Effects of access to feed, water, and a competitive exclusion product in the hatcher on some immune traits and gut development in broiler chickens

Boyner, M; Ivarsson, Emma; Wattrang, Eva; Sun, Li; Wistedt, Anna; Wall, H.

doi:10.1080/00071668.2022.2163152

Cited by 2 publications

(2 citation statements)

References 44 publications

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“…Furthermore, the rarefaction curves of observed ASVs revealed a consistent temporal increase in alpha diversity ( Supplementary Figure 1 ). These observations find support in previous studies which have highlighted the age-dependent aspect of caecal microbiota development (Ivarsson et al, 2022 ; Boyner et al, 2023 ). Among changes in the gut microbiota solely connected to the age of the birds, a relatively high RA of ASVs Clostridium_sensu_stricto _1 as well as ASVs Escherichia-Shigella _d46e and unclassified Enterobacteriaceae _9451 (belonging to the phylum Proteobacteria), were observed at day 7, while their RA notably decreased at day 14 ( Figure 3 ).…”

Section: Discussionsupporting

confidence: 91%

No colonization resistance to Campylobacter jejuni in broilers fed brown algal extract-supplemented diets

Eliasson,

Sun,

Cervin

et al. 2024

Front. Microbiol.

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IntroductionCampylobacter jejuni gastroenteritis is the most commonly reported zoonosis within the EU, with poultry products regarded as the primary source of transmission to humans. Therefore, finding strategies to reduce Campylobacter colonization in broilers holds importance for public health. Recent studies suggest that supplementation of broiler feed with brown algal extracts, particularly laminarin, can provide beneficial effects on broiler gut health, growth performance, and gut microbiota. However, its effect on gut microbiota development and subsequent reduction of Campylobacter loads in broiler caeca during the later stages of the birds' lives remains unclear.MethodsExperimental colonization of Ross 308 broilers with two different strains of C. jejuni was conducted, with groups fed either a basal diet or the same basal diet supplemented with 725 ppm algal extract from Saccharina latissima to provide 290 ppm laminarin. Fecal samples were collected for bacterial enumeration, and caecal samples were obtained before and after the C. jejuni challenge for the determination of microbiota development.Results and discussionNo significant differences in fecal C. jejuni concentrations between the groups fed different diets or exposed to different C. jejuni strains were observed. This suggests that both strains colonized the birds equally well and that the laminarin rich algal extract did not have any inhibitory effect on C. jejuni colonization. Notably, 16S rRNA amplicon sequencing revealed detailed data on the caecal microbiota development, likely influenced by both bird age and C. jejuni colonization, which can be valuable for further development of broiler feed formulations aimed at promoting gut health.

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Section: Discussionsupporting

confidence: 91%

No colonization resistance to Campylobacter jejuni in broilers fed brown algal extract-supplemented diets

Eliasson,

Sun,

Cervin

et al. 2024

Front. Microbiol.

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“…In contrast to placement time, no significant differences occurred for the 6 to 60 h preplacement holding times, and the highest BW was found in the 24 h holding time at the end of the trial. Numerous studies have shown that BW was negatively affected by longer post-hatch holding periods in the early period of growing, but no differences were observed at the end of grow-out period [17,[41][42][43][44][45][46][47].…”

Section: Body Weightmentioning

confidence: 99%

Effects and Interactions of Incubation Time and Preplacement Holding Time on Mortality at Placement, Yolk Sac Utilization, Early Feeding Behavior and Broiler Live Performance

Elibol,

Özlü,

Erkuş

et al. 2023

Animals

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The effects and interactions of incubation time and chick preplacement holding time on mortality at placement, utilization of yolk sac, crop filling rate, early feeding–drinking behavior, and broiler live performance were investigated. Ross 308 broiler hatching eggs from a 39-week-old flock were set in two identical setters in a commercial hatchery, with the setting time 12 h earlier in one machine. At the end of incubation, chicks were removed from the hatchers at the same time. Thus, the incubation times were either 504 h (normal incubation time (NIT) treatment) or 516 h (longer incubation time (LIT) treatment). After the pull time, chicks from each incubation time group were subjected to either 6, 24, 48, 60, or 72 h preplacement holding times. At placement, chicks were given access to feed and water. In total, 19,200 chicks were randomly assigned to a total of 10 subtreatment groups (2 incubation times × 5 preplacement holding times). Therefore, a total of 1920 chicks were used in each subtreatment group for the grow-out period in a commercial broiler house. For the first week of the experiment, 160 randomly selected as-hatched (not sexed) chicks were placed in 12 replicate floor pens (120 total pens). From the second week of age onward, chicks from two pens were combined into six replicate pens, with 320 chicks per replicate (60 total pens). An interaction was found between incubation time and preplacement holding time for residual yolk sac (RYS) weight (g, %) (p < 0.001). RYS weight was greater at pull time and at 6 and 24 h of preplacement holding in the NIT treatment compared to the LIT treatment, while differences were no longer evident at 48–72 h. The lowest percentage of chicks with full crops and eating activity was observed in the shortest preplacement holding time (6 h) group at 3 h after placement. As expected, the initial BW at placement clearly decreased with increasing duration after the pull time (p < 0.05), with the highest and lowest weights found in the 6 and 72 h holding time treatments, respectively. This BW difference was still evident at 35 d after placement and chicks held for the longest period after the pull time (72 h) showed the lowest BW (p < 0.001). However, there was no significant difference between the 6 and 60 h preplacement holding times. Mortality during the first 7 d after placement increased only when the preplacement holding time was extended to 72 h (p = 0.031). Similarly to the 7 d results, chicks held for 72 h exhibited higher 0–35 day mortality compared to those held for 6 or 24 h (p = 0.028). Neither BW nor mortality was affected by incubation time treatment at 35 d after placement (p > 0.05). It can be concluded that there were no significant differences in average BW and mortality, up to and including a 60 h holding time under thermal comfort conditions, but a 72 h preplacement holding time resulted in final BW and mortality being negatively affected. In addition, LIT tended to have a beneficial effect on BW and mortality compared to NIT when the preplacement holding time was shorter (6–24 h) but had a negative effect for extended holding times (48–72 h).

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Effects of access to feed, water, and a competitive exclusion product in the hatcher on some immune traits and gut development in broiler chickens

Cited by 2 publications

References 44 publications

No colonization resistance to Campylobacter jejuni in broilers fed brown algal extract-supplemented diets

No colonization resistance to Campylobacter jejuni in broilers fed brown algal extract-supplemented diets

Effects and Interactions of Incubation Time and Preplacement Holding Time on Mortality at Placement, Yolk Sac Utilization, Early Feeding Behavior and Broiler Live Performance

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