Phosphorus appetite in sheep: Dissociating taste from postingestive effects1,2

Villalba, Juan J.; Provenza, Frederick D.; Hall, Jeffery O.; Peterson, Chris

doi:10.2527/jas.2005-634

Cited by 19 publications

(9 citation statements)

References 36 publications

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“…Animals are thought to respond to excesses, deficits, or imbalances of nutrients (Villalba et al, 2006). Birds have been shown to possess Ca sensors (T1R3 and Ca sensing receptor), but it is yet to be determined whether they mediate Ca appetite or taste (Tordoff et al, 2008;Roura et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Effect of dietary nonphytate phosphorus and calcium concentration on calcium appetite of broiler chicks

et al. 2014

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The effect of dietary nonphytate P (nPP) and Ca concentration on the Ca appetite in broilers was evaluated. A total of 288 one-day-old male Ross 308 broilers were fed a commercial diet for 7 d then randomly allocated to 1 of 8 dietary treatments for a 28-d study. Diets were corn-soybean meal based and formulated to be nutritionally adequate except for nPP and Ca. Two concentrations of Ca (5.0 and 10.0 g/kg) and 4 of nPP (2.5, 3.5, 4.5, and 5.5 g/kg) were used, and all birds had access to a separate Ca source (CaCO3). Bird performance, nutrient digestibility, and tibia ash were determined. Birds fed 5.0 g of Ca/kg diets consumed more (P < 0.01) of the separate Ca source than birds fed diets containing 10.0 g of Ca/kg. Increased consumption (P < 0.01) of the separate Ca source was associated with increasing nPP concentration. Bird performance was not influenced by dietary treatment. Birds fed 5.5 g of nPP/kg diets had lower (P < 0.01) digestibility of DM, CP, and energy than the other groups. Phosphorus digestibility was reduced in birds fed high Ca diets and those fed 2.5 g of nPP/kg diets (P < 0.001). Birds fed 2.5 g of nPP/kg had lower tibia ash values than those fed higher concentrations of nPP while feeding diets containing 10.0 g of Ca/kg led to higher concentrations (P < 0.05) of tibia ash than for birds fed 5.0 g of Ca/kg. This study confirms previous findings that birds are able to meet their Ca requirement when fed Ca separately from the mixed ration. Consumption of the separate Ca source responded to not only Ca concentration but also to the amount of nPP in the diet. These data suggest that dietary nPP concentration influences the Ca specific appetite of broilers, and this may indicate that birds attempt to regulate their intake of Ca relative to nPP. This may be mediated via a physiological mechanism to maintain an appropriate Ca:nPP intake.

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Section: Discussionmentioning

confidence: 99%

Effect of dietary nonphytate phosphorus and calcium concentration on calcium appetite of broiler chicks

et al. 2014

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“…Thus, animals maintain a balance of energy to protein that meets their nutritional needs, and in the process, they associate different internal states with the ingestion, or lack thereof, of different nutrients (Egan, 1980;Kyriazakis and Oldham, 1993). Likewise, lambs deficient in phosphorus and calcium increase preferences for flavours and supplements that provide those minerals (Villalba et al, 2006a;J. Villalba, unpublished results).…”

Section: Self-medication In Herbivoresmentioning

confidence: 99%

Self-medication and homeostatic behaviour in herbivores: learning about the benefits of nature’s pharmacy

Villalba

Provenza

2007

Animal

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Traditional production systems have viewed animals as homogeneous 'machines' whose nutritional and medicinal needs must be provided in a prescribed manner. This view arose from the lack of belief in the wisdom of the body to meet its physiological needs. Is it possible for herbivores to select diets that meet their needs for nutrients and to write their own prescriptions? Our research suggests it is. Herbivores adapt to the variability of the external environment and to their changing internal needs not only by generating homeostatic physiological responses, but also by operating in the external environment. Under this view, food selection is interpreted as the quest for substances in the external environment that provide homeostatic utility to the internal environment. Most natural landscapes are diverse mixes of plant species that are literally nutrition centres and pharmacies with vast arrays of primary (nutrient) and secondary (pharmaceutical) compounds vital in the nutrition and health of plants and herbivores. Plant-derived alkaloids, terpenes, sesquiterpene lactones and phenolics can benefit herbivores by, for instance, combating internal parasites, controlling populations of fungi and bacteria, and enhancing nutrition. Regrettably, the simplification of agricultural systems to accommodate inexpensive, rapid livestock production, coupled with a view of secondary compounds as toxins, has resulted in selecting for a biochemical balance in forages favouring primary (mainly energy) and nearly eliminating secondary compounds. There is a global need to create a more sustainable agriculture, with less dependence on external finite resources, such as fossil fuels and their environmentally detrimental derivatives. Self-medication has the potential to facilitate the design of sustainable grazing systems to improve the quality of land as well as the health and welfare of animals. Understanding foraging as the dynamic quest to achieve homeostasis will lead to implementing management programs where herbivores have access not only to diverse and nutritious foods but also to arrays of medicinal plants.

