RESUMO
The effects of the replacement of dry ground corn (GC) with corn-grain silage rehydrated with water (RCSwater), cactus pear mucilage (RCSmucilage), and whey (RCSwhey) on the growth, physicochemical composition, and fatty acid profile of goat kids' meat were investigated. Thirty-two crossbred goat kids (16.4 ± 2.50 kg initial weight) were assigned in a randomized block design with four treatments and eight repetitions. The NDF intake of goat kids fed with RCSmucilage was higher in comparison to RCSwater and RCSwhey (p = 0.0009). The dietary replacement of GC by RCSmucilage increased the final weight (p = 0.033) and meat-cooking losses (p = 0.0001) of kids. The concentrations of oleic (p = 0.046), 11,14-eicosadienoic (p = 0.033), and EPA (p = 0.010) were higher in the meat of kids fed with RCSmucilage and RCSwhey, and the α-linolenic concentration was higher (p = 0.019) for animals feeding with RCSmucilage. Meat from kids fed with RCSwhey presented the lowest ∑SFA and the highest ∑MUFA. In contrast, the ∑PUFA (p < 0.012) was higher for goats fed with RCSwater. The ∑ω3 (p < 0.0001) was higher in animals fed with RCSmucilage and RCSwhey. Desirable fatty acids were higher (p = 0.044) in animals fed with RCSmucilage and RCSwhey, and the atherogenicity (p = 0.044) and thrombogenicity (p < 0.0001) indexes were lower for goats fed the RCSwhey diet. The enzymatic activities of Δ9desaturase (C16) were higher (p = 0.027) in goat kids fed with GC and RCSmucilage, and Δ9desaturase (C18) was higher (p = 0.0497) when goats were fed with RCSmucilage and RCSwhey. Elongase activities were higher (p = 0.045) in goat kids fed with GC and RCSwater. The total replacement of GC by RCSmucilage is recommended in the diet of goat kids due to improvements in the weight gain and proportion of desirable fatty acids in the meat. In addition, RCSmucilage promoted better conservation of the silage at a lower cost when compared to commercial additives.
RESUMO
Buriti (Mauritia flexuosa L.) oil (BO) is a byproduct that can be incorporated into the diet of lambs, thus increasing the energy density. The study aimed to evaluate the optimum BO inclusion level in lamb diets. Sixty-five Santa Ines lambs were distributed in two completely randomized experiments with five treatments each (BO inclusion at 0 (control), 12, 24, 36 and 48 g/kg dry matter (DM) total). The BO supplementation to partially replace ground corn linearly decreased the nutrient intake and digestibility of DM, ether extract and neutral detergent fiber (NDF), N° chews/bolus, DM and NDF rumination or eating efficiencies, the N intake and N balance, carcass weights and yields, and dressing content of lamb carcasses (p < 0.05). The addition of BO responded quadratically to DM eating efficiency and N-fecal and N-urinary excretion (p < 0.05). The linear response plateau (LRP) analysis demonstrated that the levels of 0 and 12 g/kg of BO were similar, and improved intake and digestibility and consequently performance (p < 0.001). There was a linear increase in feed efficiency and shrinkage after chilling with the BO inclusion replacing ground corn. The inclusion of 12 g/kg BO in the total DM of diet is recommended, because it improves feeding intake, digestibility and performance of lambs.
RESUMO
The research was conducted to evaluate the production of fodder legumes used in the production of hay. The experiment was conducted in of Federal University of Piaui in Bom Jesus, Piaui. The design was a randomized blocks with six treatments and three replications. Six forage legumes were used: Macroptillium lathyroides Access 1, Access 2, Access 3, Stylosanthes capitata, Cajanus cajan, Neonotonia wightti. The variables evaluated were: number of plants, green mass of forage production (t ha-1 ) and height. Data were statistically analyzed by Tukey's test at a significance level of 5%. All variables showed differences between the six species of forage legumes (p<0,05). For number of plants per linear meter the S. capitata and N. wightti were higher than 20.00 and 18.00, respectively. The S. capitata and M. lathyroides present better productive characteristics between species.
Assuntos
Cajanus/química , Fabaceae/química , Fenômenos Biológicos/análiseRESUMO
The research was conducted to evaluate the production of fodder legumes used in the production of hay. The experiment was conducted in of Federal University of Piaui in Bom Jesus, Piaui. The design was a randomized blocks with six treatments and three replications. Six forage legumes were used: Macroptillium lathyroides Access 1, Access 2, Access 3, Stylosanthes capitata, Cajanus cajan, Neonotonia wightti. The variables evaluated were: number of plants, green mass of forage production (t ha-1 ) and height. Data were statistically analyzed by Tukey's test at a significance level of 5%. All variables showed differences between the six species of forage legumes (p<0,05). For number of plants per linear meter the S. capitata and N. wightti were higher than 20.00 and 18.00, respectively. The S. capitata and M. lathyroides present better productive characteristics between species.(AU)