Effects of Intraruminal Saliva Flow on Feed Intake in Goats Fed on Alfalfa Hay Cubes

Sunagawa, Katsunori; Nakatsu, Yoshifumi; Nishikubo, Yoriko; Ooshiro, T.; Naitou, Kouta; Nagamine, Itsuki

doi:10.5713/ajas.2002.1738

Cited by 14 publications

(21 citation statements)

References 7 publications

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“…As a result, their feed intake was 45.9% larger than that in non‐infusion treatment, and this increase in feed intake was observed during the first half of the feeding period. The increase in feed intake during the first half of the present experiment corresponds to the results of the experiment conducted by Sunagawa et al . (2002).…”

Section: Discussionsupporting

confidence: 91%

“…The changes in eating rates in this experiment are similar to the results of experiments conducted by Prasetiyono et al . (2000) and Sunagawa et al . (2002) on goats.…”

Section: Discussionmentioning

confidence: 96%

“…Thus, in order to clarify whether the VMH neurons in ruminants play a role as a satiety center, recording neuronal activities in the various conditions of feed intake changes is indispensable. With regard to changes in the feed intake, it is reported that the feed intake in goats increased when an excessive amount of warm water was infused into the rumen (Sunagawa et al . 2002).…”

Section: Introductionmentioning

confidence: 99%

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Changes in single‐unit activity in the ventromedial hypothalamic nucleus of goats during feeding

Nagamine

Sunagawa

Shinjo

2006

Animal Science Journal

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In this study we used a single‐unit activity (SUA) recording electrode to investigate the existence of appetite‐regulating neurons in the ventromedial hypothalamic nucleus (VMH) in goats. Five male Japanese Saanen goats were used. The animals were fed at 10.00 hours with alfalfa hay cubes, and at 16.00 hours with concentrate feed and hay. The animals were allowed free access to drinking water. The present experiment consisted of two treatments, non‐infusion (NI) and an intra‐ruminal water infusion (RWI). The SUA recordings were carried out continuously over a 130 min period beginning 10 min prior to the commencement of morning feeding. In the RWI treatment, warm water was infused intra‐ruminally before the SUA recording. Eating rates in the NI treatment decreased sharply by the time 40 min had elapsed and then remained at low levels. In the RWI treatment, eating rates decreased by the time 50 min had elapsed and then remained at low levels. This study recorded 19 units, of which four units increased their firing rates when the animals became satiated (i.e. when eating rates declined to low levels) in both treatments. The four units were located in the VMH. The results suggest that cells located in the VMH of goats are active in the control of hay intake.

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Section: Discussionsupporting

confidence: 91%

“…The changes in eating rates in this experiment are similar to the results of experiments conducted by Prasetiyono et al . (2000) and Sunagawa et al . (2002) on goats.…”

Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Changes in single‐unit activity in the ventromedial hypothalamic nucleus of goats during feeding

Nagamine

Sunagawa

Shinjo

2006

Animal Science Journal

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“…Intraruminal infusions of hyper-osmotic NaCl, polyethylene glycol-400, sodium acetate, or sodium propionate increase rumen fluid osmolarity and decrease feed intake (Grovum 1995). On the other hand, when the ruminal fluid osmolality was decreased by the intraruminal infusion of an excessive amount of warm water (39.88C) in sheep fed alfalfa hay cubes, feed intake increased 30% (Sunagawa et al 2002). It is thought that the changes in ruminal fluid osmolarity are sensed by the osmoreceptors in the rumen wall and these signals are then transported to the central nervous system affecting feed intake (Leek and Harding 1975).…”

mentioning

confidence: 99%

“…When ruminants commence feeding on dry forage they secrete copious volumes of parotid saliva (Sato 1975;Sunagawa et al 2002Sunagawa et al , 2003, and large amounts of fluid and NaHCO 3 move from the circulating blood into the rumen in the form of saliva. Blair-West and Brook (1969) found that sheep fed lucerne chaff once a day showed a marked reduction in plasma volume within 15 min of the commencement of feeding.…”

mentioning

confidence: 99%

An intravenous replenishment of salivary components decrease water intake and increases feed intake in freely drinking large-type goats fed on dry forage

Sunagawa¹,

Hashimoto²,

Izuno³

et al. 2008

Can. J. Anim. Sci.

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This research utilized two treatments to investigate if feed intake is reduced by changes in humoral factors induced by dry forage feeding in large-type goats given free access to water. In the control treatment (NI), a solution was not infused. The artificial parotid saliva i.v. infusion (ASI) treatment consisted of an i.v. infusion of artificial parotid saliva in order to replenish NaHCO3 and fluids lost from the blood to the rumen due to increased saliva secretion volume during initial stages of dry forage feeding. The ASI treatment significantly mitigated the decreases in circulating plasma volume caused by saliva secretion. Thirst was lower in the ASI-treated group, as indicated by the lower water intake (NI, 3894 mL 2 h-1; ASI, 3100 mL 2 h-1). Decreases with time in dry forage intake were significantly reduced by the ASI treatment (2134g 2 h-1) compared with the NI control (1756 g 2 h-1). These results indicate that under free drinking conditions, dry forage intake of large-type goats may likely be suppressed by the decrease in plasma volume and increase in water intake following saliva secretion during the initial stages of feeding. Key words: Dry forage intake, water intake, large-type goat

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Recent developments in goat nutrition and application: A review

Morand-Fehr

2005

Small Ruminant Research

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Effects of Intraruminal Saliva Flow on Feed Intake in Goats Fed on Alfalfa Hay Cubes

Cited by 14 publications

References 7 publications

Changes in single‐unit activity in the ventromedial hypothalamic nucleus of goats during feeding

Changes in single‐unit activity in the ventromedial hypothalamic nucleus of goats during feeding

An intravenous replenishment of salivary components decrease water intake and increases feed intake in freely drinking large-type goats fed on dry forage

Recent developments in goat nutrition and application: A review

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