Ionostatic Control of Food Intake in the Domestic Fowl

Abstract

It has been suggested that there is ionostatic control of food intake in which calcium, acting in the hypothalamus, alters food intake. This study was conducted to determine the effects of intracerebroventricular (ICV) injections of calcium on food and water intake in both broiler and Leghorn cockerels. The ICV injection of 50, 100, or 150 mM CaCl2 had no significant affect on food or water intake in Leghorn cockerels. In broilers, the ICV injection of 50 mM CaCl2 significantly increased food intake. This effect appeared to be due to Ca++ as equivalent amounts of Cl- given as NaCl had no effect on food intake nor did isosmotic solutions of NaCl. The effect of Ca++ on water intake in broilers is equivocal as it increased water intake in one experiment while decreasing it in another. Whereas these results support the hypothesis of a role for calcium in food intake regulation in broilers, they do not support the existence of a specific ionostatic control mechanism.

The Role of Experience in the Development of Selective Zinc Intake in Pullets

“…Recent results support the hypothesis of a role for minerals in food intake regulation in poultry, however they do not support the existence of a specific ionostatic mechanism (DENBOW & VAN KREY, 1987). The relationship between dietary selection and physiologi cal need may arise through two mechanisms.…”

Complexo multienzimático na dieta das galinhas poedeiras

“…Nos períodos segundo (28 a 56 dias), terceiro (56 a 84 dias) e quarto (84 a 112 dias) houve efeito significativo do contraste entre controle positivo e controle negativo + 350 g tonelada -1 de inclusão do complexo enzimático, com maior consumo observado em aves recebendo a ração controle negativo suplementada com o complexo & VAN KREY 1987). MURAKAMI et al (2007) também obtiveram resultados semelhantes ao utilizar um complexo com as enzimas protease, celulase e amilase, com um controle positivo e os demais tratamentos com 5% de redução de nutrientes sugeridos para a linhagem utilizada com suplementação com complexo enzimático nos níveis de 400 e 500 ppm.…”

Selektive Futteraufnahme von Broilern bei Zinkmangel

“…Neben den bekannten Theorien zur Verzehrsregulation wird in diesem Zusammenhang von einer ionostatischen Kontrolle der Nahrungsaufnahme gesprochen (MYERS und VEALE 1971). Neuere Untersuchungen stellen jedoch die Existenz eines spezifischen ionostatischen Mechanismus bei domestiziertem Gefliigel in Frage (DENBOW und VAN KREY 1987). In vorliegender Arbeit sollte anhand eines Wahlfutterungsversuchs die Fahigkeit zur selektiven Zinkaufnahme von Jungmasthiihnern uberpriift werden.…”