Abstract:ABSTRACT:The objective of this study was to determine the energy balance of the poultry-shed system and its effect on broiler performance during the production cycle. The experimental design was completely random with sub-divided blocks. The blocks were composed of five different types of sheds and the sub-blocks of the evaluation times (00:00 h to 23:00 h), allowing an analysis of variance and a comparison between means with the Tukey test. There were no significant differences between the mean values of the … Show more
“…Existen diferentes factores que pueden afectar la cantidad y la producción de calor, como la actividad física, la temperatura del ambiente, los ritmos circadianos, entre otros (Syafwan, Kwakkel y Verstegen, 2011; Lara y Rostagno, 2013; Fisinin y Kavtarashvili, 2015; Baracho y col., 2019). Por lo tanto, para mantener la temperatura corporal dentro de la zona termoneutral, los pollos disipan el exceso de calor al medio ambiente a través de la conducción celular y la convección vascular (Baracho y col., 2011;Da Silva, Pandorfi y Guiselini, 2015;Nilsson, Molokwu y Olsson, 2016;Nascimento y col., 2017).…”
The research evaluated the impact of three pesticides on Eisenia fetida in the cultivation of Allium cepa (onion) in thedistrict of Lurín, Lima, Peru. The mean lethal dose values (LD50) at 14 days, evasion percentage and food activity were evaluated as well as the exposure ratio of the toxic (TER) and the environmental risk coefficient (RQ) on pesticides zeta-cypermethrin, pendimethalin and profenofos based on ecotoxicological tests with E. fetida. The LD50 values atan exposure time at 14 d for the three pesticides were: zeta cypermethrin>profenofos>pendimethalin. A relationship with the dose of pesticides close to the LD50 was calculated for the evasion and for food activity. TER value for thethree pesticides was calculated which indicated no ecotoxicological impact for E. fetida. However, in the CR value,there were high risk values in the total, where zeta-cypermethrin indicated 92.77% of the environmental risk, whilependimethalin presented the lowest environmental risk with 0.09%. Within Peruvian legislation, these pesticides are still allowed to be used; hence, based on this research, it is suggested that zeta-cypermethrin be evaluated in more detail, because it was the only pesticide that presented a significant CR. In conclusion, zeta-cypermethrin causes an environmental impact on the onion crop in Lurin.
“…Existen diferentes factores que pueden afectar la cantidad y la producción de calor, como la actividad física, la temperatura del ambiente, los ritmos circadianos, entre otros (Syafwan, Kwakkel y Verstegen, 2011; Lara y Rostagno, 2013; Fisinin y Kavtarashvili, 2015; Baracho y col., 2019). Por lo tanto, para mantener la temperatura corporal dentro de la zona termoneutral, los pollos disipan el exceso de calor al medio ambiente a través de la conducción celular y la convección vascular (Baracho y col., 2011;Da Silva, Pandorfi y Guiselini, 2015;Nilsson, Molokwu y Olsson, 2016;Nascimento y col., 2017).…”
The research evaluated the impact of three pesticides on Eisenia fetida in the cultivation of Allium cepa (onion) in thedistrict of Lurín, Lima, Peru. The mean lethal dose values (LD50) at 14 days, evasion percentage and food activity were evaluated as well as the exposure ratio of the toxic (TER) and the environmental risk coefficient (RQ) on pesticides zeta-cypermethrin, pendimethalin and profenofos based on ecotoxicological tests with E. fetida. The LD50 values atan exposure time at 14 d for the three pesticides were: zeta cypermethrin>profenofos>pendimethalin. A relationship with the dose of pesticides close to the LD50 was calculated for the evasion and for food activity. TER value for thethree pesticides was calculated which indicated no ecotoxicological impact for E. fetida. However, in the CR value,there were high risk values in the total, where zeta-cypermethrin indicated 92.77% of the environmental risk, whilependimethalin presented the lowest environmental risk with 0.09%. Within Peruvian legislation, these pesticides are still allowed to be used; hence, based on this research, it is suggested that zeta-cypermethrin be evaluated in more detail, because it was the only pesticide that presented a significant CR. In conclusion, zeta-cypermethrin causes an environmental impact on the onion crop in Lurin.
“…Poultry farming in Brazil is the most prominent agricultural activity in the international market and has been the leader in exports and second place in world production since 2004, only behind the United States (Silva et al, 2015).…”
The objective of this research was to analyze the differences between the food behaviors observed under the factors of production environment, sex and lighting system, using stochastic tools of multivariate analysis. As for the thermal characteristics of the environment, air temperature (T, °C), enthalpy (H, kJ kg -1 ), and black globe temperature and humidity index (BGTHI) showed high positive correlation with each other and strong negative correlation with relative humidity (RH, %). The "male drinking" behavior was positively associated with thermal characteristics of the environment in the three periods of the day, that is, the act of drinking more water would be a way to alleviate thermal stress. Birds subjected to red LED showed a strong negative correlation with temperature associated with the "female drinking" behavior, in the afternoon period, according to the principal component analysis, which is justified by the orientation of the broiler house with its longitudinal axis in the NE/SW direction, so the sunlight directly hits the area where the drinker was located. Variation in body weight showed better response when the birds were exposed to a temperature of 27 °C, for the 5 th week of the rearing cycle.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.