TwitterLinkedinWhatsAppTelegramTelegram
0

Digestion rate of dietary starch affects systemic circulation of amino acids in weaned pigs

High level of rapidly digestible starch allows higher systemic circulating concentrations of most AA in pigs.
20 August 2010
TwitterLinkedinWhatsAppTelegramTelegram
0
It was hypothesised that if pigs consumed their meals every 4 h, and six times within 24 h, higher blood metabolite levels would be obtained, as well as better growth performance. The objectives of the present study were to determine the digestibility of starch by in vitro and in vivo methods, and to evaluate the postprandial systemic circulating levels of blood metabolites (mainly AA) in pigs under a ‘six time intake per day’ feeding procedure.

Therefore a total of eighteen weanling pigs surgically fitted with a catheter in the jugular vein were randomly assigned to three dietary treatment groups. Sticky rice starch (SRS) was hydrolysed more quickly in vitro (P<0.05) than maize starch (MS) and resistant starch (RS), and was almost completely hydrolysed within 4 h.

The in vivo digestibility of dietary starch in different segments of the small intestine was significantly different. SRS was digested (81.9 %; P<0.05) in the anterior jejunum, but not more than half of the MS and RS was digested in the same segment of the small intestine. The digestibilities of isoleucine, leucine, methionine, phenylalanine, threonine, tryptophan, valine, alanine, aspartate and serine in the SRS group were higher than in the MS group (P<0.05), and all nutritionally indispensable and dispensable AA in the SRS group were higher when compared with those in the RS group (P<0.05). The serum concentrations of nutritionally indispensable AA, proline and serine in the three groups were increased to a peak point within 1.5 h postprandially then decreased gradually; however, the time that serum concentrations of alanine, aspartate, glutamate and glycine in each group increased to a peak point was different. The concentrations of nutritionally indispensable AA, including arginine, cystine, histidine, isoleucine, leucine, methionine, phenylalanine, threonine, tryptophan, tyrosine and valine at 09.30 hours and arginine, cystine, histidine, isoleucine, methionine, phenylalanine, threonine, tryptophan, tyrosine and valine at 13.30 hours in the SRS group were higher than in the MS group (P<0.05); all nutritionally indispensable AA in the SRS group were higher than in the RS group at 09.30 and 13.30 hours (P<0.05), respectively.

We conclude that dietary starches digested rapidly in vitro have higher digestibility in the anterior small intestine of pigs. Diets containing rapidly digestible starch ameliorate the digestive and absorptive function and regulate AA metabolism to beneficially increase the entry of dietary AA into the systemic circulation in pigs.

F Yin, Z Zhang, J Huang and Y Yin, 2009. British Journal of Nutrition, 103, 1404–1412.

Article Comments

This area is not intended to be a place to consult authors about their articles, but rather a place for open discussion among pig333.com users.
Leave a new Comment

Access restricted to 333 users. In order to post a comment you must be logged in.

Related articles