ArticleThe ability of pigs to control their protein intake when fed in three different ways
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Live black soldier fly larvae (Hermetia illucens) provisioning is a promising environmental enrichment for pigs as indicated by feed- and enrichment-preference tests
2021, Applied Animal Behaviour ScienceCitation Excerpt :It is possible that long-term nutritional consequences for the pigs may have played a role, although with the current set-up this is unlikely. Kyriazakis et al. (1991) claimed that pigs adapted their feed intake to the nutritional composition of the diet only when they had sufficient time to experience the nutritional consequences. Pigs may have experienced the nutritional consequences of consuming the feed items during the first week of habituation in T1 and T2, when each item was available throughout one day.
Taste, teleology and macronutrient intake
2021, Current Opinion in PhysiologyCitation Excerpt :However, the importance of taste in this regard is questionable. Some evidence suggests taste alone allows rapid identification of dietary protein sources in protein-depleted rats [24], but the preponderance of evidence indicates selection in rodents and other animals depends on post-ingestive learning where the sensory signal only acquires predictive power based on an association with a corrective post-ingestive outcome [25,26]. Second, a number of essential amino acids are effective taste stimuli, but a number of these elicit unpleasant sensations (e.g. methionine, leucine, tryptophan) and render protein hydrolysates unpalatable.
Influence of mild feed restriction and mild reduction in dietary amino acid content on feeding behaviour of group-housed growing pigs
2018, Applied Animal Behaviour ScienceCitation Excerpt :Other studies found that mild deficiencies in protein, lysine or threonine resulted in increased feed intake (Ferguson and Gous, 1997; Henry, 1995; Chiba et al., 2002). Moreover, Kyriazakis et al. (1991) showed that pigs were able to control their protein intake when they had free access to feeds with differing protein contents. In this regard, reduced levels of tryptophan in the diet increased the feeding activities of pigs under AL conditions (Dalcin Castilha et al., 2016), and a similar effect was observed by Jensen et al. (1993) as a consequence of dietary CP restriction.
Where and what to feed? Differential effects on fecundity and longevity in the invasive Drosophila suzukii
2017, Basic and Applied EcologyCitation Excerpt :Initially focusing on the energy intake for an individual (optimal foraging theory, MacArthur & Pianka 1966; Ydenberg, Welham, Schmid-Hempel, Schmid-Hempel, & Beauchamp 1994; Raubenheimer et al. 2009), studies on nutrition have shifted toward a more realistic approach, taking into account the nutrient composition of food and that animals must optimize their food intake of both energetic macronutrients (carbohydrates, proteins, lipids) and/or non-energetic nutrients (water, mineral salts, vitamins, antioxidants). Dealing with the multi-dimensionality of food sources, some species are able to regulate their intake of food to reach an optimal ratio of nutrient intake (Fanson, Yap, & Taylor 2012; Kyriazakis, Emmans, & Whittemore 1991; Lee et al. 2008; Raubenheimer & Simpson 1997; see Behmer (2009) for review of insect herbivores). In insects, the decision to select a specific resource depends on factors such as nutritional status, previous feeding experience, mating status, and egg load in the ovary (Behmer 2009; Jervis, Ellers, & Harvey 2008; Minkenberg, Tatar, & Rosenheim 1992).