Effects of whole wheat supplementation on gastrointestinal tract development and growth performance of two broiler strains fed diets differing in energy and nutrient density from 0 to 40 days of age
IF 2.5 2区 农林科学Q1 AGRICULTURE, DAIRY & ANIMAL SCIENCE
H. Kadardar, L. Aguirre, G. Talegón, R. Lázaro, G.G. Mateos, L. Cámara
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引用次数: 0
Abstract
Two experiments, using the same protocol and experimental procedures, were conducted to study the effects of whole wheat (WW) supplementation to diets varying in energy and nutrient density, on gastrointestinal tract development and growth performance from hatch to 40 days of age of either Ross 308 or Cobb 500 broilers. The experimental design was completely randomized with 6 treatments organized as a 2 × 3 factorial with energy and nutrient density of the diet (low; LD vs. high; HD) and WW supplementation (control vs. low vs. high) as main effects. Each treatment was replicated 6 times and the experimental unit was a pen with 16 chicks. The feeding program consisted of three phases in which the HD diets contained 0.419 MJ AMEn/kg and 5 % digestible lysine more than the LD diets. In addition, the LD and HD diets were supplemented with 30 g WW/kg from 0 to 14 days and either 75 or 150 g WW/kg from 15 to 40 days of age. At 40 days of age, broilers fed the HD diets were heavier and had better feed and energy conversion ratio (P < 0.100), in both experiments, than broilers fed the LD diets. Whole wheat supplementation increased the weight and decreased the pH of the gizzard (P < 0.05), but impaired BW gain and feed efficiency (P < 0.01). In summary, an increase in diet density improved broiler performance of both strains from 0 to 40 days of age with opposite effects observed with WW supplementation.
期刊介绍:
Animal Feed Science and Technology is a unique journal publishing scientific papers of international interest focusing on animal feeds and their feeding.
Papers describing research on feed for ruminants and non-ruminants, including poultry, horses, companion animals and aquatic animals, are welcome.
The journal covers the following areas:
Nutritive value of feeds (e.g., assessment, improvement)
Methods of conserving and processing feeds that affect their nutritional value
Agronomic and climatic factors influencing the nutritive value of feeds
Utilization of feeds and the improvement of such
Metabolic, production, reproduction and health responses, as well as potential environmental impacts, of diet inputs and feed technologies (e.g., feeds, feed additives, feed components, mycotoxins)
Mathematical models relating directly to animal-feed interactions
Analytical and experimental methods for feed evaluation
Environmental impacts of feed technologies in animal production.