Acta Scientific Veterinary Sciences (ISSN: 2582-3183) Volume 4 Issue 1 Janauary 2022 Growth and Body Composition of Kampung Unggul Balitnak (KUB) Chicken as Affected by Diets Containing Varying Levels of Protein and Energy B Indarsih*, MH Tamzil, IN Sukharta Jaya and NK Dewi Haryani Faculty of Animal Science, University of Mataram, Lombok, NTB, Indonesia *Corresponding Author: B Indarsih, Faculty of Animal Science, University of Mataram, Lombok, NTB, Indonesia. Research Article Received: December 01, 2021 Published: December 22, 2021 © All rights are reserved by B Indarsih., et al. Abstract Background and Objective: The study was conducted to evaluate three different feeding regimens on growth performance and body composition of Kampung Unggul Balitnak chickens (KUB) during the growing period. Materials and Methods: One hundred and eighty day old chicks were sexed and fed a commercial crumble diet containing 23% Crude Protein (CP) and 3000 kcal Metabolizable Energy (ME)/kg until 3 days of age after which they were fed according to 17% CP and 3000 kcal ME/kg as Low Protein-Low En- ergy (LP-LE), 19% CP and 3100 kcal ME/kg as Medium Protein-Medium energy (MP-ME) and 21% CP and 3200 kcal ME/kg as High Protein-High Energy (HP-HE). Each feeding regime was designed with three replicates and having 10 birds per replicate. Results: Increasing CP and energy levels in the diet did not improve body weight at 53 days of age, and body weight gain during the overall experimental period (4 to 53 d of age). Feed conversion ratio (FCR) was more efficient (p = 0.0416) in higher protein and energy diets than the lower protein and energy diets. Giblets and inedible parts were not affected by dietary treatments. Sex of KUB chicks had significant effects on feed intake, FCR, drumstick, giblet and leg. Conclusions: LP-LE diet (17% and 3000 kcal ME/kg) was sufficient for females while MP-ME diet (19% CP and 3100 kcal ME/kg) was appropriate for the males. Keywords: Body Weight; Feed Intake; Growth Rate; Sex Introduction Kampung Unggul Balitnak (KUB) is an indigenous Indonesian chicken breed evolved recently at the Livestock Research Centre, Ciawi, Bogor through individual selective breeding of female lines for six generations 1. KUB chicken is characterized by higher egg production capacity (160-180 eggs/hen/year), better resistance to disease, and lower broodiness than most local chicken [1]. As egg producers, KUB chicken is preferred to be raised in different production systems [2,3]. Regarding the feeding regimes, although scientific reports are scanty, a diet containing 16% crude protein (CP) and 2800 kcal metabolizable energy (ME)/kg is thought to be sufficient for the layer chicks of this breed during the period from 0 to 12 wk 2 . Based on a case study on semi-intensive and intensive systems applied by small holders [3], KUB chickens when fed a diet containing 12.8 to 16.8% crude protein and 2,614 to 2,750 kcal ME/kg, achieved body weights at marketing of 850-950 g (at 90 d of age), implying that feeding practices for optimal production are variable in different production systems. However, experimental studies in this respect are rare. Previous studies by Bouwkamp., et al. (1973) [4] and (Moran, l994) [5] in broiler chicken showed that the response of different genotypes to different nutrients may vary within a class of birds. Differences in nutrient requirements are a major cause of observed differences in portion of carcass yield [4,5] and of differences in body composition [6] of growing chickens. In addition, the variable nutrient requirements as growth proceeds are a challenge in optimizing the nutrient requirements for optimal growth performance [7] Therefore, an experimental was under- taken to determine the response of KUB growing chicks to differ- ent dietary protein and energy levels and to provide the possibility of determining the nutrient requirements relating to the different production systems in terms of the optimal growth rate. Citation: B Indarsih., et al. “Growth and Body Composition of Kampung Unggul Balitnak (KUB) Chicken as Affected by Diets Containing Varying Levels of Protein and Energy". Acta Scientific Veterinary Sciences 4.1 (2022): 161-166. DOI: 10.31080/ASVS.2022.04.0291