Effects of quantitative feed restriction on the performance of broiler chickens (original) (raw)
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Arch. Zootec., 2014
Two hundred and sixteen unsexed 14 daysold Marshall broiler chicks were used in a 3×3 factorial experimental design to test the effect of restricting feed intake of birds by 0 %, 20 % and 40 % levels for 2, 4 and 6 weeks after two weeks of the starter phase. The unrestricted (control) treatments were fed ad libitum throughout the experiment. The experiment lasted for 42 days. Data were collected and calculated on weight gain, feed:gain, feed intake, mortality, proximate composition of meat and cost-benefit analysis. Data obtained were subjected to a 2-way analysis of variance. Results showed significantly higher (p<0.05) final weights in the unrestricted birds (control) compared to the restricted birds. Interaction between duration of restriction and level of restriction indicated that weight gain and feed intake significantly (p<0.05) reduced as duration and level of feed restriction increased. Feed:gain was significantly (p<0.05) different across the treatments with birds restricted at 40 % for 6 weeks having the best feed:gain (1.91). The mortality recorded was not significant (p>0.05) across duration and level of restriction. Abdominal fat decreased with increasing duration and level of restriction with birds on 40 % level and 6 weeks duration of restriction having the lowest fat content (0.20 %). Crude protein content of the breast muscle significantly increased while crude fat content of the breast muscle significantly decreased with duration and level of restriction. Crude fat content was lowest at 40 % level and 6weeks duration of feed restriction. As level and duration of feed restriction increased, feed cost/ kg reduced. Birds restricted at 40 % level for 2, 4 and 6 weeks durations respectively had better cost benefit than birds restricted at 0 and 20 % levels for 2, 4 and 6 weeks durations. It can be concluded that the best feed:gain, lower abdominal fat, higher protein and better cost benefit was achieved in birds restricted at 40 % for 6 weeks
EFFECT OF FEED RESTRICTION ON GROWTH PERFORMANCE AND ECONOMY OF PRODUCTION OF BROILER CHICKS
An experiment was conducted to determine the effect of feed restriction on growth performance and economy of production using One Hundred and Twenty (120) ANAK 2000 broi er chicks. The dietary treatments consisted of providing feed ad libitum (ull fed) and two feed restriction treatments restricting eed ng 80 % of ad libitum between 28 – 70 days of age (DOA); and for 28 – 47 DOA with re-alimentation to full fed 48-70 DOA. The three treatments were ident fied as D 1, D 2, and D 3 respectively. A one-way analysis of variance (ANOVA) in Completely Randomized Design (CRD) was used to analyze data collected on growth performance variables. A cost – benefit analysis was utilized for the economy of production. Analysis of results obtained revealed that final body weight and weekly weight gain of broilers on D 1 and D 3 were similar (P < 0.05) but differed from D 2 (P < 0.05). No sign cant d ference (P < 0.05) was found between D 2 and D 3 and between D 2 and D 1 in weekly feed intake and feed efficiency respectively. Feed efficiency was improved by restriction followed with re-alimentation. A reduced feed cost (N)/Kg weight gain, highest revenue and least cost-benefit rat o were obtained from reduced from birds on D 3.
Open Journal of Animal Sciences, 2021
The growth productivity of broilers is influenced by improving growth performance through improving body weight, average daily gain, and feed conversion rate. The objective of the study was to determine the effect of quantitative feed restriction duration on growth performance and carcass characteristics of broilers. A total of 144 day-old broiler chicks were reared in a deep litter system until slaughter at 42 days. Chicks were randomly allocated to three treatments which were replicated three times with 16 birds per replicate. The three treatments were the control (T1), one week of feed restriction (T2), and two weeks of feed restriction (T3). Birds were fed with starter, grower and finisher diets. The average daily gain (ADG), average daily feed intake (ADFI), and the feed conversion ratio (FCR) were computed for each week. Carcass weight and internal organs weights were measured. The body weight gained by the birds in T1 was similar to the birds that were restricted for a week. The treatments had a significant effect on the average daily gain in weeks 4, 5, and 6. The ADG for T2 was higher (P < 0.05) at week 5 after 1 week of restriction, than T1 and T3. The feed conversion ratio was significantly higher in T3 after 2 weeks of restriction. In T2 and T3, feed intake was significantly lower than in birds fed ad libitum at week 4 at the start of the treatment. There was no significant effect on the relative weights of heart weights, liver, gizzard, feet, and heads among the treatment groups except for intestine weight which was lower (P < 0.05) in T1 than T2 and T3. It was concluded that broilers that were restricted for one week had a positive result in growth performance. Feed restriction had minimal effect on the organ weights of broiler chickens.
VII Study of the effect of feed restriction on growth and performance of broilers
2015
In this study an experiment was conducted in a Completely Randomized Design experiment with 4 treatments×4 replication each replication was included 251-day broiler chicks and were raised in research farm of Karaj Islamic Azad University for 7 weeks. feed withdrawal (2 days off feeding in a week) and all of restriction methods (all of groups and at the end of total period 1 bird selected from each replication for carcass traits. The @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@@@@@ restriction showed the lowest feed cost per gain and abdominal fat of carcass and totally
The present review discusses the beneficial effect of early feed restriction program on improving feed efficiency, and lowering mortalities, metabolic diseases and fat accumulation in broiler chickens. This program reduced several metabolic disorders such as ascites, sudden death syndrome, heat stress mortality and leg abnormality. This program may improve drug metabolism and may change immune system in broiler chickens. The factors influencing the success of early feed restriction program included sex, method of feed restriction, strain, feed intake during refeeding, duration of feed restriction, initial age at which animals were restricted, length of time allowed for refeeding, type of refeeding diet, type of houses and the severity of feed restriction. The application of early feed restriction in the farm condition resulted in better profit for the farmers. The early feed restriction could be used as a tool in improving feed efficiency, lowering mortalities and fat accumulation in broiler chickens.
