title: Effect of supplementation of crystalline lysine on the performance of WL layers in tropics during summer.
abstract: A trial was conducted to evaluate the effect of lysine concentration in the diet of WL layers with constant ratio of other essential amino acids to lysine. Pullets (528) aged 25 to 36 weeks were fed with test diet containing two protein levels (13.36 and 15.78%) each with 5% concentration of lysine (0.50, 0.55, 0.60, 0.65, and 0.70) and a control with 17% CP and 0.70%, lysine. Each test diet was fed ad libitum to six replicates of eight birds for a period of 12 weeks. Egg production (EP), egg weight (EW), egg mass (EM), feed efficiency (g/g) (FE), body weight gain (BWG), Haugh unit (HU) and yolk colour (YC) were measured. Increased (P ≤ 0.05) EP, EW, EM, FE and BWG were obtained with increasing lysine concentration in diets. Whereas, feed intake/h/day, feed intake/egg, egg shell defects (ESD), mortality and shell thickness were not affected (P ≥ 0.05) by the concentration of lysine in diet. However, higher (P ≤ 0.05) HU score and YC were noticed at low lysine (0.50 %) concentrations. Based on this, it was concluded that WL layers (25-36 weeks) reared in open-sided houses in the tropics require approximately 0.70 % lysine (597.90 vs. 584.39 mg/h/day) in low (13.36% CP) and high (15.78% CP) protein groups in diets containing approximately 2700 kcal of ME/kg in summer.
authors.affiliation: Department of Poultry Science, NTR College of Veterinary Science, Gannavaram, Andhra Pradesh, India. nkkallam3@gmail.com.
authors.forename: K Naga Raja
authors.initials: KN
authors.lastname: Kumari
authors.affiliation: Department of Poultry Science, College of Veterinary Science, Rajendranagar, Hyderabad, Telangana, India.
authors.forename: V Ravinder
authors.initials: VR
authors.lastname: Reddy
authors.affiliation: Department of Poultry Science, College of Veterinary Science, Korutla, Telangana, India.
authors.forename: V Chinni
authors.initials: VC
authors.lastname: Preetham
authors.affiliation: Department of Animal Nutrition, NTR College of Veterinary Science, Gannavaram, Andhra Pradesh, India.
authors.forename: D Srinivas
authors.initials: DS
authors.lastname: Kumar
authors.affiliation: ICAR-Central Institute of Fisheries Education (Deemed University), Kolkata Centre, Kolkata, India.
authors.forename: Arup Ratan
authors.initials: AR
authors.lastname: Sen
authors.affiliation: Directorate of Poultry Research, Rajendranagar (ICAR), Hyderabad, India.
authors.forename: S Venkata Rama
authors.initials: SV
authors.lastname: Rao
mesh_terms: D000821:Animal Feed; D000818:Animals; D002645:Chickens; D004032:Diet / Q000662:veterinary*; D019587:Dietary Supplements; D004528:Egg Shell; D004531:Eggs; D005260:Female; D006813:Humidity; D008239:Lysine / Q000008:administration & dosage*; D010058:Oviposition / Q000187:drug effects*; D010063:Ovum / Q000187:drug effects; D012621:Seasons; D013696:Temperature; D015430:Weight Gain
chemical_list: D008239:Lysine
keywords: Amino acids; Lysine concentration; Production parameters; Summer; Tropics; WL layers