Effect of hatching time on time to first feed intake, organ development, enzymatic activity and growth in broiler chicks hatched on-farm

Influence of the preplacement holding time and feeding hydration supplementation before placement on yolk sac utilization, the crop filling rate, feeding behavior and first-week broiler performance

“…It appeared that some time before chick placement was required for the chicks to become motivated to engage in feed and water seeking activities at 3 h after placement based on comparison of the other groups to the 6 h group. This finding was consistent with the findings of Boyner et al (2021) , who found that the full crop percentage increased when chicks were held for an additional 6 h before placement. In this trial, the chicks held for 72 and 6 h were the most and least eager to find feed and water, respectively, with those held for 24, 48 and 60 h being quite similar, at least as demonstrated by their relative crop fill value at 3 h post placement.…”

“…Chick behaviors were studied by scan sampling at the observation times to determine the eating and drinking drives of the chicks after placement in all pens. The number of chicks performing either of the following behaviors was recorded: (1) eating from the feeder and chick paper or (2) drinking water from the nipples ( Boyner et al, 2021 ).…”

Effects of early post-hatch feeding on the growth performance, hormone secretion, intestinal morphology, and intestinal microbiota structure in broilers

“…After chicks hatch out of the incubation machine, there is an interval in the hatching window during which chicks are deprived of feeds and water for up to 24 h ( Liu et al, 2020 ). Besides, owing to farm transportation and other factors, chicken feed deprivation time can attain 48 h or even 72 h ( Boyner et al, 2021 ). Some previous studies have corroborated that long-term feed deprivation after hatching can reduce the weight of chick organs ( Lamot et al, 2014 ), delay the development of the gastrointestinal tract ( Liu et al, 2020 ), damage intestinal health and immune system development ( Panda et al, 2015 ), and lower the survival rate of chicks ( Wijnen et al, 2021 ).…”

Méthodologies pour choisir et caractériser des extraits de plantes et évaluer leurs activités biologiques sur l’immunité des poulets

“…i) La durée de stockage des oeufs à couver, quand elle est supérieure à 7 j, peut impacter la viabilité embryonnaire, mais également la capacité de réponse au stress oxydant et la croissance des poussins (Elibol et Brake, 2008 ;Alsobayel et Al-Miman, 2010 ;Pertusa et al, 2017). Une longue durée de stockage des oeufs augmente également la fenêtre d'éclosion et allonge le délai d'accès à la première prise d'aliment et d'eau sur le site d'élevage (Boyner et al, 2021).…”

“…iii) Un retard d'alimentation de 24 h a des effets négatifs sur le développement du tractus gastro-intestinal (capacité de digestion d'aliment exogène riches en carbohydrates) (Ravindran, 2003 ;Lamot et al, 2014), sur l'utilisation du sac vitellin (oxydation des réserves énergétiques) (Noy et Sklan, 2001) ce qui implique des répercussions sur la croissance de l'animal (Noy et Sklan, 1999 ;Sklan et al, 2000). L'accès tardif à l'alimentation et à l'eau a également des effets négatifs sur l'activation du système immunitaire (Bar Shira et al, 2004) induisant des risques de développement de maladies et voire la mort de l'animal (Boyner et al, 2021). iv) La vitamine E est une molécule antioxydante exogène apportée par l'alimentation des volailles.…”