Growth, carcass characteristics, chemical composition and fatty acid profile of the longissimus dorsi muscle in goat kids fed diets with castor oil

Abstract

The objective in this study was to determine growth, carcass characteristics, chemical composition and fatty acid profile of the longissimus dorsi of crossbred Boer × Saanen kids fed castor oil. Twenty-four kids (12 males and 12 females) were assigned in a randomized complete block design with two treatments and twelve replications. Blocks were defined according to weight, gender and initial age of animals for the evaluation of performance. The experimental treatments consisted of two diets containing 900 g concentrate/kg: a control diet (without addition of oil) and another containing castor oil at 30 g/kg (on a dry matter basis). After they reached an average body weight of 25 kg, males were slaughtered for the evaluation of carcass characteristics, chemical composition and fatty acid profile of the longissimus dorsi muscle. The addition of castor oil in the diet did not affect the intake of dry matter, crude protein and neutral detergent fiber; the average daily gain; and feed conversion, but increased the ether extract intake. No difference was observed for the carcass characteristics, chemical composition of the meat, concentration of C18:2 cis-9, trans-11 (CLA) and total concentration of saturated, monounsaturated and polyunsaturated fatty acids and their relations; however, there was increase in the concentrations of C18:2 trans-10, cis-12 (CLA) and C20:4 ω-6. The addition of castor oil to the diet of crossbred Boer × Saanen kids containing a high content of concentrate did not promote benefit to the characteristics evaluated

Fatty acid composition, cholesterol and antioxidant status of infraspinatus muscle, liver and kidney of goats fed blend of palm oil and canola oil

“…The oil blend used in the current study had no effect on the in vitro (Adeyemi et al 2015a) and in vivo (Adeyemi et al 2015c) ruminal concentration of propionate and this could be responsible for the similarity in the intramuscular fat across the treatments. The current finding is similar to the insignificant deposition of intramuscular fat observed when castor oil (Maia et al 2012) and sunflower oil (Marinova et al 2001) were supplemented in goats' diets.…”

New insights on the metabolism of ricinoleic acid in ruminants

“…Ricinoleic acid is known to have antimicrobial properties (Novak et al, 1961); thus, it has been studied as a possible modulator of ruminal fermentation to be used as an alternative to ionophore additives to improve growth, feed intake, and efficiency. Indeed, inclusion of castor oil in diet of dairy cows (Gandra et al, 2014;de Jesus et al, 2016), bulls (Cruz et al, 2014;Silva et al, 2014), steers (Gandra et al, 2012), sheep (Maia et al, 2012a), or goat kids (Maia et al, 2012b) did not impair nutrient intake, digestibility, or growth performance.…”

“…However, in both studies the FA profile was limited and none of these studies identified the ricinoleic acid or other hydroxy-FA derivatives in muscle. Only Maia et al (2012b) identified low quantities of ricinoleic acid in muscle of goat kids fed diets supplemented with 3% of castor oil. More scarce are the studies on the effects of castor oil on milk FA composition.…”

Effects of supplementation with vegetable oils, including castor oil, on milk production of ewes and on growth of their lambs1

“…Castor oil is unique due to a very high proportion of ricinoleic acid (12-OH,c9-18:1) and is usually considered as nonedible (Severino et al, 2012). Nevertheless, Brazilian research have demonstrated that castor oil can be incorporated in the diet of small ruminants without any deleterious effects on digestion (Maia et al, 2012a), growth (Maia et al, 2012b), and milk production (Queiroga et al, 2010). Moreover, castor oil is less prone to oxidative degradation than other vegetable oil ensuring longer conservation in tropical farm conditions (Medeiros et al, 2013b).…”