title: Profile of fatty acids, muscle structure and shear force of musculus longissimus dorsi (MLD) in growing pigs as affected by energy and protein or protein restriction followed by realimentation.
abstract: Forty-eight gilts were submitted to a 30% restriction of feed (groups F and F1) or protein intake (group P) from 90 to 118 days of age, followed by realimentation from 119 to 168 days of age. Control pigs (C) were fed during the whole experiment according to a semi ad libitum scale. During realimentation all animals were fed according to semi ad libitum scale except pigs F1 which were fed ad libitum. Six pigs from each group were slaughtered at the end of restriction and realimentation. Restriction decreased the weight of musculus longissimus dorsi (MLD) and increased shear force. Restriction of feed intake depressed MUFA concentration and increased n-6/n-3 ratio while protein restriction decreased n-6/n-3 and PUFA:SFA ratios. Structure of fibers was not affected. After realimentation MLD mass was still lower in all previously restricted pigs, shear force was the lowest in F1 pigs. Only percentage of fast twich oxidative fibers was significantly greater in F1 pigs than in others. Significant correlations between parameters investigated during the study were found.
authors.affiliation: The Kielanowski Institute of Animal Nutrition and Physiology, Polish Academy of Sciences, Jabłonna, Poland. g.skiba@ifzz.pan.pl
authors.forename: Grzegorz
authors.initials: G
authors.lastname: Skiba
authors.forename: Stanisława
authors.initials: S
authors.lastname: Raj
authors.forename: Ewa
authors.initials: E
authors.lastname: Poławska
authors.forename: Barbara
authors.initials: B
authors.lastname: Pastuszewska
authors.forename: Gabriela
authors.initials: G
authors.lastname: Elminowska-Wenda
authors.forename: Joanna
authors.initials: J
authors.lastname: Bogucka
authors.forename: Damian
authors.initials: D
authors.lastname: Knecht
mesh_terms: D000818:Animals; D031204:Caloric Restriction; D018753:Diet, Protein-Restricted; D002149:Energy Intake; D005227:Fatty Acids / Q000032:analysis*; D005260:Female; D008460:Meat / Q000032:analysis*; D018656:Muscle Fibers, Fast-Twitch; D018482:Muscle, Skeletal / Q000033:anatomy & histology*; D009929:Organ Size; D013314:Stress, Mechanical; D034421:Sus scrofa
chemical_list: D005227:Fatty Acids