Experimental infection of Salmonella Enteritidis in quails submitted to forced molting by feed fasting

Santos, I. L.; Teixeira, R.S.C.; Lopes, ES; Albuquerque, Átilla Holanda de; Silva, RC Rocha e; Salles, Rosa Patrícia Ramos; Machado, DN; Horn, RV; Bezerra, Wga; Buxadé, C.; Maciel, WC

doi:10.1590/1516-635x170131-36

Cited by 3 publications

(1 citation statement)

References 28 publications

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“…In this study, we investigate what effects longer-term and commercially-relevant disturbances would have on sleep in laying hens, namely food deprivation, heat stress, and foot pain. Feed deprivation is not often thought of as being a problem in modern poultry production; however, it is actively used as a means of inducing moulting in laying hens in some countries (see [35,36]). The negative welfare implications of this practice may be magnified if sleep were also to be impacted.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Commercially-Relevant Disturbances on Sleep Behaviour in Laying Hens

Putyora,

Brocklehurst,

Sandilands

2023

Animals

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Ensuring the welfare of commercially kept animals is a legal and ethical responsibility. Sleep behaviour can be sensitive to environmental perturbations and may be useful in assessing welfare state. The objective of this study was to use behavioural and electrophysiological (EEG) measures to observe the effects of 24 h stressors followed by periods of no stressors on laying hen sleep behaviour, and to investigate the use of sleep behaviour as a means of welfare assessment in commercial poultry. Ten laying hens surgically implanted with EEG devices to record their brain activity over four batches were used. Hens were subjected to undisturbed, disturbed and recovery periods for 24 h. Disturbed periods consisted of either feed deprivation, increased ambient temperature (28 °C) or simulated footpad pain via injection of Freund’s adjuvant into the footpad. Sleep state was scored using behaviour data from infrared cameras and EEG data. Over all periods, hens engaged in both SWS (average 60%) and REM sleep (average 12%) during the lights-off period. Feed deprivation and footpad pain had little to no effect on sleep states, while increased ambient temperature significantly reduced REM sleep (to near elimination, p < 0.001) and SWS (p = 0.017). During the lights-on period, footpad pain increased the proportion of time spent resting (p = 0.008) and in SWS (p < 0.001), with feed deprivation or increased ambient temperature (p > 0.05) having no effect. Increasing ambient temperatures are likely to affect sleep and welfare in commercially-kept laying hens in the face of global climate change.

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Section: Introductionmentioning

confidence: 99%

The Effects of Commercially-Relevant Disturbances on Sleep Behaviour in Laying Hens

Putyora,

Brocklehurst,

Sandilands

2023

Animals

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Prenatal auditory stimulation and impacts on physiological response to feed restriction in broiler chickens at market age

Ahmad-Hanafi,

Zulkifli,

Ramiah

et al. 2024

Poultry Science

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Acute phase proteins response to feed deprivation in broiler chickens

Najafi¹,

Zulkifli²,

Soleimani³

et al. 2016

Poultry Science

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Feed deprivation in poultry farming imposes some degree of stress to the birds, and adversely affects their well -being. Serum levels of acute phase proteins (APP) are potential physiological indicators of stress attributed to feed deprivation. However, it has not been determined how long it takes for a measurable APP response to stressors to occur in avian species. An experiment was designed to delineate the APP and circulating levels of corticosterone responses in commercial broiler chickens to feed deprivation for 30 h. It was hypothesized that feed deprivation would elicit both APP and corticosterone (CORT) reactions within 30 h that is probably associated with stress of hunger. Twenty-one day old birds were subjected to one of 5 feed deprivation periods: 0 (ad libitum, AL), 6, 12, 18, 24, and 30 h. Upon completion of the deprivation period, blood samples were collected to determine serum CORT, ovotransferrin (OVT), α1-acid glycoprotein (AGP), and ceruloplasmin (CP) concentrations. Results showed that feed deprivation for 24 h or more caused a marked elevation in CORT (P=0.002 and P<0.0001, respectively) when compared to AL. However, increases in AGP (P=0.0005), CP (P=0.0002), and OVT (P=0.0003) were only noted following 30 h of feed deprivation. It is concluded that elicitation of AGP, CP, and OVT response may represent a more chronic stressful condition than CORT response in assessing the well-being of broiler chickens.

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Experimental infection of Salmonella Enteritidis in quails submitted to forced molting by feed fasting

Cited by 3 publications

References 28 publications

The Effects of Commercially-Relevant Disturbances on Sleep Behaviour in Laying Hens

The Effects of Commercially-Relevant Disturbances on Sleep Behaviour in Laying Hens

Prenatal auditory stimulation and impacts on physiological response to feed restriction in broiler chickens at market age

Acute phase proteins response to feed deprivation in broiler chickens

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