Sites of nutrient digestion in growing pigs: Effect of dietary fiber1

Abstract

The impact of dietary fiber on fecal digestion is well-known and provides a comprehensive approach toward nutrient digestibility and availability. Little quantitative information is available on digestion of fiber in the different segments of the gastrointestinal tract (GIT). The objectives of this study were to obtain a method allowing the quantification of the digestive process in different segments of the GIT and to study the impact of dietary fiber on nutrient digestibility. Six barrows (average initial BW of 30 kg and fitted with a simple T-cannula at the proximal duodenum and caudal ileum) were used in a replicated 3 x 3 Latin square design. In each period, pigs were offered 1 of 3 diets differing in fiber content (low, medium, and high). Differences in fiber content were created by replacing wheat and barley with wheat bran. Titanium dioxide was included in the diet as an indigestible marker to determine the apparent digestibility coefficients in different segments of the GIT. The apparent digestibility of ash, CP, DM, and OM increased in the different segments of the GIT. Duodenal digestibility coefficients were negative for ash (e.g., -39.9% for the medium- and high-fiber diets), indicating important endogenous mineral secretions by the stomach and digestive glands. The duodenal digestibility of other nutrients and OM were positive but close to zero and numerically lower in the diets with the greater fiber contents. The fiber content in the diet did not affect the apparent ileal digestibility of nutrients. Increasing the fiber content in the diet affected the fecal digestibility of CP, ether extract, and energy (P < 0.01). The method used for studying sites of digestion in the digestive tract provides promising results, but it is limited due to the high variability that is likely caused by sampling limitations and variation between animals.

Digestibility and nitrogen balance of pig diets containing gradually increasing levels of rapeseed meal

“…Contrary were the results of other researchers (Landero et al, 2011;Moset et al, 2012) who observed that the addition of RSM in pigs' diets causes a significant reduction in the digestibility of nutrients, which is attributed to the increase in the proportion of CF in the faeces, and secondly because of increased water retention capability of the CF (Wilfart et al, 2007;Moset et al, 2012). This contradictory result is probably due to the limited feed intake in the present study.…”

“…In particular, the reduction of digestibility of energy potential is attributed to the reduction of digestibility of dry and organic matter of diets (Wilfart et al, 2007) or to the reduction of the digestibility of carbohydrates in diets (Le Gall et al, 2009), due to acidification of the digesta, which results in limited absorption of nutrients of the digesta by the epithelial cells of the intestinal tract (Rainbird et al, 1984). The decreased digestibility of CP and amino acids is possibly attributed to the restriction of their absorption and / or to increased concentration of endogenous N and thus to the loss of amino acids (Mosenthin et al, 1994).…”

“…Improved digestibility of CF is probably due to increased microbial activity, which occurs when consumed diets with high content in CF increases the indigestible quantity of fibrous substrate and other substances that reach the colon (Mellange et al, 1992;He, 2004;Anguita et al, 2006). Contradictory are the results of other researchers (Wilfart et al, 2007), showing that the increase of the level of CF in pig diets causes no positive effect on their digestibility. These results may be due to the different source of origin and content of CF used (Stanogias and Pearce, 1983;deVriesa et al, 2012;Zhang et al, 2013).…”

Effects of different penning conditions, feeding regimens and season on growth and carcass attributes of boars of a selected genetic line

“…The effects of dietary fibre associated with bulkiness, i.e. gut fill, on retention time and nutrient availability are well documented (Shriver et al, 2003;Wilfart et al, 2007). Despite some negative impacts, farmers in tropical areas use fibrous crop by-products and forages extensively as alternatives to expensive cereals in pig diets.…”

Pengaruh Penggunaan Sekam Padi Dalam Ransum Berbasis Limbah Pangan Hotel Kering Terhadap Pertumbuhan Dan Karkas Babi

“…Hal ini sesuai dengan pendapat Jurkonski et al (2008) yang menyatakan bahwa partikel serat umumnya memiliki gugus penukar ion kation yang memiliki kemampuan seperti matriks spons untuk mengikat partikel lemak dengan ikatan intraluminal. Hasil ini sesuai dengan yang pernah dilaporkan oleh Wilfart et al (2007), bahwa peningkatan konsentrasi serat dalam ransum menyebabkan peningkatan kandungan ekstrak ether feses ternak babi.…”