Lysine levels in diets for broilers from 8 to 21 days of age

Abstract

This study was conducted to evaluate the effects of digestible lysine levels in diets with and without supplementation of industrial amino acids on performance and fat deposition in the carcass of broilers in the starter phase. One thousand four hundred and forty chickens with initial weight of 168.1±5.0 g were distributed in a completely randomized experimental design, in a 5 × 2 factorial arrangement, composed of five digestible lysine levels (10.0, 11.0, 12.0, 13.0 and 14.0 g/kg) and two types of diet (diet with different proportions of corn and soybean meal and diet supplemented with industrial amino acids to obtain the digestible lysine levels), with eight replications and 18 birds per replication. There was interaction effect only on weight gain and fat deposition in the birds. The lysine levels reduced feed intake linearly in both diets, but caused a linear increase in lysine intake. The lysine levels quadratically affected weight gain and feed conversion, which improved up to the estimated levels of 13.0 and 12.8 g/kg lysine, respectively, when the corn:soybean meal ratio of the diet changed. In the diets supplemented with amino acids, the lysine levels increased weight gain and improved feed conversion linearly. Regardless of the type of diet, protein deposition increased linearly, whereas fat deposition reduced also linearly, as the lysine levels in the diets were increased. The levels of 13.0 and 14.0 g/kg digestible lysine provide, respectively, the best performance in birds fed a diet in which the proportion of corn and soybean meal varies and a diet supplemented with industrial amino acids, in the period from 8 to 21 days of age.

Effect of digestible amino acids to energy ratios on performance and yield of two broiler lines housed in different grow-out environmental temperatures

“…The performance and processing yield results were coherent with past research. Oliveira et al. (2013) reported a linear increase for BW, feed conversion, and protein accretion, and decrease of fat accretion as dietary lysine levels increased in broilers.…”

Gut microflora and intestinal morphology changes of broiler chickens fed reducing dietary protein supplemented with lysine, methionine, and threonine in tropical environment

“…Nevertheless, the levels of lysine formulated with corn and soybean meal diet had a significant effect on the live weight gain and the feed conversion ratio of broiler (Oliveira et al, 2013). Dietary methionine and lysine deficiency were shown to impair chicken growth (Zhai et al, 2016a).…”

Management Practices and Feed Supplements on the Growth of Two Chicken Breeds (Gallus Domesticus L.) under Smallholders’ Farm Conditions: Case of Rajshahi

“…Farkhoy et al (2012) demonstrated that chicken diets with 1% methionine + cysteine caused optimal performance. de Oliveira et al (2013) assessed the effects of digestible lysine levels in poultry diets with and without supplementation of industrial amino acids on performance and fat deposition in the carcass of broilers in the starter phase where the levels of 13.0 and 14.0 g/kg digestible lysine provided the best performance. According to a FAO (2014) report, commercially manufactured 'pre-mixes' usually contain protein, vitamins and minerals, to which basal feed ingredient(s) like maize or corn, wheat, rice, oat and millet, and tubers such as cassava, yam, potatoes or plantains is added as necessary.…”

“…Since poultry birds have high dietary protein requirements, identification of the optimum protein concentration in their diets, and knowledge about birds' requirements for protein and amino acids and their effects on the birds' growth performance and development are essential (Beski et al, 2015). Thus supplementary diets with amino acids (Geraert et al, 1987), amino acid formulation and dietary direct-fed microbial supplementation in the poultry feed (Applegate et al, 2009), dietary lysine, methionine and L-arginine (Bonekamp et al, 2010;Rao et al, 2011;Fouad et al, 2012), protein and limiting amino acid levels in pre-starter diets (Farkhoy et al (2012), digestible lysine levels in diets with and without supplementation of industrial amino acids (de Oliveira et al, 2013), canola oil and vitamin A supplement to the diet (Ahmed et al, 2013), amino acid-balanced diet supplement (Burley et al, 2013), L-threonine supplemented treatment (Abdel-Wareth & Esmail, 2014), and supplementation of different feed types for different classes of chickens in different seasons (Bekele, 2016) have been reported. Here we report the present status of the management practices and effects of feed supplements with vitamin A (VitA) and essential amino acids (EAAs) on growth performance parameters in terms of feed conversion ratio (FCR), carcass characteristics (CC) and survivability (SB) of two available chicken breeds from a regional government farm, some randomly selected commercial private poultry farms and backyard small households in Rajshahi District, Bangladesh.…”