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broilerbreeders, etc ; breasts; females; nest boxes; nests; Show all 5 Subjects
Abstract:
... Roosting on elevated areas is part of natural chicken behaviour, and therefore perches are required for broiler breeders in some countries. However, elevated slats may also meet the behavioural requirements. To date, hardly any research has been done on broiler breeder preferences for roosting on slats or perches. An experiment was conducted between 40 and 60 weeks of age (WOA) to observe the rela ...
broilerbreeders, etc ; agriculture; descriptive statistics; egg weight; eggs; phenotype; Show all 6 Subjects
Abstract:
... In order to determine phenotypic correlations between the quality traits of eggs from 41-week-old broiler breeder hens (Cobb 500), a total of 105 eggs suitable for incubation were analyzed using descriptive statistics and Pearson’s correlation coefficient. The average values of egg weight, egg length, egg width, egg shape index, shell thickness, shell weight, and shell ratio were 66.90 g, 60.00 mm ...
broilerbreeders, etc ; blood serum; chicks; embryonic mortality; flocks; storage time; triiodothyronine; Show all 7 Subjects
Abstract:
... This study investigated the effects and possible interactions of storage and nonventilation during incubation for eggs from Sasso broiler breeder flock on pre- and post-hatch incubation results. A total of 1,260 Sasso eggs from a 58-wk-old broiler breeder flock were individually numbered, weighed and stored for 7 d or for 18 d in a climate-controlled room (16°C, 75% RH). After storage, eggs were w ...
broilerbreeders, etc ; body weight; diet; motivation; novel foods; oats; reproduction; restricted feeding; Show all 8 Subjects
Abstract:
... During the rearing period, broiler breeders are feed restricted to prevent the negative impact of fast growth and high body weight on health and reproduction. Feed restriction causes frustration and stress, resulting in stereotypic pecking and hyperactivity. Nutritional strategies have the potential to reduce these welfare issues. Using a 2×2 factorial completely randomized block design, pullets w ...
broilerbreeders, etc ; Salmonella; antibiotics; competitive exclusion; lactic acid; salmonellosis; spleen; weight gain; Show all 8 Subjects
Abstract:
... Non-typhoidal Salmonella spp. cause persistent asymptomatic infections in poultry. The consumption of Salmonella-infected poultry products is associated with food poisoning. One of the pathogens that causes such infections is Salmonella ser. Enteritidis (SE). Therefore, alternative measures are required for better control of salmonellosis and to reduce potential antibiotic use. Here, the efficacy ...
broilerbreeders, etc ; chicks; feed conversion; feed intake; mortality; poultry housing; weight gain; Show all 7 Subjects
Abstract:
... This study investigated the effects of broiler chick hatching time and pull time on subsequent live performance. Hatching eggs were obtained from commercial broiler breeder flocks of Ross 308 at 29 and 30 wk of age in trials 1 and 2, respectively. Eggs were incubated in 2 identical setters on 2 consecutive days. In both trials, portion of the eggs (9,600), incubated on the first day of set, were a ...
broilerbreeders, etc ; diet; dose response; egg composition; egg quality; eggs; embryogenesis; growth curves; Show all 8 Subjects
Abstract:
... Egg characteristics have an impact on embryonic development and post-hatch performance of broilers. The impact of growth curve (GC) and dietary energy-to-protein ratio of broiler breeder hens on egg characteristics was investigated. At hatch, 1,536 pullets were randomly allotted to 24 pens in a 2 × 4 factorial dose-response design with 2 GC (standard growth curve = SGC or elevated growth curve = E ...
broilerbreeders, etc ; animal behavior; breasts; dermatitis; flocks; hybrids; keel bone; perch; pododermatitis; pullets; steel; wood; Show all 12 Subjects
Abstract:
... An important behavioral need for laying hens is perching, but few studies have investigated perching behavior in commercial broiler breeder pullets. The aim of this study was to investigate perching behavior throughout the pullet period and preferences for different perch types and heights. We also investigated the effect of hybrid on perching and the potential effect of perches on keel bone damag ...
broilerbreeders, etc ; diet; docosahexaenoic acid; jejunum; linseed; liver; microalgae; omega-3 fatty acids; spleen; tissue weight; Show all 10 Subjects
Abstract:
... Dietary long chain polyunsaturated n-3 fatty acids (n-3 FA) may be beneficial to broiler breeder (BB) development. Therefore, the effects of feeding sources of docosahexaenoic acid (DHA) and α-linolenic acid (ALA) from hatch through to 22 weeks of age (woa) on growth, organ weight, and jejunal histomorphology were investigated. A total of 588-day-old Ross × Ross 708 BB were reared on one of 3 diet ...
broilerbreeders, etc ; Escherichia coli; animal welfare; antibiotic resistance; autogenous vaccines; genomics; phylogeny; poultry production; single nucleotide polymorphism; virulence; Show all 10 Subjects
Abstract:
... Escherichia coli is the main bacterial cause of major economic losses and animal welfare issues in poultry production. In this study, we investigate the effect of an autogenous vaccine on E. coli strains longitudinally isolated from broiler breeder flocks on two farms. In total, 115 E. coli isolates were sequenced using Illumina technologies, and compared based on a single-nucleotide polymorphism ...
