Effects of dietary soyabean, rapeseed and linseed oils on performance, slaughter yield and fatty acid profile of breast meat in turkeys

Abstract

The objective of this study was to determine the physiological effect of supplementing turkey diets with different vegetable oils, i.e. soyabean (S) oil, rapeseed (R) oil and linseed (L) oil, which have different concentrations of polyunsaturated fatty acids (PUFA). The total contents of n-6 PUFA and n-3 PUFA were as follows: diet S, 49.7 and 7.02%, diet R, 33.0 and 7.96%, and diet L, 30.3 and 30.6%; the n-6/n-3 PUFA ratio was 7.3, 4.4 and 1.0, respectively. The experimental materials comprised four groups of turkey hens (14 replications of fifteen birds each). The amount of dietary oil supplementation was increased from 2% in the first four weeks to 6% at the final stage of fattening (14-15 weeks). The apparent total tract digestibility of crude fat in 7-week-old turkeys (2.5% oil in diet) ranged from 89.9 to 91.1%, and showed no statistically significant differences. Dressing percentage, breast, thigh, and drumstick muscle contents did not differ among groups. Group L had a significantly higher intestinal fat weight (0.84% body weight (BW)) than the other groups (0.60-0.62%). In comparison with diet S, diets R and L contributed to a significant decrease in the levels of saturated fatty acids (from 32.9% to 30.3 and 30.2%) in breast meat lipids. In group L turkeys, the share of PUFA in total fatty acids in breast meat lipids was significantly higher (37.3% .1% in groups S and R, respectively), and the n-6/n-3 PUFA ratio was significantly lower (1.2 vs 5.6 and 5.1). As for the performance indices (final BW, feed conversion ratio), both rapeseed and linseed oils could be recognized as comparable alternatives to soyabeen oil (in both cases P>0.05 vs S group). However, the highest final BW followed the dietary treatment with linseed oil (P<0.05 vs group R).

Effects of dietary oil sources and calcium : phosphorus levels on growth performance, gut morphology and apparent digestibility of broiler chickens

“…Apparent digestibility of organic matter, crude protein, ether extract and ash was not significantly different (P >0.05) across dietary oil treatments. As observed in the current study, Jankowski et al (2012) found that apparent digestibility of organic matter, ether extract, ash and crude protein was not significantly different in turkeys fed diets supplemented with linseed, rapeseed or soybean oils. In addition, Kavouridou et al (2008) reported that dietary coconut oil, palm oil, olive oil, soybean oil and linseed oil did not influence nitrogen efficiency, but affected fat digestibility.…”

“…Thus, increasing mineral levels and different dietary oil may affect intestinal function. Although some investigations have been conducted on the influence of dietary oil sources and Ca requirement on broiler performance and apparent digestibility (Kavouridou et al, 2008;Jankowski et al, 2012), information on the interaction of dietary oil sources and different levels of Ca is limited. Therefore, the objective of this study was to determine the effects of palm oil, soybean oil and linseed oil with three levels of Ca on growth performance, gut morphology and apparent digestibility in broiler chickens.…”

Effect of dietary pomegranate seed oil and linseed oil on broiler chickens performance and meat fatty acid profile

“…On the other hand, results of previous studies demonstrated that linseed oil (LO) is a good source of ALA and it can be successfully used for enriching poultry meat with n-3 fatty acids, and thus for obtaining more desirable ratio of n-6 to n-3 PUFA. The latter was clearly confirmed for amount of LO supplementation ranging from 1.25 to 5.5% of diet (Jankowski et al, 2012;Chen et al, 2014).…”

Antioxidant status of blood and liver of turkeys fed diets enriched with polyunsaturated fatty acids and fruit pomaces as a source of polyphenols

“…Linseed oil contains significantly less linoleic acid and significantly more linolenic acid than soybean oil (Kavouridou et al 2008, Jankowski et al 2012. In the present study, diets enriched with linseed oil were characterized by a higher linolenic acid content and more than a three-fold lower n-6/n-3 PUFAs ratio.…”