Influence of delayed placement and dietary lysine levels on small intestine morphometrics and performance of broilers

Abstract

This experiment studied the influence of delayed placement (HI) and digestible lysine level (DL) on the morphometrics of the intestinal mucosa and on the performance of broilers. A total number of 1,705 Cobb 500 male chicks were used in a completely randomized experimental design in a factorial arrangement with four HI (12, 24, 36 and 48h), and two DL level in the starter diet (1.143 and 1.267%), with four replicates and 55 birds per experimental unit. The amino acids methionine-cystine, threonine, and tryptophan were balanced according to the ideal protein (IP) concept. Small intestine morphometrics was evaluated using histology slides of the duodenum and jejunum. There was no interaction between HI and DL levels for any of the studied parameters. The 1.143% level of DL promoted better performance results at 21 and 42 days of age, as well as higher duodenum and jejunum crypt depth, and duodenum villi height at 21 days of age. HI negatively influenced the morphometrics of the small intestine during the starter phase, and the performance of broilers up to 42 days of age. There was no effect of the treatments on yolk sac utilization or abdominal fat percentage. It was concluded that the use of 1.143% DL and HI of 12 hours promoted better development of the small intestine mucosa up to 21 days of age, and broiler performance at market age

Effects of Oregano Essential Oil Supplementation to Diets of Broiler Chicks with Delayed Feeding After Hatching. Morphological Development of Small Intestine Segments

“…In order to realise this potential, they must be fed to meet their nutritional requirements and able to digest the feed and absorb its nutrients. These processes are directly correlated to the development of gastrointestinal tract, especially of the small intestine (Franco et al, 2006). At hatching, the digestive system especially the small intestine of broiler chick is anatomically immature and its functional capacity is not fully developed.…”

Effects of starter feeding time on body growth and viscera development of newly hatched chicks

“…Variations in environmental temperature, nutritional levels employed, amount of feed intake in the period after feed restriction, genetic line, sex and severity of restriction are some of the causes for the observed differences (Yu and Robinson, 1992). Recently, more attention has been given to the effect of feeding time on performances of chicks, but the physiological basis remains to be elucidated (Noy and Pinchasov, 1993;Noy and Sklan, 1998a;Sklan and Noy, 2000;Bigot et al, 2001;Franco et al, 2006).…”

Effect of Dietary Lysine Regimens on Growth Performance and Meat Composition in Aseel Chicken

“…Hence, chickens grow faster at a relatively high dietary Lys concentration in the diet compared with diet having less Lys (Li et al 2013). Moreover, increased weight gain in higher and medium Lys diets may also be attributed to its distinct characteristic of increasing villous height in jejunum and ileum with increasing Lys levels (Vaezi et al 2011;Wang et al 2009) and increasing crypt depth in duodenum and jejunum (Franco et al 2006) ultimately accelerating early growth through improved nutrient digestion and uptake.…”