The tannin content of rapeseed meals

Fenwick, Roger; Hoggan, Shelagh A.

doi:10.1080/00071667608416250

Cited by 44 publications

(15 citation statements)

References 9 publications

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“…The values were slightly higher than those reported for free phenolics present in canola/rapeseed (1.5 to 1.8%; Kozlowska et al, 1990). However, the current values were similar to those reported by Fenwick and Hoggan (1976).…”

Section: Quality Characteristics Of Yellow-seeded Brassica Seed Mealssupporting

confidence: 63%

Developments in the breeding of low fibre rapeseed/canola

Slominski¹

1997

J. Anim. Feed Sci.

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Evaluation of the nutritive profiles of the meals derived from yellow-seeded Brassica napus, B.rapa, B.juncea carinata and Sinapis alba genotypes (27 samples) and conventional brown-seeded canola (7 samples) was undertaken. On average, in comparison to brown-seeded, yellow seeded types contained more sucrose (8.7 vs 7.5%) and protein (44.5 vs 42.7%) but similar amouns of oligosaccharides (2.3 vs 2.5%), ash (6.9 vs 7.0%), a nonstarch polysaccaharides (20.4 vs 19.7%). Total dietary fibre averaged 28% for yellow-seeded samples and 33% for brown-seeded samples and was negatively correlated (r = -0.71) with protein content. The negative relationship between protein and dietary fibre contents was also evident for the sample of conventional canola grown under different environment conditions. An in vitro digestible protein measurement was used to establish optimal conditions for the processing of canola seed. Digestible protein content of three oil free seed samples increased substantially with increased temperature of moist heat treatment up to 108±1°C. Heat treatment below 105°C was not effective in promoting protein digestibility. Application of higher temperatures (> 110°C) resulted in a significant decline in protein digestibility. The optimal moist heat treatment conditions were chosen for processing of the seed samples selected for further evaluation in vivo. The samples included the yellow-seeded B. napus, B.juncea and B. rapa and the brown-seed B. napus canola. Availability of energy and amino acids and the overall feeding quality as determined in a 2-week growth trial with 4-day-old broiler chickens were assessed. Two commercial meals from yellow-seeded B. rapa and brown-seeded B. napus canola served as control samples. Availability of amino acids averaged 84.1 % with only minor differences among the samples. True metabolizable energy (AME N ) content was highest in the yellow-seeded B. napus sample. There were no differences in weight gain of broiler chickens fed the commercial or laboratory prepared B. rapa and yellow-and brown-seeded B. napus meals. Chickens fed B.juncea meal showed significantly lower feed intake and body weight gain which appeared to be attributed to a relatively high content of aliphatic glucosinolates in particular meal (i.e., 21.7 /miol/g DM). Birds fed the yellow-seeded B. napus canola showed the highest feed efficiency value which averaged 1.51 and differed significantly from that of 1.59 and 1.61 for the commercial yellow-seeded B. rapa and the laboratory

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Section: Quality Characteristics Of Yellow-seeded Brassica Seed Mealssupporting

confidence: 63%

Developments in the breeding of low fibre rapeseed/canola

Slominski¹

1997

J. Anim. Feed Sci.

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“…The tannin content was low in both meals (cf. Fenwick and Hoggan 1976) and could not explain the great difference between digestibilities. Furthermore, the Span-Torch meal was ground more finely than the Candle meal, which was of medium coarseness.…”

Section: Resultsmentioning

confidence: 99%

Nutritive value of rapeseed meal from two Brassica campestris varieties for growing pigs

Salo

1980

AFSci

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Abstract. The digestibility and nutritive value of two rapeseed meals (Brassica campestris) , one prepared from the mediurn-glucosinolate varieties Span and Torch, and the other from a low-glucosinolate variety Candle, were determined for three pigs weighing about 45 kg. The pigs received 1 600 g barley and 600 g rapeseed meal daily.The composition of the Candle meal was better than that of Span-Torch and its digestibility and nutritive value higher (P < 0.01). When the fat content of Candle meal was corrected to the 1.5 % level of Span-Torch meal, the ME values were 13.6 and 10.4 MJ/kg DM, the NE values 1.01 and 0.78 FU/kg DM (FU = 0.7 kg starch), and the DCP values 318 and 248 g DCP/kg DM for Candle and Span-Torch, respectively (P < 0.01). The difference in the nitrogen balance was also significant (P < 0.01). Thus the Candle meal has about 30 % higher nutritive value for pigs than the SpanTorch meal.

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“…Clandinin and Heard (1968) reported the presence of approximately 3% tannins in the rapeseed meal as assayed by the method for tannin determination in cloves and allspice. However, Fenwick and Hoggan (1976) showed that this value included sinapine (up to 1.5%). Thus, the tannin concentrations were actually 18-45% lower than those reponed by Clandinin and Heard (1 968).…”

Section: Condensed Tanninsmentioning

confidence: 99%