Fatty acid profile of adipose tissue and performance of feedlot steers supplemented with dehulled cottonseed and sunflower seed meal protected from ruminal metabolism

Abstract

The effect of feeding dehulled cottonseed protected from ruminal metabolism (PCS). Together with supplements of protected sunflower seed meal (PSM), on the performance and fatty acid profile of adipose tissue in feedlot steers was examined. Sixty-two Hereford cross steers, average weight 470 kg, were assigned to 4 groups and fed rations based on barley-corn silage for 150 days. The diets offered contained 10% untreated whole cottonseed +6% untreated sunflower seed meal (Group I), 10% PCS + 10% PSM (Group 11), 15% PCS + 10% PSM (Group 111), or 20% PCS + 10% PSM (Group IV). Inclusion of PCS at the level of 10, 15, and 20% together with 10% PSM resulted in an increase (P < 0.01) in dressing percentage together with an improvement in feed conversion ratio. There was a 5-8-fold increase in the proportion of linoleic acid (C18: 2) in omental, perirenal, and subcutaneous fat from cattle fed the PCS supplement. A significant reduction occurred in the proportion of oleic acid (C18: 1 cis), but the percentage of palmitic acid (C16: 0) was not affected; the proportion of stearic acid (C18 : 0) in subcutaneous fat increased with PCS supplementation.

Growth performance and carcass characteristics of feedlot cattle fed different levels of macadamia oil cake

“…There was no significant difference (P>0.05) between treatments 1 and 2 in FCR's but cattle on treatment 3 (20% MOC) showed significantly better feed conversion efficiency than those on the other two treatments. These results are in agreement with those reported by Gulati et al (1996) who indicated an improved FCR when dehulled cottonseed and sunflower meal were fed to feedlot steers at different levels. Table 4 shows the warm carcass masses and dressing percentages of cattle fed three levels of MOC.…”

Positional analysis of triacylglycerols from bovine adipose tissue lipids varying in degree of unsaturation

“…The latter have been shown to alter bovine adipose tissue fatty acid composition markedly (19)(20)(21), as the caseinformaldehyde protection prevents ruminal hydrogenation of ingested fatty acids. Compared to cattle of similar genotype raised in the United States and fed corn-based diets for 100 d (13), the MUFA1 group was enriched with 18:1 (49 vs. 40%) and 16:1 (5 vs. 3%), and was notably lower in 18:0 (10 vs. 15%).…”

Δ9 desaturase activity in bovine subcutaneous adipose tissue of different fatty acid compositiondesaturase activity in bovine subcutaneous adipose tissue of different fatty acid composition

“…Where cyclopropenoic acids were detected in adipose tissues of rats, it was fed at subacute levels (14). Feeding formaldehyde-protected fatty acid supplements such as CSO has been reported to improve growth performance and to alter the fat composition of cattle quite dramatically (18). CSO is highly unsaturated, having more than 50% 18:2 (19), and high percentages of 18:2 (up to 10%) were found in adipose tissue of cattle fed protected CSO (18).…”

“…Feeding formaldehyde-protected fatty acid supplements such as CSO has been reported to improve growth performance and to alter the fat composition of cattle quite dramatically (18). CSO is highly unsaturated, having more than 50% 18:2 (19), and high percentages of 18:2 (up to 10%) were found in adipose tissue of cattle fed protected CSO (18). As significant amounts of dietary 18:2 were deposited in fat tissues, clearly some portion of these polyunsaturated fatty acids were protected from hydrogenation in the rumen.…”