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“…The literature has widely reported that sheep can develop conditioned food aversions or preferences when either negative (Du Toit et al, 1991;Ralphs et al, 1995;Kyriazakis et al, 1997) or positive (Buritt and Provenza, 1992;Arsenos and Kyriazakis, 1999;Villalba et al, 2006) post-ingestive consequences are associated with that food. Recently, introduction of straw in the rumen (Baumont et al, 2007) or distension with a balloon (Villalba et al, 2009a and2009b) were used to demonstrate that rumen fill is perceived as a negative post-ingestive signal, leading to a decreased preference for the associated forage.…”

Section: Short-term Choices: Effect Of Recent Dietary Experiencesmentioning

confidence: 99%

Feeding behaviour of sheep fed lucerne v. grass hays with controlled post-ingestive consequences

Favreau

Ginane

Baumont

2010

Animal

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Understanding what determines feeding behaviour in herbivores is essential to optimise the use of forages in breeding systems. Herbivores can evaluate foods by associative learning of their pre-ingestive characteristics (taste, odour, etc.) and their postingestive consequences. Post-ingestive consequences are acknowledged as influencing intake and food choices, but the role of pre-ingestive characteristics is still being debated. Our experiment was designed to test their separate effects on daily dry matter intake (DMI), intake patterns and short-term choices in sheep by crossing the nature of the hay orally consumed (o) ad libitum, lucerne (L) or grass (G), with the nature of the hay introduced into the rumen (r), L or G, at a rate of half the total amount of hay received the day before. We applied four treatments, Go/Gr, Go/Lr, Lo/Gr and Lo/Lr, to test the effects of (i) post-ingestive consequences with similar pre-ingestive characteristics (Go/Gr v. Go/Lr; Lo/Gr v. Lo/Lr) and (ii) pre-ingestive characteristics with similar post-ingestive consequences at the end of the feeding period (Go/Lr v. Lo/Gr). Six rumen-fistulated sheep underwent all the treatments over 11-day periods in a latin square design. Eating time was restricted to 6 h/day, intraruminal introductions were performed just before food offer and choice tests were conducted after food removal. For similar pre-ingestive characteristics, DMI increased when L hay was introduced into the rumen rather than G ( P , 0.05), possibly owing to a lower fill effect of L due to its lower NDF content and higher rumen degradability. The increased DMI resulted from longer eating time when G was orally consumed (149 v. 192 min, P , 0.05), whereas it resulted from higher intake rate with L (4.8 v. 6.1 g/min, P , 0.05). For similar post-ingestive consequences at the end of the feeding period (Go/Lr and Lo/Gr), DMI were similar ( P . 0.05). Pre-ingestive characteristics or palatability per se did not therefore influence daily intake, although they influenced eating patterns. Pre-ingestive characteristics also greatly influenced short-term choices in favour of the hay that was not previously consumed, independently of any post-ingestive influence. This study confirms the effects of post-ingestive consequences on daily intake, but demonstrates that these variations are obtained by different behavioural adjustments under the influence of pre-ingestive characteristics. Preference for novelty, regardless of post-ingestive consequences, thus suggests that sheep may seek a diverse diet more for pleasure than for functional purposes, with implications for animal welfare.Keywords: feeding behaviour, intake, sensory characteristics, rumen, sheep ImplicationsBreeding systems tend to increase the proportion of forages in the total diet of ruminants, both for economic gain and in response to social demand for environmental protection and welfare. However, their use remains to be optimised. To do this we need a better understanding of how food characteristics influence feeding beh...

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Phosphorus appetite in sheep: Dissociating taste from postingestive effects1,2

Cited by 19 publications

References 36 publications

Effect of dietary nonphytate phosphorus and calcium concentration on calcium appetite of broiler chicks

Effect of dietary nonphytate phosphorus and calcium concentration on calcium appetite of broiler chicks

Self-medication and homeostatic behaviour in herbivores: learning about the benefits of nature’s pharmacy

Feeding behaviour of sheep fed lucerne v. grass hays with controlled post-ingestive consequences

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