.6 Mcal/Kg DM. The feeding was performed for 13 weeks. Animals were slaughtered after the feeding trial, and the carcasses were kept at 4°C for 24 hours under Colombian standard guidelines. 0 and 24 hours after slaughter from the Longissimus dorsi of the left half carcass between 12th and 13th ribs for color analysis (L*, a*, and b*) and pH. Thestatistical model included the effects of diet, time, and their interactions. There was no effect of treatment on pH and L* and b* indices (P > 0.05). Aging time increased b* values and reduces the pH values, L* values and a* values (P < 0.05). The a* values were higher in the time 0 and 24 for the RB treatment (P < 0.05). On the other hand, there is no effect of the interaction of treatment x time in the pH, L* an and b* values. In conclusion, meat quality from lambs fed different energetic sources at 18% of DM is not influenced by the diet.

The objective of this study was to evaluate the effects of different energy sources on performance, and carcass characteristics in hair lambs finished in feedlots. Twenty-eight hair lambs with an initial body weight (BW) 20.8 ± 3.01, were randomly assigned to one of four dietary treatments included with seven lambs per treatment. The dietary treatments included an energy source included at 18% Dry matter: S. spectabilis flour (SF), palm kernel (PK), corn bran (CB) and rice bran (RB) in a diet based in corn silage, ground corn, soybean meal formulated to 13.0% PC and 2.6 Mcal/Kg of DM. The feeding trial was performed for 13 weeks. Water was allowed ad libitum. Animals were slaughtered after the feeding trial, and the carcasses were kept at 4°C for 24 h under Colombian standard guidelines. Data were analyzed by using the ANOVA procedure, SAS version 9.1 to perform a randomized complete experiment with four diets. For each studied variable, the mean and standard error of the mean (SEM) were calculated and differences between means were evaluated Using Tukey′s Test (P ≤ 0.05). Final body weight, hot carcass weight, cold carcass weight, hot dressing carcass (%), and cold dressing weight (%) were not different between the four treatments (P > 0.05). Dry matter intake was superior to the S. spectabilis flour (P < 0,001). Feed efficiency was higher in the CB and RB treatments (P < 0,05). These results indicate that the inclusion of S. spectabilis and palm kernel could improve the dry matter intake and corn bran and rice bran the feed efficiency without effects on carcass characteristics

Colombian sheep production is carried out in extensive pastures with a low percentage of protein and high fiber levels that lead to low weight gains. The aim of this study was to evaluate intake, digestibility, rumen kinetics, and blood metabolites in hair lambs fed Samanea saman and Cordia dentata. Twelve hair lambs were distributed in an experimental 4x4 Latin square design, with four treatments and four experimental periods. Treatments were T1:100 % Dichanthium spp hay, T2: 80 % Dichanthium spp hay, 20 % S. saman, T3: 80 % Dichanthium spp hay, 20 % C. dentata, T4: 80 % Dichanthium spp hay, 10 % S. saman, and 10 % C. dentata. The highest nutrients intakes were obtained with diets containing tree foliage compared with the T1 diet (p< 0,05). In vivo and In vitro digestibility of DM, OM and, NDF of tree leaves diets showed higher values than the T1 diet (p<0,05). Digestible and metabolizable energy were similar between tree leaves diets (p<0,05). Blood urea nitrogen values were superior for animals fed the T2 diet (p<0,05). Degradability values at 96 hours were higher for the T2 diet (p<0,05). Potential degradability was superior for the T3 diet. The results of this study demonstrate that S. saman and C. dentata leaves improve nutrients intake and digestibility. Therefore, they can be an alternative for sheep in the tropical dry forest.