broilerbreeders, etc ; colorimetry; corticosterone; eggs; enzymatic reactions; excreta; feed intake; growth models; liquid chromatography; puberty; tandem mass spectrometry; Show all 11 Subjects
Abstract:
... Blood concentration of corticosterone (CORT) is a measure of welfare in feed restricted broiler breeders. The RIA and ELISA have been routinely used for measuring CORT in blood, excreta, and feather. Due to the presence of some confounding factors in the aforementioned colorimetric enzyme reaction methods, some methodological difficulties have been attributed to those assays. The correlation betwe ...
broilerbreeders, etc ; Escherichia coli; acid tolerance; ampicillin; antibiotic resistance; cephalothin; chloramphenicol; genes; nalidixic acid; phenotype; tetracycline; virulence; Korean Peninsula; Show all 13 Subjects
Abstract:
... Broiler breeder farms could be a reservoir of Escherichia coli, disseminating antimicrobial resistance and virulence factors. We investigated the antimicrobial resistance of E. coli from nine broiler breeder farms and characterised their resistance and virulence genes. A total of 256 E. coli showed a high level of resistance to tetracycline, nalidixic acid, ampicillin, and cephalothin, followed by ...
broilerbreeders, etc ; Avian orthoavulavirus 1; Avian orthoreovirus; Infectious bursal disease virus; antibodies; body weight; chicken industry; enzyme-linked immunosorbent assay; farms; hatcheries; yolk sac; China; Show all 12 Subjects
Abstract:
... The present study aimed to investigate the quality of newly hatched broiler chicks delivered to Hong Kong (imported or local), and to develop tailored recommendations to improve their management. During 2019–2021, 70 batches (34 imported from mainland China and 36 local) of one/three day old chicks on 11 broiler farms were studied. From each batch, 23 or 24 chicks (1647 in total) were assessed for ...
... Due to the global spread of antibiotic resistance, there is a strong demand to replace antimicrobial growth promotors in livestock. To identify suitable additives that inhibit the growth of avian pathogenic Escherichia coli O1/O18 and Salmonella enterica serotype Enteritidis strains, an ex vivo screening was performed. Inulin and fructooligosaccharides (FOS) were investigated as prebiotics. Entero ...
broilerbreeders, etc ; body weight; diet; egg production; Show all 4 Subjects
Abstract:
... 1. An experiment was conducted to study the effects of diet density and feeding frequency during the rearing period on broiler breeder performance between three and 40 weeks of age. 2. A total of 960 female one-day-old chicks (Ross 308) were randomly allocated to 24 floor pens (12 pens in two rooms). On day 21 pullets were assigned to a 2 × 2 factorial arrangement including two diets (control (CON ...
broilerbreeders, etc ; chicks; heritability; models; pedigree; phenotype; reproductive efficiency; Show all 7 Subjects
Abstract:
... Reproductive efficiency such as fertility and hatch of fertile (HoF) are of economic importance and concern to breeding companies becaue of their effects on chick output. Similar to other traits of economic importance in poultry breeding, the rate of response for HoF is largely dependent on the use of an appropriate model for evaluating the trait. Therefore, the objectives of this study were to es ...
broilerbreeders, etc ; diet; egg production; egg shell quality; energy; phosphorus; Show all 6 Subjects
Abstract:
... Eggshell quality of broiler breeders’ eggs decreases at the end of the laying period. Feeding a limited daily allowance of feed in the morning does not supply the necessary nutrients, particularly calcium for eggshell formation, at the right time of the day. Therefore, an experiment was conducted to study the effects of providing a standard diet twice a day or split feeding (special morning and af ...
Christina L. Swaggerty; J. Allen Byrd; Ryan J. Arsenault; Famatta Perry; Casey N. Johnson; Kenneth J. Genovese; Haiqi He; Michael H. Kogut; Andrea Piva; Ester Grilli
... Necrotic enteritis (NE) is a devastating disease that has seen a resurgence of cases following the removal of antibiotics from feed resulting in financial loss and significant animal health concerns across the poultry industry. The objective was to evaluate the efficacy of a microencapsulated blend of organic (25% citric and 16.7% sorbic) acids and botanicals (1.7% thymol and 1% vanillin [AviPlusP ...
broilerbreeders, etc ; alcohols; body weight changes; cloves; essential oils; feed conversion; feed intake; fumigation; Show all 8 Subjects
Abstract:
... The objective of this study was to evaluate whether sanitizing hatching eggs with clove essential oil in the preincubation phase affects broiler performance and influences the hatch window and quality of embryos and one-day-old chicks. Hatching eggs (n = 1280; mean weight = 58.64 ± 0.49 g) from a batch of 37-week-old broiler breeder hens of the CPK (Pesadão Vermelho) lineage were randomly distribu ...
broilerbreeders, etc ; condensation (phase transition); egg hatchability; egg incubation; eggs; embryogenesis; flocks; heat; mortality; temperature; Show all 10 Subjects
Abstract:
... Preheating can increase the efficiency of commercial broiler breeding. A slow increase in temperature can counteract the negative effects of water condensation on the surface of the shell and reduces the thermal shock to the embryos. It is essential to design different preheating profiles because of the variances between breeds in terms of egg construction and the course of embryogenesis, along wi ...