Aspectos qualitativos de ovos comerciais submetidos a diferentes condições de armazenamento

Este trabalho foi conduzido com o objetivo de avaliar o efeito da temperatura e do tempo de armazenamento sobre a qualidade de ovos de poedeiras comerciais. O delineamento utilizado foi inteiramente casualizado em esquema fatorial 3x3 sendo 3 temperaturas (temperatura ambiente - 26°C, geladeira - 10°C e câmara fria - 3°C) e 3 períodos de armazenamento (7, 14 e 21 dias), com 6 repetições, distribuídos em esquema inteiramente aleatorizado em que cada ovo representou uma unidade experimental. As variáveis avaliadas foram perda de peso dos ovos (%), gravidade específica, porcentagem de gema e albúmen, coloração da gema e avaliação sensorial. Os ovos mantidos sob temperaturas de refrigeração (geladeira e câmara fria) apresentaram menores perdas de peso e melhores valores para gravidade específica e coloração de gema crua no período de armazenamento (14 e 21 dias). Para porcentagem de gema e albúmen os ovos não apresentaram diferença (p>0,05) entre os tempos de armazenamento, independente da temperatura a qual foram submetidos. Os ovos mantidos sob refrigeração obtiveram melhores características sensoriais que aqueles mantidos sobre temperatura ambiente. Conclui-se que, nas condições experimentais adotadas, os ovos devem ser mantidos em temperatura de refrigeração (3 a 10°C) para que mantenham sua qualidade preservada

Effects of Music Therapy on Neuroplasticity, Welfare, and Performance of Piglets Exposed to Music Therapy in the Intra- and Extra-Uterine Phases

The rearing environment of pigs can cause a high level of stress due to the lack of stimuli and the impossibility of carrying out natural behaviors. Music therapy is a way to enrich the environment and promote stress relief. Few studies in swine using environmental enrichers focus on functional benefits, such as stress resilience, improved biological functions, or mental status. The effect of environmental enrichment on neurobiological processes is particularly poorly understood in farm animals. Thus, our study sought to elucidate the influence of music in piglets exposed to music therapy in the intrauterine and extrauterine phase on neuroplasticity, evaluating the levels of brain-derived neurotrophic factor (BDNF). Behavioural responses were also evaluated using fear tests related to stress resilience. The productive performance of these piglets was analysed to relate the possible reduction in stress levels to greater productivity gains. Forty-eight sows were used at 90 days of gestation until the weaning of their piglets. In the gestation phase, the sows were divided into two treatments: control (without music therapy) and music (with music therapy). In the farrowing/lactation phase, the sows were separated into four treatments: control-control (no music in any phase); control-music (music only in farrowing/lactation); music-control (music only during pregnancy); and music-music (music in both reproductive phases). Music therapy did not cause a difference in the BDNF levels of piglets at birth. However, piglets born from sows of the music-music treatment did not show a reduction in BDNF between birth and weaning, unlike the other treatments. Exposure to music in the last 1/3 of pregnancy and farrowing/lactation improved the weight of piglets at birth and at weaning. Musical enrichment during pregnancy and lactation was able to cause changes in the piglets’ neuroplasticity and improve their productive performances