In the farrowing stage, to use heated creeps is crucial for meeting the thermal requirements of newborn piglets and alternatives for environmental enrichment to attract the animals to the creeps. The objective of this study was to evaluate the behavior and productive performance of piglets submitted to creeps enriched with different types of sensory stimuli. The study had a completely randomized design. The animals were (which was not peer-reviewed) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity.The copyright holder for this preprint . http://dx.doi.org/10.1101/346023 doi: bioRxiv preprint first posted online Jun. 13, 2018; 2 every 15 min (on/off), from 8 am to 5:45 pm (21 consecutive days). The environmental conditions of the creeps -air temperature, relative humidity, luminous intensity, and decibels -were evaluated within the creeps with environmental enrichment to determine the influence on the piglets' behavior and productive performance. The results show that piglets submitted to creeps with environmental enrichment with blue artificial light and thyme essential oil showed reduced frequency outside the creeps when compared with treatment T6 (control). This showed the reduction of the stay of piglets in areas susceptible to crushing, in proximities to the mother. Piglets showed greater preference for creeps enriched with fragrance diffusion of thyme essential oil and with blue artificial lighting. 11

The low uniformity in light distribution provided by conventional lighting systems installed in laying poultry can compromise the productive performance and egg quality of laying hens. Thus, the aim of the current study is to evaluate the effect of a linear lighting system with light-emitting diode (LED strip) on the productive performance and egg quality of laying hens, by comparing it to the conventional LED lamp lighting system. The study used Hy-Line Brown hens from a commercial production unit. Hen-day egg production (%), mortality rate (%), egg weight (g), albumen height (mm), Haugh unit, eggshell thickness, eggshell strength, and thermal-environment conditions were evaluated from the 19th to the 48th wk of age. The results have shown that LED strips were capable of improving egg production ( P < 0.05) in comparison to LED lamps. Egg quality was not affected ( P > 0.05) by the evaluated lighting systems throughout the experimental period. Results of the current study indicate that the homogeneous illuminance distribution provided by the linear LED strip lighting system at different cage floors improved egg production in comparison to the conventional LED lamp lighting system.

RESUMOA suinocultura busca melhorias para a eficiência da produção e o bem-estar dos animais, a fim de atender as exigências do mercado consumidor. Atender as demandas de mercado é condição importante para manter a posição do Brasil em quarto lugar na posição do ranking mundial dos exportadores de carne suína (ABIPECS, 2012).Recebido em 4 de abril de 2013 Aceito em 11 de junho de 2015 E-mail: karinarastor78@gmail.com As questões referentes ao bem-estar animal estão diretamente relacionadas ao conforto térmico dos suínos. Para isto, é imprescindível fornecer ambientes adaptados às condições climáticas, tendo em vista melhorar a qualidade de vida deles. Por isto, sugerem-se estudos para melhorar as condições ambientais aos suínos.

No abstract

R E S U M OO uso racional de energia elétrica em creches suínas pode ser viabilizado sem afetar o desempenho produtivo dos animais visando à sustentabilidade do setor razão por que o objetivo deste trabalho foi avaliar a eficiência de duas tecnologias de controle de temperatura em sistema de aquecimento resistivo em creche suína, no uso de energia elétrica e no ganho de peso dos leitões. Os sistemas avaliados foram: resistências elétricas suspensas com controle PID (proporcional, integral e derivativo) e resistências elétricas suspensas com termostato. O experimento foi realizado durante o período de inverno, entre maio e setembro de 2013. Os critérios de comparação foram: consumo de energia elétrica (kWh), consumo específico (kWh kg ). O sistema de aquecimento com controlador PID, apesar de apresentar maior consumo médio, foi mais eficiente quanto ao uso de energia elétrica para produzir 1 kg de peso vivo (2,88 kWh kg Use of PID controller as efficient technology in heating system of swine nursery A B S T R A C TThe rational use of energy in swine nurseries can be made possible without affecting the productive performance of animals, aiming the sustainability of the sector. The objective of this study was to evaluate the efficiency of two technologies for temperature control of resistive heating system for swine nursery on the use of electricity by the systems and on the weight gain of the piglets. The evaluated systems were: overhead electric heaters with PID (proportional, integral and derivative) control and suspended electric heaters with thermostat. The experiment was conducted during the winter period between May and September 2013. The comparison criteria were: electricity consumption (kWh), specific consumption (kWh kg ). The heating system with PID controller, although showed a higher average consumption, was more efficient as the electricity used to produce 1 kg of body weight (2,88 kWh kg ) and for weight gain of piglets (7,3 kg) compared to the system with thermostat (3,98 kWh kg -1 , 1,03 R$ kg -1 and 5,2 kg, respectively). Palavras-chave:suinocultura economia energia elétrica leitões desmamados controle de temperatura