Comparative impact of bacitracin and select feed additives in the feeding program of Lohmann LSL-Lite pullets at the onset of lay through to 31 weeks of age

Translational Animal Science, Journal Year: 2024, Volume and Issue: 8

Published: Jan. 1, 2024

Abstract There are limited investigations on the role of feed additives in easing transition pullets to egg production phase. We investigated effects supplementation bacitracin methylene disalicylate (BMD) and select (myristic acid [MA], benzoic [BA], Aspergillus niger probiotic [PRO]) feeding program for from onset lay through 31 weeks age (woa). Parameters measured included hen-day (HDEP), intake (FI), conversion ratio (FCR), quality characteristics, ceca microbial activity, apparent retention components, plasma metabolites. A total 1,200 Lohmann LSL Lite were procured at 18 woa placed enriched cages (30 birds/cage) based body weight (BW) allocated five diets. The diets a basal diet formulated meet specifications or mixed with either BMD, MA, BA, PRO. Birds had free access water throughout experiment. Between 20 woa, birds fed BMD ate similar (P > 0.05) amount BA birds, but more = 0.0003) than basal, PRO Basal lower HDEP 0.001) lighter eggs < 0.0001) any between 21 woa. hens higher 0.009) abundance Escherichia coli Consequently, 0.011) Lactobacilli: E. (LER) diet. Specifically, relative basal-fed hens, LER was by 37%, 21%, 26%, 45%, respectively. Moreover, tended have concentration digesta acetic 0.072) isobutyric 0.096). In conclusion, supplementing pullet broad-spectrum antibiotics (MA, PRO) positive impact FI, linked modulation indices gut health. results suggested programs can bolster productivity outcomes.

Language: Английский

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Comparative analysis between multi-strain probiotics and antibiotic as starter feed supplement of poultry on growth performance, serum metabolites and meat quality

Veterinary and Animal Science, Journal Year: 2024, Volume and Issue: 24, P. 100346 - 100346

Published: March 6, 2024

The unobstructed use of antibiotics in poultry production has emerged as a major driving force antibiotic resistance and public health hazard, particularly developing countries. This study aimed to determine the functional roles lyophilized native probiotic based starter feed on performance, selective serum metabolites meat quality poultry. A total 90 day-old birds (30 broilers, 30 layers ducks) were used experimental which divided into three treatment groups for each kind bird. Isolated strains from chicken intestine prepare samples. Growth performances measured manually, biochemicals analysis carried out using diagnostic kits, was determined through Kjeldahl method Soxhlet method. When compared receiving antibiotics, introduction probiotics significantly (

Language: Английский

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Significance of successive feeding of sources of n-3 fatty acids to broiler breeders and their progeny on growth performance, intestinal lesion scores, lymphoid organs weight and plasma immunoglobulin A in broiler chickens challenged with Eimeria

Poultry Science, Journal Year: 2024, Volume and Issue: 103(7), P. 103796 - 103796

Published: May 18, 2024

The study examined the effects of successive feeding sources n-3 PUFA to broiler breeders (BB) and their progeny in chickens challenged with Eimeria. BB were fed: 1) control (CON), corn-soybean meal diet, 2) CON + 1 % microalgae (DMA), as a source DHA 3) 2.50% co-extruded full fat flaxseed (FFF), ALA. Eggs hatched at 34, 44, 54 wk age. Posthatch treatments (BB-progeny) were: CON-CON, DMA-CON, FFF-CON, DMA-DMA FFF-FFF diets formulated for starter (d 1-10) grower/finisher 11-42) phases. All chicks orally Eimeria (E. acervulina E. maxima) on d 10. Relative CON, DMA FFF increased concentration by ≥ 2-fold hatching eggs diets. There no (P > 0.05) interactions between treatment age 0 10 growth. In general, affected < growth performance throughout study. phase, exposure ALA improved FCR over CON-CON 0.01). interaction was such that younger resulted poor relative older BB. contrast, had similar irrespective Moreover, higher BWG, breast weight lower compared 0.05). intestinal lesion scores, lymphoid organ weights plasma immunoglobulin A (IgA). Successive = 0.006) jejunal scores than birds. results showed non-exposed birds phase. However, responses phase depended type, supporting better yield exposure.

Language: Английский

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Evolution of the Antibiotic Resistance Levels, Multi-Resistance Patterns, and Presence of Antibiotic Resistance Genes in E. coli Isolates from the Feces of Breeding Hens during the Rearing Period

Antibiotics, Journal Year: 2024, Volume and Issue: 13(8), P. 753 - 753

Published: Aug. 10, 2024

The food chain acts as an entry point for antibiotic resistance to reach humans and environment. Because of the importance poultry sector, we investigated prevalence evolution in Escherichia coli isolates from a series 14,500 breeding hens their farm environment during rearing period. Samples included meconium one-day-old breeders fecal samples boot swabs sheds pullets adult hens. All E. chicks, 77% feces 61% swabs, were resistant at least one antibiotic. Cefotaxime multi-drug decreased period 41.2% 80.8% chicks 3.8% 33.8% adults. genes studied detected most common being blaTEM (75%), blaSHV (72%), qnrB (67%). blaCMY-2 was 100% breeders. combination cephalosporin quinolone gene 68.7% swab isolates. Our results highlight need monitor on farms take appropriate measures reduce risk public environmental health.

Language: Английский

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Conditions Necessary for the Transfer of Antimicrobial Resistance in Poultry Litter

Antibiotics, Journal Year: 2023, Volume and Issue: 12(6), P. 1006 - 1006

Published: June 3, 2023

Animal manures contain a large and diverse reservoir of antimicrobial resistance (AMR) genes that could potentially spillover into the general population through transfer AMR to antibiotic-susceptible pathogens. The ability poultry litter microbiota transmit was examined in this study. Abundance phenotypic assessed for antibiotics: ampicillin (Ap; 25 μg/mL), chloramphenicol (Cm; streptomycin (Sm; 100 tetracycline (Tc; μg/mL). qPCR used estimate gene load streptomycin-resistance sulfonamide-resistance aadA1 sul1, respectively, community. determined relative total bacterial abundance using 16S rRNA qPCR. Poultry contained 108 CFU/g, with Gram-negative enterics representing minor (<104 CFU/g). There high Sm (106 107 CFU/g) Tc sizeable antimicrobial-resistance regards copies per genome (aadA1: 0.0001-0.0060 sul1: 0.0355-0.2455). While plasmid observed from Escherichia coli R100, as an F-plasmid donor control, Salmonella recipient vitro, no were detected microcosm inclusion E. R100. Confirmatory experiments showed isolated bacteria not interfering filter matings. As R100 at °C, conjugative pRSA chosen its frequency (10-4 10-5) °C. strain background influenced persistence litter, ever observed. Although contains significant load, potential is low under conditions commonly assess conjugation.

Language: Английский

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