Evaluation of the effects of dietary fat, conjugated linoleic acid, and ractopamine on growth performance, pork quality, and fatty acid profiles in genetically lean gilts.

摘要: An 8-wk study of the effects CLA, rendered animal fats, and ractopamine, their interactive on growth, fatty acid composition, carcass quality genetically lean pigs was conducted. Gilts (n = 228; initial BW 59.1 kg) were assigned to a 2 x 3 factorial arrangement consisting fat treatments. The CLA treatment consisted 1% oil (CLA-60) or soybean oil. Ractopamine levels either 0 10 ppm. Fat treatments 0% added fat, 5% choice white grease (CWG), beef tallow (BT). initiated at kg BW, 4 wk before ractopamine imposed when gilts reached 85.7 lasted for duration final until data collected. Lipids from belly, outer inner layers backfat, LM extracted analyzed composition 6 per 8. Feeding increased (P < 0.02) G:F during wk. Pigs fed as CWG BT exhibited decreased 0.05) ADFI 0.01) G:F. Adding diet ADG, G:F, BW. predicted percentage in ractopamine. weight. diets 10th rib backfat depth but did not affect percent lean. Bellies subjectively objectively firmer 0.01). Dietary concentration saturated acids unsaturated belly both LM. i.m. content had relatively little effect profiles tissues compared with CLA. These results indicate that work mainly an additive fashion enhance pig growth quality. Furthermore, these more throughout carcass.