The effect of replacing a commercial feed with hydroponic green barley forage (HGBF) was studied on productive performance and carcass yield of growing New Zealand rabbits. Four mixed diets based on a pelleted commercial feed (15.7% crude protein and 12.3% crude fi ber) were made by substituting wet HGBF (containing 16.1% dry matter, 2.18% crude protein and 2.36% crude fi ber) for the commercial feed (0, 10, 20 and 30%). Sixty-four rabbits, 35 d of age and with an average body weight of 917±9.7 (standard error) g were assigned to the 4 treatments and caged in groups of 4 rabbits (2 females and 2 males/cage). HGBF was grown for 15 d, and administered immediately after harvesting, including the radicular pad (roots and seed) and leaves. Feed intake and growth rate from 35 to 70 d of age were recorded. The rabbits were then slaughtered and the dressing-out percentage computed. Both dry matter feed intake and growth rate decreased linearly by 0.75±0.091 g/d (P<0.001) and 0.20±0.040 g/d (P<0.001) per unit of HGBF increase. Rabbits consumed daily all the HGBF offered 0, 2.3, 4.6 and 7.0 g DM for 0, 10, 20 and 30% substitution level, respectively. Feed conversion (average 3.26±0.026) and carcass yield percentage (average 58.1±0.32 %) were not affected by treatments. It was therefore concluded that replacing pelleted commercial feed by wet HGBF impaired growth performances.

In this work, a novel route is discussed to produce in one step ZnO/Burkeite powders by the modified solution combustion method. The ZnO particles enhance the photocatalytic activity in the degradation of Rhodamine B, in which Burkeite mineral acts as a support due to the pH-dependent morphology of the particle aggregates of the as-synthesized powders. The X-ray diffraction (XRD) characterization shows the presence of a heterostructure: ZnO/Burkeite. The Scanning Electron Microscopy (SEM) image shows a morphological dependence with the pH of the solution used for the synthesis. The results show that the system with the highest degradation (92.4%) corresponds to the case in which ZnO/Burkeite heterostructure was synthesized with a pH 11.

Efecto del uso de ensilado seco de salmón en dietas de pollos broiler sobre parámetros productivos y calidad sensorial de la carneThe effects of using dried salmon silage in broiler chicken diets on productive performance and meat sensory quality SUMMARYThe aim of this study was to determine the effect of using dried salmon silage in broiler diets on performance parameters and meat sensory quality. Dried salmon silage (ESS) was obtained from salmon wastes, processed by acid digestion and co-dried with wheat bran (70:30, respectively). Three hundred Ross 308 broiler chickens were used, and randomly distributed to five feeding groups: control, C (0% ESS), T1 (4% ESS), T2 (8% ESS), T3 (12% ESS) and T4 (15% ESS). The chicks were fed for 32 days with these diets, and with control diet only from day 33 to day 42. The following performance parameters were quantified: mortality percentage (%M), body weight (PV), daily weight gain (GPV), feed intake (CA), and feed conversion (ECA). After day 42, samples of breast and drumstick meat were obtained for sensory analysis. The diets used were isoproteic and isoenergetic. The use of ESS did not have a significant effect on %M, PV, GPV, CA and ECA (P < 0.05), and neither did it affect the sensory quality of breast and drumstick meat. In conclusion ESS can be used as an important contribution to broiler feed, and an alternative to protein concentrates that are currently in the market. Additionally, the inclusion of ESS up to 15% in broiler diets until day 32 does not generate adverse effects on productive performance, and breast and drumstick meat sensory quality.

dos especies de hormigas, se trabajó con cinco grupos de : Solenopsis gayi y cinco grupos de hormigas Brachymyrmex giardii. Diez hormigas por nido desde nidos de Solenopsis gayi fueron transferidas a nidos de hormigas Brachymyrmex giardii (residentes) y diez hormigas por nido de B. giardii fueron transferidas,en igual forma, a nidos de hormigas S. gayi (residentes). Se observó, durante dos minutos, la presencia o ausencia de los siguientes eventos conductuales:exploración antenal (EA), abertura mandibular(AM), mordedura (MO), flexión ventral de abdomen (FVA), flexión dorsal de abdomen (FDA), lucha (L), transporte de la intrusa (TI) y retroceso (R) Después de la observación de cada evento. se calculó el tiempo medio de presentación y su desviación estándar. El análisis de las frecuencias se realizó usando pruebas de independencia con χ². El tiempo medio de presentación de cada evento entre especies y entre nidos fue comparado utilizando un análisis de varianza anidado. Como resultado del cálculo de χ² en las transferencias de B. giardii hacia S. gayi y desde S. gayi hacia B. giardii se pudo constatar que en todas ellas hubo una diferencia significativa en la frecuencia de presentación de los distintos eventos conductuales, a excepción de los eventos flexión dorsal de abdomen y retroceso, los cuales presentaron 0 y 1 observación, respectivamente. El análisis de varianza mostró que en exploración antenal, abertura mandibular y flexión ventral de abdomen, hubo diferencias significativas tanto entre especie como entre nidos. Para los eventos mordedura y lucha no hubo diferencias significativas entre especies, pero sí entre nidos. Para los eventos transporte de la intrusa y retroceso no se observaron diferencias significativas entre especies, tampoco entre nidos.

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