Kim et al.

to rapeseed meal. Further, dietary inclusion of canola meal has been reported to

reduce the reliance on soybean meal (Robertson et al. , 2000). Although canola,

i.e., low erucic acid, low glucosinolate rapeseed, is a major oilseed crop, and

CM has been a feedstuff for more than 30 years, knowledge about the feed value

of recently produced CM for weaned pigs is limited. Nutrient availability is an

abstract concept, which cannot be measured but it can be estimated (Sibbald,

1987). However, Studies have suggested that amino acids in swine diets should be

formulated on the basis of true or standardized amino acid digestibility (Nyachoti

et al. , 1997). Thus, mixing ratio for the present experiment was created by applying

the standard ileal digestibility (SID) that has shown good efficiency on swine.

It is known that the efficiency of nutrient and energy digestibility of feed ingredients

in pig diets is usually affected by dietary supplements, there processing methods

(De Vries et al. , 2012) and feeding levels (Noblet and Shi, 1994). It has been

reported that inclusion of 15% CM in the diet has decreased the feed intake by 41

g, feed conversion efficiency by 10% and increased the carcass fat, while inclusion

of 13.2% CM, has decreased the daily gain by 8% and feed conversion efficiency

by 6% with no impact on carcass, meat, or fat quality (Wetscherek et al. , 1990;

1992). In contrast, the present study reported that dietary inclusion of upto 12%

CM had no effect on final BW, ADG, ADFI and FCR of the finishing pigs. Present

findings are consistent with results of Roth-Maier et al. (2004) who reported no

impact of dietary inclusion of canola meal on growth performance and slaughter

data during earlier period (period I+II), however, improved growth in the later

stages of grower period when supplemented with different concentration of canola

meal. This might be due to the use of lower concentration of canola meal and

selective breeding program used for improving the canola variety for reducing

the contents of erucic acid and glucosinolates. Further, some authors indicated

that young pigs are more affected by glucosinolates (Corino et al. , 1991) while

other suggested finishing pigs are more sensitive (Roth-Maier et al. , 2004) but

maximum tolerable level of dietary glucosinolates for weaned pigs is still to be

established.

Among vegetable protein sources, soybean meal is well known due to its best

profile of certain essential amino acids (Cromwell, 1999), whereas, canola meal is

rich in fiber content and contains about three times higher fiber than soybean meal.

It has been reported that feed stuff containing higher fibers reduce the digestibility,

increase endogenous secretions and decrease hydrolysis and absorption of nutrients

(Bell, 1993; Wilfart et al. , 2007) in pigs. Lysine is often the first limiting amino

acid in farm animal feeds (Bell, 1993) but its additional supplementation in the diet

increases its uptake (Schneider et al. , 2010). Ileal lysine digestibility of rapeseed

meal is about 10% lower than that of soybean meal (Sauer and Ozimek, 1986;

CVB, 1991). However, in the present study inclusion of different concentration

of CM has been accompanied with supplementation of crystalline amino acids to

162

Journal of Animal Research: v.4 n.2. Dec. 2014