Growth performance, carcass characteristics and pork quality of pigs fed diets containing meal from conventional or glyphosate-tolerant canola

Abstract

R. 2007. Growth performance, carcass characteristics and pork quality of pigs receiving diets containing meal from conventional or glyphosate-tolerant canola. Can. J. Anim. Sci. 87: 517-526. Growth performance, carcass characteristics and pork quality were evaluated for pigs fed barley and wheat-based diets, which included meal from conventional or transgenic glyphosatetolerant (Roundup-Ready ® ) canola. One hundred and forty-four pigs (72 gilts and 72 barrows) weighing 30 ± 3 kg were assigned, three to a pen, on the basis of gender and weight to receive one of four dietary treatments formulated using canola meal from two commercial sources (COM1 and COM2), non-transgenic parental control (PCC) or transgenic (RRC) canola. Pigs were fed a grower diet (75 g kg -1 canola meal) until 60.5 ± 4.0 kg and then a finishing diet (150 g kg -1 canola meal) to 108.6 ± 7.3 kg at slaughter. Pigs receiving the COM1 and COM2 diets had an overall higher (P < 0.0001) daily feed intake (DFI) compared with pigs fed the PCC and RRC diets. Corresponding average daily gain (ADG) was also increased (P = 0.02) for COM1-fed pigs, although feed conversion efficiencies (FCE) of the pigs were similar (P > 0.05) among diets. Gilts had lower overall DFI (P < 0.0001), ADG (P < 0.0001) and FCE (P = 0.04) compared with barrows. Pigs receiving the PCC and RRC diets had heavier (P = 0.002) liver weights than those pigs fed the COM1 and COM2 diets (2.06 and 2.05 kg vs. 1.95 and 1.96 kg, respectively). Postmortem decline in pH and temperature of the longissimus thoracis (LT) muscle from pigs were not different (P > 0.05) among the dietary treatments. Characteristics of pork quality for the LT muscle, which included objective colour and shear force were also not affected (P > 0.05) by dietary source of canola meal. Gross composition of commercial pork cuts were similar (P > 0.05) among the dietary treatments with the exception of small differences for intermuscular (P = 0.04) and body cavity (P = 0.02) fat in the picnic cut and body cavity (P = 0.02) fat in the loin cut. Differences in DFI, ADG and liver weights of the pigs may be related to higher content of antinutritional glucosinolates (µmoles g -1 ) in the PCC (20.20) and RRC (15.04) varieties compared with COM1 (7.55) and COM2 (7.46) sources of canola meal.Key words: Transgenic canola, growth, pork quality, pigs Caine, W. R., Aalhus, J. L., Dugan, M. E. R., Lien, K. A., Larsen, I. L., Costello, F., McAllister, T. A., Stanford, K. et Sharma, R. 2007. Croissance, paramètres de la carcasse et qualité de la viande des porcs nourris de tourteau de canola ordinaire ou tolérant le glyphosate. Can. J. Anim. Sci. 87: 517-526. Les auteurs ont évalué la croissance, les paramètres de la carcasse et la qualité de la viande de porcs nourris avec un aliment à base d'orge et de blé enrichi de tourteau de canola ordinaire ou transgénique tolérant le glyphosate (Roundup-Ready ® ). Cent quarante-quatre porcs (72 truies nullipares et 72 castrats) de 30 ± 3 kg ont été répartis à raison de trois par enclos selon le ...

Effects of pork differentiation strategies in Canada on pig performance and carcass characteristics

“…Carcasses from Lacombe crossbred pigs, although not as lean as those from Duroc crossbred animals, showed acceptable yield percentages. The lack of effects from the dietary treatments on carcass lean yield is consistent with previous research using similar diets (Caine et al 2007).…”

“…Fatty acid composition has been generally identified as the main factor responsible for fat hardness (Soladoye et al 2015). Thus, the lower hardness scores observed in carcasses from animals fed the experimental diets (canola and flax) can be explained by the increase in dietary mono-and poly-unsaturated fatty acids (Miller et al 1990;Dugan et al 2001;Caine et al 2007;Juárez et al 2010). Thicker backfat, as observed in heavy carcasses and carcasses from Iberiancrossed pigs, usually leads to higher fat hardness scores, while leaner carcasses have softer fat (Wood and Riley 1982).…”

“…Although the impact of marbling scores on pork palatability is not consistent among studies (Ngapo and Gariépy 2008), marbling is one of the main attributes considered by the industry to classify based on quality. The inclusion of flax and canola in the diet may lead to changes in marbling scores (Dugan et al 2001;Caine et al 2007). However, these effects have been reported with dietary levels well above those used in this study.…”

“…Pig carcass merit traits usually include composition (yield of lean, fat, and bone), percentage of primal cuts, meat pH value, marbling score, and colour (Marcoux et al 2007;Ngapo and Gariépy 2008;Uttaro and Zawadski 2010). All these traits have been reported to be influenced by factors such as breed (Sellier 1976;Gispert et al 2007;Straadt et al 2013), diet (Dugan et al 2001;Thacker et al 2004;Caine et al 2007), slaughter weight (Martin et al 1980;Latorre et al 2004), and chilling regime (Jones et al 1988;Springer et al 2003;Juárez et al 2009). Understanding the potential impact of manipulating each factor, as well as their interactions, would allow the Canadian pork industry to develop differentiated value-added products for a highly competitive market.…”

Scientific Opinion on applications (EFSA-GMO-RX-GT73) for renewal of the authorisation for continued marketing of existing (1) food and food ingredients produced from oilseed rape GT73; and of (2) feed materials, feed additives and food additives produced

“…A published swine feeding study, in which swine received diets containing 15% meal derived from GM oilseed rape GT73, its control or two commercial reference oilseed rape lines, did not indicate any impact of the genetic modification on animal performance (Caine et al, 2007). This study, therefore, provides further confirmation of previous findings of the EFSA GMO Panel on the nutritional equivalence of oilseed rape GT73 to non-GM counterparts (EFSA, 2004).…”