Food intake control in birds

Denbow, D. Michael

doi:10.1016/0149-7634(85)90047-8

Cited by 42 publications

(11 citation statements)

References 145 publications

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“…Leptin was found to reduce adiposity and liver triglyceride content in part by reducing SCD-1 mRNA and enzymatic activity in liver (Cohen et al 2002). Such exciting data, which are currently lacking in non-mammalian species, prompted us to investigate the regulatory effects of leptin on SCD gene expression in three metabolically important tissues, namely the liver (the main site of lipogenesis (Leveille et al 1968)), the hypothalamus (the site of food intake and energy homeostasis control (Robinzon et al 1975, Denbow 1985), and the muscle (the main site of thermogenesis (Duchamp & Barré 1993)). …”

Section: Discussionmentioning

confidence: 99%

The regulation of stearoyl-CoA desaturase gene expression is tissue specific in chickens

Dridi¹,

Taouis²,

Gertler³

et al. 2007

Journal of Endocrinology

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Emerging evidence suggests a potential role of stearoyl-CoA desaturase (SCD)-1 in the control of body weight and energy homeostasis. The present study was conducted to investigate the effects of several energy balance-related factors (leptin, cerulenin, food deprivation, genotype, and gender) on SCD gene expression in chickens. In experiment 1, 6-week-old female and male broiler chickens were used. In experiment 2, two groups of 3-week-old broiler chickens were continuously infused with recombinant chicken leptin (8 mg/kg/h) or vehicle for 6 h. In experiment 3, two groups of 2-week-old broiler chickens received i.v. injections of cerulenin (15 mg/kg) or vehicle. In experiment 4, two broiler chicken lines (fat and lean) were submitted to two nutritional states (food deprivation for 16 or 24 h and feeding ad libitum). At the end of each experiment, tissues were collected for analyzing SCD gene expression. Data from experiment 1 showed that SCD is ubiquitously expressed in chicken tissues with highest levels in the proventriculus followed by the ovary, hypothalamus, kidney, liver, and adipose tissue in female, and hypothalamus, leg muscle, pancreas, liver, and adipose tissue in male. Female chickens exhibited significantly higher SCD mRNA levels in kidney, breast muscle, proventriculus, and intestine than male chickens. However, hypothalamic SCD gene expression was higher in male than in female (P!0 . 05). Leptin increased SCD gene expression in chicken liver (P!0 . 05), whereas cerulenin decreased SCD mRNA levels in muscle. Both leptin and cerulenin significantly reduced food intake (P!0 . 05). Food deprivation for either 16 or 24 h decreased the hepatic SCD gene expression in fat line and lean line chickens compared with their fed counterparts (P!0 . 05). The hypothalamic SCD mRNA levels were decreased in both lines only after 24 h of food deprivation (P!0 . 05). In conclusion, SCD is ubiquitously expressed in chickens and it is regulated by leptin, cerulenin, nutritional state, and gender in a tissue-specific manner.

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Section: Discussionmentioning

confidence: 99%

The regulation of stearoyl-CoA desaturase gene expression is tissue specific in chickens

Dridi¹,

Taouis²,

Gertler³

et al. 2007

Journal of Endocrinology

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“…However, con centrated PRL binding activity is present in brain regions that have been implicated as part of the neural substrate 744 Buntin/Ruzycki/Witebsky Prolactin Receptors in Brain underlying some of the physiological and behavioral changes that occur following central or peripheral admin istration of PRL in this species. These include the PVN, VMN, and LHy for feeding behavior [27][28][29]; the POA, SL, BPC, LHy, and tuberal hypothalamus for gonadotro pin regulation [30][31][32], and the POA for parental behav ior [5,33,34], Whether these brain sites actually partici pate in PRL-induced changes in behavior and neuroen docrine function has yet to be directly tested in most cases. However, a recent intracranial injection study sug gests that the VMN (and possibly the POA) is an impor tant site of PRL action in promoting feeding activity in doves [35], Similarly, the possibility that PRL acts at least in part on the POA to promote parental behavior in verte brates is strengthened by recent evidence that direct injec tion of PRL into the POA facilitates maternal behavior in steroid-primed female rats [5] and by the observation that PRL binding activity in the POA is higher in parental …”

