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Vitamin D requirements and relative bioavailability for starter male White Pekin ducks fed either cholecalciferol or 25-hydroxycholecalciferol.
Poult Sci
January 2025
State Key Laboratory of Animal Nutrition and Feeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China. Electronic address:
The objectives were to investigate effects of various concentrations of dietary vitamin D (VD) or 25-hydroxycholecalciferol (25-OH-D) on growth performance, VD status, calcium (Ca) metabolism, and tibia mineralization of starter male White Pekin ducks, and dietary requirements and relative bioavailability of these two compounds. One-day-old male White Pekin ducks (n = 624) were assigned to 13 dietary treatments, including 6 added VD concentrations (100, 200, 400, 800, 1200, and 2000 IU/kg), and 2 vitamin D sources (VD and 25-OH-D), plus a negative control (no vitamin D supplementation) for 21 days. Each group had 6 replicate pens of 8 birds per pen.
View Article and Find Full Text PDFDeciphering the Resistome and Mobiolme of an Avian-Associated ST249 Clone that Acquired Vancomycin Resistance Isolated from Neutropenic Patient in Tunisia.
Microb Drug Resist
December 2024
Laboratory Ward, National Bone Marrow Transplant Center, Tunis, Tunisia.
Article Synopsis
- - The study identified the first vancomycin-resistant Enterococcus (VREfs) strain in Tunisia from an 8-year-old patient with bone marrow issues, using whole-genome sequencing (WGS) after isolating it during a hospital stay.
- - The strain showed significant resistance levels, with minimum inhibitory concentrations of vancomycin >256 mg/L and teicoplanin at 16 mg/L, and was classified as the ST249 clone typically found in avian sources.
- - This report highlights a novel case where an initially vancomycin-susceptible strain acquired resistance via a plasmid that carried a transposon, aided by specific genetic mechanisms related to conjugation and CRISPR interference
Effects of genotype and sex on carcass composition, meat quality, digestive tract morphometries and leg bone dimensions of spent parent Pekin ducks.
Poult Sci
December 2024
Department of Meat Science, West Pomeranian University of Technology, 71-550 Szczecin, Poland.
The purpose of the present study was to analyze carcass composition, physicochemical properties, muscle texture, and structure, as well as morphometry of the digestive tract and leg bone dimensions of Cherry Valley ducks (SM3 Heavy hybrid) and Orvia ducks (ST5 Heavy hybrid) after laying. A total of 32 ducks were dissected, 8 females and 8 males from each breeding set. Analysis of meat quality (breast muscle, leg muscle) in terms of color (L*, a*, b*), acidity (pH), electrical conductivity (EC), and basic chemical composition (protein, water, fat, collagen) was performed.
View Article and Find Full Text PDFGenome-Wide Association Analysis Identifies Important Haplotypes and Candidate Gene for Body Size Traits in Pekin Ducks.
Animals (Basel)
August 2024
National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproduction of the Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China.
Body size is an important growth indicator in ducks and is a primary selection criterion for physical improvement. An excessively rapid growth rate in meat ducks can result in excessive body size, which may hinder subsequent processing and slaughter operations. However, only a few molecular markers related to body size have been studied in meat ducks.
View Article and Find Full Text PDFNutritional Impacts of Dietary Selenium, Iodine and their Interaction on Egg Performance, and Antioxidant Profile in Laying Longyuan Duck Breeders.
Biol Trace Elem Res
August 2024
Institute of Animal ScienceState Key Laboratory of Livestock and Poultry BreedingKey Laboratory of Animal Nutrition and Feed Science in South China, Ministry of Agriculture and Rural AffairsGuangdong Public Laboratory of Animal Breeding and Nutrition; Guangdong Key Laboratory of Animal Breeding and Nutrition, Guangdong Academy of Agricultural Sciences, Guangzhou, 510640, China.
The present study aimed to optimize the combined effect of dietary selenium (SE) and iodine (ID) on the productive and reproductive performance and antioxidant capacity of Longyuan breeding ducks. A total of 288 Longyan duck breeders aged 20 wk were randomly assigned to four groups with six replicates (n = 72 ducks/group; 12 ducks/replicate). A 2 × 2 factorial arrangement experiment was performed and included 2 supplementation levels of each SE and ID for 200 days of the experimental period.
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