title: Impact of second line limiting amino acids' deficiency in broilers fed low protein diets with rapeseed meal and de-oiled rice bran.
abstract: OBJECTIVE
  To study the impact of deficiency of second line limiting amino acids (SLAA; valine, isoleucine and tryptophan) on the production performance and carcass characteristics of commercial broilers.
  
  
  METHODS
  A control (T1) corn-soy diet was formulated to contain all essential AA on standardized ileal digestible basis; While in T2-a 'moderate SLAA deficit' diet was formulated by replacement of soybean meal with 6% rapeseed meal and T3-a 'high SLAA deficit' diet was formulated by replacement of soybean meal with 6% de-oiled rice bran. Each of these treatments was allotted to six replicates of ten chicks each. During the 42 days experimental period, growth performance, carcass parameters and intake of metabolizable energy (ME), crude protein (CP) and AA were studied.
  
  
  RESULTS
  The cumulative body weight gain, feed conversion ratio, carcass cut weights and yields of carcass, breast and thighs were decreased (p<0.05) in T3 compared to T1. The absolute intake of ME, lysine, methionine + cysteine and threonine were not affected while intake of CP and all SLAA were reduced in SLAA deficit diets. The relative intake of ME, lysine, methionine + cysteine, threonine and SLAA reduced in T3 in comparison to T1. The relative weights of internal organs were not affected by treatments while the abdominal fat percentage was increased linearly to the magnitude of SLAA deficiency.
  
  
  CONCLUSIONS
  The deficiency of SLAA decreased performance, carcass yields and impaired utilization of ME, CP and AA linearly to the magnitude of the deficiency.
authors.affiliation: Department of Animal Nutrition, Veterinary College, Hebbal, Bangalore, India.
authors.forename: C Basavanta
authors.initials: CB
authors.lastname: Kumar
authors.affiliation: Department of Animal Nutrition, Veterinary College, Hebbal, Bangalore, India.
authors.forename: R G
authors.initials: RG
authors.lastname: Gloridoss
authors.affiliation: Division of Animal Sciences, Karnataka Veterinary, Animal and Fisheries Sciences University, Hebbal, Bangalore, India.
authors.forename: K Chandrapal
authors.initials: KC
authors.lastname: Singh
authors.affiliation: Department of Animal Nutrition, Veterinary College, Hebbal, Bangalore, India.
authors.forename: T M
authors.initials: TM
authors.lastname: Prabhu
authors.affiliation: Senior Technical Officer, Southern Research Station, National Dairy Research Institute, Bangalore, India.
authors.lastname: Siddaramanna
authors.affiliation: Department of ILFC, Veterinary College, Hassan, India.
authors.forename: B N
authors.initials: BN
authors.lastname: Suresh
authors.affiliation: Department of Animal Science, Krishi Vignyana Kendra, Bangalore Rural Dist, India.
authors.forename: G A
authors.initials: GA
authors.lastname: Manegar
keywords: isoleucine; tryptophan and broilers; valine