title: Effects of low protein diets on pigs with a lean genotype 2. Compositional traits measured with computed tomography (CT).
abstract: The effects on compositional changes across the growing-finishing period (40-115 kg) of feeding pig diets with different protein and amino acid levels were investigated using CT scanning (at 60, 85 and 115 kg live weight). Pigs of a lean commercial genotype were fed a commercial control regime (C), or a low protein regime with either high (LP1) or low (LP2) essential amino acid levels, all balanced for net energy. In vivo CT measurements agreed well with post-slaughter sample joint dissection results for carcass tissue weights/proportions, and CT-measured muscle density predicted intramuscular fat accurately. Pigs on C and LP1 regimes did not differ significantly in composition during growth. However, pigs on the LP2 regime had significantly more fat (in carcass, internal and intra-muscular depots) and less muscle, from 85 kg onwards. Although fat levels differed depending on diet regime (LP2>others), proportions of fat in different body depots were unaffected.
authors.affiliation: Animal and Veterinary Science Group, Scotland's Rural College (SRUC), Edinburgh, UK. Nicola.Lambe@sruc.ac.uk
authors.forename: N R
authors.initials: NR
authors.lastname: Lambe
authors.forename: J D
authors.initials: JD
authors.lastname: Wood
authors.forename: K A
authors.initials: KA
authors.lastname: McLean
authors.forename: G A
authors.initials: GA
authors.lastname: Walling
authors.forename: H
authors.initials: H
authors.lastname: Whitney
authors.forename: S
authors.initials: S
authors.lastname: Jagger
authors.forename: P
authors.initials: P
authors.lastname: Fullarton
authors.forename: J
authors.initials: J
authors.lastname: Bayntun
authors.forename: L
authors.initials: L
authors.lastname: Bünger
mesh_terms: D000273:Adipose Tissue / Q000737:chemistry; D000596:Amino Acids / Q000737:chemistry; D000821:Animal Feed; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001823:Body Composition; D001835:Body Weight; D018753:Diet, Protein-Restricted; D005227:Fatty Acids / Q000737:chemistry; D005838:Genotype; D016014:Linear Models; D008297:Male; D013552:Swine; D015898:Tomography Scanners, X-Ray Computed
chemical_list: D000596:Amino Acids; D005227:Fatty Acids