Low-Fiber Canola. Part 1. Chemical and Nutritive Composition of the Meal

Abstract

The objective of the current study was to evaluate the chemical and nutritive composition of meals derived from a newly developed yellow-seeded Brassica napus canola and the canola-quality Brassica juncea . In comparison with its conventional black-seeded counterpart, meal derived from yellow-seeded B. napus canola contained more protein (49.8 vs 43.8% DM), more sucrose (10.2 vs 8.8% DM), and less total dietary fiber (24.1 vs 30.1% DM). B. juncea canola showed intermediate levels of protein, sucrose, and dietary fiber (47.4, 9.2, and 25.8%, respectively). The reduction in fiber content of yellow-seeded B. napus canola was a consequence of a bigger seed size, a lower contribution of the hull fraction to the total seed mass, and a lower content of lignin with associated polyphenols of the hull fraction. The meal derived from yellow-seeded B. napus canola would appear to have quality characteristics superior to those from black-seeded B. napus or yellow-seeded B. juncea.

In vitro digestion and fermentation characteristics of canola co-products simulate their digestion in the pig intestine

“…The JSECM contained less fibre than NSECM because Juncea canola seed has a thinner seed coat than Napus canola seed (Slominski et al, 2012). The greater IVDDM for JSECM than NSECM was likely due to the lower fibre content of JSECM than NSECM.…”

“…The JSECM and NSECM are similar in non-starch polysaccharide content (Slominski et al, 2012). However, NSECM contains more lignin and associated polyphenols than JSECM (7.1% and 3.9%, respectively; Slominski et al, 2012), leading to more total fibre in NSECM than JSECM. Fibre fermentation is reduced with increased fibre lignification (Van Soest, 1994).…”

“…Fibre is indigestible by pepsin and pancreatic enzymes; hence, the undigested residues of feedstuffs after in vitro digestion are rich in fibre (Jha et al, 2011). The JSECM and NSECM are similar in non-starch polysaccharide content (Slominski et al, 2012). However, NSECM contains more lignin and associated polyphenols than JSECM (7.1% and 3.9%, respectively; Slominski et al, 2012), leading to more total fibre in NSECM than JSECM.…”

“…Notably, the fractional rate of degradation was greater for NSECM, NEPCM or NCPCC than for JSECM likely due to more readily fermentable nutrients in B. napus than in B. juncea co-products that did escape in vitro digestion due to the greater content of tannins in B. napus than in B. juncea co-products. The B. napus co-products contain more polyphenols including tannins than B. juncea co-products (Slominski et al, 2012). In addition, fibre in B. napus co-products such as NSECM, NEPCM and NCPCC is more lignified and hence less fermented than fibre in B. juncea co-products such as JSECM (Slominski et al, 2012).…”

“…The B. napus co-products contain more polyphenols including tannins than B. juncea co-products (Slominski et al, 2012). In addition, fibre in B. napus co-products such as NSECM, NEPCM and NCPCC is more lignified and hence less fermented than fibre in B. juncea co-products such as JSECM (Slominski et al, 2012). Thus, the negative correlation between rate of degradation and fermentation could be attributed to a greater fractional rate of degradation for feedstuffs that contained more lignified fibre.…”