Morphological changes of the intestinal mucosa of broilers and layers as affected by fasting before sample collection

Abstract

The present study aimed at evaluating the histo-morphological changes resulting from different fasting periods before the collection of tissue samples in different segments of the small intestine (duodenum, jejunum and ileum) of 7-d-old male chicks of a broiler and a layer strain. A completely randomized experimental design in in a 2x7 factorial arrangement, being two strains with different growth rates (Ross 308 and HyLine® W36) and seven fasting periods (0, 2, 4, 6, 8, 10 and 12 hours ), with six replicates, totaling 84 birds. The comparison of the morphometrics of the duodenum, jejunum and ileum of broiler and layer chicks demonstrated faster digestive tract development in broilers relative to layers. The fasting period caused morphological changes in the liver and small and large intestines in both strains. Therefore, it must be highlighted that in studies involving organ weights and intestinal morphometrics, birds must not be submitted to fasting before tissue collection

Effects of the inclusion of sunflower hulls in the diet on growth performance and digestive tract traits of broilers and pullets fed a broiler diet from zero to 21 d of age. A comparative study

“…In absolute terms, the GIT was heavier and the SI and cecum were longer in broilers than in pullets, in agreement with most published reports (Nir et al, 1993;Mahagna and Nir, 1996;Zavarize et al, 2012). In relative terms, however, an opposite effect was observed in most cases.…”

“…In fact, at 21 d of age, the relative weight of all the organs of the GIT, and the relative length of the small intestine and cecum, were significantly greater in pullets. Similar data have been reported by Mahagna and Nir (1996) and Zavarize et al (2012) comparing broilers and pullets at young ages. The data suggest that when comparing chicken lines with marked differences in rate of growth, the interest of comparing in relative terms the weight and length of the GIT organs should be taken cautiously (Buzala et al, 2015).…”

Effect of oregano oil dietary supplementation on production parameters, height of intestinal villi and the antioxidant capacity in the breast of broiler

“…The highest villi appeared in 42 days old chickens, and the size in duodenum, jejunum and ileum was greater by 16, 22 and 70%, respectively, compared to that reported by Chiang et al (2010) and Zavarize et al (2012). Other researchers report no morphological changes at doses of 500 mg of oregano oil per kg of feed (Onderci et al 2008, Betancourt et al 2012, Emami et al 2012, Laudadio et al 2012, Wu et al 2013.…”

Comparative study of the inclusion of sunflower hulls in the diet on growth performance and digestive tract traits of broilers and pullets from 0 to 21 days of age

“…Zavarize et al (2012) reported also higher VH and CD in broilers than in pullets at 7 d of age, although in this research the difference in CD was not significant.…”