Physiological Factors Depressing Feed Intake and Saliva Secretion in Goats Fed on Dry Forage

Sunagawa, Katsunori; Ooshiro, T.; Nakamura, Naoki; Ishii, Yasuyuki; Nagamine, Itsuki; Shinjo, Akihisa

doi:10.5713/ajas.2007.60

Cited by 13 publications

(19 citation statements)

References 24 publications

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“…It is, therefore, thought that the slow increases in plasma osmolarity observed in large-type goats fed dry forage with free access to water were due to the continuous absorption of Na and Cl from the rumen (Stacy and Warner 1966;Warner and Stacy 1972). The plasma Cl and K concentrations in the ASI-treated groups were significantly lower than those of the NI controls, likely because the Cl and K concentrations in the artificial saliva infused in the experimental treatment were lower than the concentrations that naturally occur in plasma (Sunagawa et al 2007b).…”

Section: Plasma Glucose Concentrationmentioning

confidence: 94%

“…The reason for this is thought to be an increase in the amount of electrolytes infused. When hypo-osmotic artificial saliva with an osmolarity similar to that of mixed saliva or iso-osmotic artificial saliva with an osmolarity similar to that of parotid saliva was intravenously infused into large-type goats, parotid saliva secretion volumes increased (Sunagawa et al 2005(Sunagawa et al , 2007b. It is thought that salivary secretion volume in the ASI-treated goats was higher than in the NI controls, since the plasma volume in the ASI-treated goats was significantly higher than in the NI controls (Sunagawa et al 2007b).…”

Section: Plasma Glucose Concentrationmentioning

confidence: 99%

“…(1 after the commencement of feeding (Sunagawa et al 2007b). The high NaHCO 3 content in ruminant saliva acts as a buffer for the ruminal fluid, thus assisting in maintaining continuous fermentation.…”

Section: Plasma Glucose Concentrationmentioning

confidence: 99%

“…Parotid saliva secretion volumes in ruminants contribute 50 to 70% of the total mixed saliva secretion volumes (Tsuda et al 1994). Up to this point, Sunagawa et al (2001Sunagawa et al ( , 2005Sunagawa et al ( , 2007b have intravenously infused animals continuously with hypo-osmotic and iso-osomotic artificial saliva beginning 1 h prior to the commencement of feeding. Plasma osmolarities during infusion were comparatively low or equal to non-infusion values.…”

Section: Plasma Glucose Concentrationmentioning

confidence: 99%

“…Daily total mixed saliva secretion Abbreviations: ASI, artificial parotid saliva i.v. infusion; NI, control treatment volumes are 6 to 16 L in sheep (Kay 1960), 11 to 17 L in goats (Sunagawa et al 2005(Sunagawa et al , 2007b, and 98 to 255 L in cattle (Bailey 1961;Maekawa 2002a, b). Parotid saliva secretion volumes in ruminants contribute 50 to 70% of the total mixed saliva secretion volumes (Tsuda 1994).…”

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confidence: 99%

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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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Section: Plasma Glucose Concentrationmentioning

confidence: 94%

Section: Plasma Glucose Concentrationmentioning

confidence: 99%

Section: Plasma Glucose Concentrationmentioning

confidence: 99%

Section: Plasma Glucose Concentrationmentioning

confidence: 99%

mentioning

confidence: 99%

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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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Accuracy comparison of dry matter intake prediction models evaluated by a feeding trial of lactating dairy cows fed two total mixed rations with different forage source

Pan

Yang

Beckers

et al. 2017

Journal of Integrative Agriculture

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Dry matter intake (DMI) prediction models of NRC (2001), Fox et al. (2004) and Fuentes-Pila et al. (2003) were targeted in the present study, and the objective was to evaluate their prediction accuracy with feeding trial data of 32 lactating Holstein cows fed two total mixed rations with different forage source. Thirty-two cows were randomly assigned to one of two total mixed ration groups: a ration containing a mixed forage (MF) of 3.7% Chinese wildrye, 28.4% alfalfa hay and 26.5% corn silage diet and another ration containing 33.8% corn stover (CS) as unique forage source. The actual DMI was greater in MF group than in CS group (P=0.064). The NRC model to predict DMI resulted in the lowest root mean square prediction error for both MF and CS groups (1.09 kg d-1 vs. 1.28 kg d-1) and the highest accuracy and precision based on concordance correlation coefficient for both MF and CS diet (0.89 vs. 0.87). Except the NRC model, the other two models presented mean and linear biases in both MF and CS diets when prediction residuals were plotted against predicted DMI values (P<0.001). The DMI variation in MF was caused by week of lactation (55.6%), milk yield (13.9%), milk fat percentage (7.1%) and dietary neutral detergent fiber (13.3%), while the variation in CS was caused by week of lactation (50.9%), live body weight (28.2%), milk yield (8.4%), milk fat percentage (5.2%) and dietary neutral detergent fibre (3.8%). In a brief, the NRC model to predict DMI is comparatively acceptable for lactating dairy cows fed two total mixed rations with different forage source.

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The Physiological Suppressing Factors of Dry Forage Intake and the Cause of Water Intake Following Dry Forage Feeding in Goats — A Review

Sunagawa

Nagamine

2015

Asian Australas. J. Anim. Sci

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The goats raised in the barn are usually fed on fresh grass. As dry forage can be stored for long periods in large amounts, dry forage feeding makes it possible to feed large numbers of goats in barns. This review explains the physiological factors involved in suppressing dry forage intake and the cause of drinking following dry forage feeding. Ruminants consume an enormous amount of dry forage in a short time. Eating rates of dry forage rapidly decreased in the first 40 min of feeding and subsequently declined gradually to low states in the remaining time of the feeding period. Saliva in large-type goats is secreted in large volume during the first hour after the commencement of dry forage feeding. It was elucidated that the marked suppression of dry forage intake during the first hour was caused by a feeding-induced hypovolemia and the loss of NaHCO3 due to excessive salivation during the initial stages of dry forage feeding. On the other hand, it was indicated that the marked decrease in feed intake observed in the second hour of the 2 h feeding period was related to ruminal distension caused by the feed consumed and the copious amount of saliva secreted during dry forage feeding. In addition, results indicate that the marked decreases in dry forage intake after 40 min of feeding are caused by increases in plasma osmolality and subsequent thirst sensations produced by dry forage feeding. After 40 min of the 2 h dry forage feeding period, the feed salt content is absorbed into the rumen and plasma osmolality increases. The combined effects of ruminal distension and increased plasma osmolality accounted for 77.6% of the suppression of dry forage intake 40 min after the start of dry forage feeding. The results indicate that ruminal distension and increased plasma osmolality are the main physiological factors in suppression of dry forage intake in large-type goats. There was very little drinking behavior observed during the first hour of the 2 h feeding period most water consumption occurring in the second hour. The cause of this thirst sensation during the second hour of dry forage feeding period was not hypovolemia brought about by excessive salivation, but rather increases in plasma osmolality due to the ruminal absorption of salt from the consumed feed. This suggests the water intake following dry forage feeding is determined by the level of salt content in the feed.

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Physiological Factors Depressing Feed Intake and Saliva Secretion in Goats Fed on Dry Forage

Cited by 13 publications

References 24 publications

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

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

Accuracy comparison of dry matter intake prediction models evaluated by a feeding trial of lactating dairy cows fed two total mixed rations with different forage source

The Physiological Suppressing Factors of Dry Forage Intake and the Cause of Water Intake Following Dry Forage Feeding in Goats — A Review

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