Effects of intensity and duration of quantitative restriction of feed on broiler performance

Abstract

ABSTRACT. This study was carried out to evaluate the effects of physical feed restriction method with different intensity and duration on broiler performance. One hundred and fifty Ross-breed 308 male broiler chicks in a completely randomized design were divided into five experimental treatments. The treatments included physical limitations by 25% or 50% of recommended amount on feed of broilers in two periods of 7 or 14 days. One control group was used fed ad libitum. Each limitation's severity level was applied in τηρεε replications of 10 birds. All experimental treatments before and after the limitation period until slaughter (day 42) were fed ad libitum. The results showed that in total period broilers under the physical limitation of feed had significantly lower feed intake than controls (P < 0.05). In this research, methods and levels of physical restriction intensity and duration of feed had no significant effect on body weight for the whole experimental period. Methods and levels of food restriction severity and duration had significant effect on feed efficiency (P < 0.05).

Effects of physical form of diet and intensity and duration of feed restriction on the growth performance, blood variables, microbial flora, immunity, and carcass and organ characteristics of broiler chickens

“…Conversely to Escherichia coli and total anaerobic bacteria, lactobacillus count could be considered as an index of healthy gut microflora (Cengiz et al, 2012). Inconsistent with the results of Jahanpour et al (2014), the effect of feed restriction on cecal microflora was very limited in our study. Indeed, the intensity of feed restriction of 25% reduced the count of Escherichia coli in comparison with the feed restriction of 12.5% (P¼ 0.04).Total aerobic bacteria count was lower in broiler chicken feed-restricted for 14 d than those restricted for 7 d. Also, the interaction of diet form and duration and intensity of feed restriction was observed (P ¼0.04).…”

Evaluación de los efectos de la suplementación de aceite de pescado y té verde en la microflora de la molleja, íleon y ciego en pollos de engorde

“…MRS agar (Man Rogosa Sharpe agar, 1.10660.500) to culture lactic acidproducing bacteria, MacConkey agar (105465.0500) to culture coliforms and intestinal negative lactose bacteria was used. Also Nutrient agar (1.05450.0500) was used to culture total aerobic bacteria counts, respectively (Dibaji et al, 2014;Jahanpour et al, 2014).…”

Feed Restriction Induced Changes in Behavior, Corticosterone, and Microbial Programming in Slow- and Fast-Growing Chicken Breeds

“…A previous study indicated that laying hens undergoing feed restriction during the molting process had decreased microbial diversity, smaller Lactobacillus populations, and higher sensitivity to colonization by Salmonella [ 23 ]. In broilers, studies on the effect of feed restriction on the gut microbiota have been ambiguous [ 24 , 25 ]. It is probable that feed restriction, as a stressor, would alter gut microbial composition in broilers as well as local breeds.…”