Section: Discussionmentioning

confidence: 99%

Prolactin Receptors in Dove Brain: Autoradiographic Analysis of Binding Characteristics in Discrete Brain Regions and Accessibility to Blood-Borne Prolactin

Buntin¹,

Ruzycki²,

Witebsky³

1993

Neuroendocrinology

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Film autoradiography and densitometry were employed to obtain a detailed map of prolactin (PRL) receptor distribution in ring dove brain and to characterize the affinity, capacity, specificity, and in vivo saturability of ¹²⁵I-ovine PRL binding in individual brain regions. Significant specific binding was detected in choroid plexus and in a variety of forebrain and midbrain sites, with highest levels observed in the preoptic area, tuberoinfundibular region, lateral hypothalamic area, and the suprachiasmatic, paraventricular, and ventromedial hypothalamic nuclei. A comparison of PRL receptors in the choroid plexus, preoptic area, ventromedial nucleus, suprachiasmatic nucleus, and tuberal hypothalamus revealed significant regional differences in binding capacity, but no differences in binding affinity (K_d = 0.4-0.9 nM; B_max = 6-14 fmol/mg protein). Unlabelled ovine PRL proved to be an effective competitor of labelled ovine PRL at concentrations of 43 pM, 0.43 nM, and 4.3 nM in the choroid plexus and in 5 diencephalic areas. In contrast, no significant competition was observed in any of these brain areas in tests with unlabelled turkey GH, ovine GH, or ovine LH at similar concentrations. Unlabelled ovine PRL (37 nmol) significantly reduced the uptake of ¹²⁵I-ovine PRL (37 pmol) in the preoptic area, tuberal hypothalamus, and bed nucleus of the pallial commissure at 2 h after intravenous injection. In addition, specific binding of ¹²⁵I-ovine PRL in vitro was reduced by over 67% in these brain areas and in several other brain regions following a 7 day period of systemic ovine PRL administration. These results indicate that PRL receptors in different regions of the dove brain exhibit similar binding characteristics. In addition, they suggest that at least some of these PRL-sensitive brain loci are accessible to blood-borne hormone.

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“…Similarly to mammals, poultry also have taste buds (Kare et al, 1976) and are capable of differentiating the flavor of different chemical solutions, although behavioral effects are not evident (Denbow, 1985). Changes in diet composition, such as drug inclusion and excessive mineral content, could result in changes in the taste buds, and therefore directly influence poultry intake activities (Denbow, 1985).…”

Section: Introductionmentioning

confidence: 99%

“…Changes in diet composition, such as drug inclusion and excessive mineral content, could result in changes in the taste buds, and therefore directly influence poultry intake activities (Denbow, 1985).…”

Section: Introductionmentioning

confidence: 99%

Use of nicarbazin, salinomycin and zinc oxide as alternative molting methods for commercial laying hens

Domingues

Sgavioli

Praes

et al. 2014

Rev. Bras. Cienc. Avic.

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An experiment was carried out to evaluate the performance, egg quality and morphometry of the reproductive tract, liver, pancreas and tongue of laying hens submitted to different molting methods. Two hundred and eighty eight 72-week-old Isa brown layers were distributed according to a completely randomized design with six treatments (molting methods) and six replicates of eight birds each. Layers were fed diets containing 3000 ppm zinc oxide, 60 ppm or 120 ppm nicarbazin, 30 ppm or 60 ppm salinomycin, or were submitted to feed fasting. Data were submitted to analysis of variance and means were compared by the test of Tukey at 5% probability level. Molting methods alternative to feed fasting were effective to induce molting in layer and provided good performance results in the second laying cycle.

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Food intake control in birds

Cited by 42 publications

References 145 publications

The regulation of stearoyl-CoA desaturase gene expression is tissue specific in chickens

The regulation of stearoyl-CoA desaturase gene expression is tissue specific in chickens

Prolactin Receptors in Dove Brain: Autoradiographic Analysis of Binding Characteristics in Discrete Brain Regions and Accessibility to Blood-Borne Prolactin

Use of nicarbazin, salinomycin and zinc oxide as alternative molting methods for commercial laying hens

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