Pakistan Journal of Nutrition, 2012
This study was conducted to evaluate the effect of early feed restriction on growth performance and carcass characteristics in broiler chickens. A total of 800 1-d old broilers were randomly allotted to ad libitum and 3 feed-restricted treatments, each of which was replicated 8 times (25 birds per replicate) in a randomized complete block design. Broilers were feed-restricted between 8 and 14 d of age, and fed either control ad libitum diet (F100), 50% feed intake (FI50), 65% feed intake (FI65), or 80% feed intake (FI80). Results showed that body weight and weight gain were significantly (p<0.01) greater for FI100 in contrast to restricted groups. Feed intake was significantly (p<0.01) higher for FI65 at 21 d, while FI100 had a superior feed conversion (p<0.01). Abdominal fat pad weight was significantly (p<0.01) lower for the FI50 compared to the other treatments, while the control diet had a significantly higher (p<0.02) liver and heart weight. No significant differences were observed with regard to carcass yield, dressing percent, or gizzard weight.
Effect of quantitative feed restriction on broiler performance
The objective of the current study was to determine the effect of quantitative feed restriction on the performance of broilers. A total of 270 unsexed broilers were randomly allocated to three treatments: with no feed restriction (T1), one week (T2) and two (T3) weeks of feed restriction from 22 days of age and then fed ad libitum until the age of 42 days. Treatments were replicated three times with 30 birds per replicate. Birds were fed with starter, grower and finisher diets. The feed consumed and body weights were recorded every week from the third to the sixth week. The average daily gain (ADG), average daily feed intake (ADFI) and the feed conversion ratio (FCR) were computed for each week. At Week 6, body weights of T3 birds were similar (P>0.05) to those of T1 and T2 birds. There were also no treatment effects on the ADG at Week 6. In addition, no treatment effects (P>0.05) were observed on ADFI at each stage of growth. Since ADFI and FCR were similar among the three groups, it was concluded that feed restriction by limiting the time to eat was not successful. There was also no evidence of compensatory growth in the restricted groups.
International Journal of Poultry Science, 2009
An experiment was conducted to determine the effect of different feed restriction regimes during the starter stage (14-21 days) on productivity and carcass characteristics of male and female Ross 308 chickens. A 3 (feeding levels: ad-libitum intake, 50% ad-libitum intake and 75% ad-libitum intake) × 2 (male and female chickens) factorial arrangement in a complete randomized design was used. Feed restriction affected (p<0.05) live weight of chickens at the age of 21 days and male chickens were heavier (p<0.05) than females at the same age. Chickens on 75% ad libitum feeding attained complete compensation in live weight at 42 days of age while those on 50% ad libitum feeding did not. However, male chickens attained higher (p<0.05) live weights than female chickens at 42 days of age. It is suggested that 75% ad libitum restriction feeding during the starter stage from 14 up to 21 days of age may offer some economic advantage over ad-libitum feeding regimen, mainly by enhancing feed utilization. It may, therefore, be a useful nutritional strategy to reduce the cost of commercial starter grain based-diets.
1. An experiment was conducted with broiler chickens to determine the effects of different early food restrictions, strain (Ross 508 and Hybro G) and sex on performance, mortality, carcase composition and meat characteristics. 2. Birds were restricted to 80% or 90% of ad libitum intake for 4 d (80%-4 d-group and 90%-4 d-group, respectively) or 80% for 8 d (80%-8 d-group). All restrictions started on d 4. After the periods of restriction, all birds were fed ad libitum. 3. Only the 90%-4 d-group reached a final body weight not significantly different from, but lower than, the ad libitum group. The other restrictions were too severe to allow a sufficient 'catch-up'. 4. No significant differences in food conversion and total carcase fat content between groups were observed. Abdominal fat showed a tendency to increase due to the restrictions induced. 5. There was a slight trend towards a reduced mortality and of 'sudden death syndrome' but no clear effect of food restriction on number of chickens removed with leg problems. There was no significant decrease in uniformity of the flocks due to restriction. 6. The group 80%-8 d had a significant lower yield percentage. Cut-up parts and meat quality were not changed by restriction. Ross birds had a significantly higher proportion of breast meat than Hybro chickens. Meat of female chickens seemed to be paler than that of males, possibly because of the higher proportion of carcase fat. 7. Food restriction did not always give good results. However, a mild restriction (90% for 4 d) may offer some economic advantages over an ad libitum feeding regimen, mainly by reducing mortality.
Effect of feed restrictions on performance, blood variables and immunity of broiler chickens
Veterinarski arhiv
Genetic selection has led to an increase in performance and lean tissue deposition in broiler chickens which have become increasingly susceptible to disease. To reduce this susceptibility, various feed restriction programs have been proposed, albeit with highly variable results. This study investigated the effects of the duration and intensity of quantitative feed restriction in the early rearing period on the performance, blood parameters and immunity of broiler chickens. Two hundred and seventy chicks were randomly assigned to a 4 × 2 factorial arrangement to examine the effects of 2 durations (7 and 14 d) and 4 levels of feed restriction (5, 10, 15, and 20%). One control (Con) group was included. Feed intake (FI) and weight gain (WG) were recorded, and the feed conversion ratio (FCR) calculated weekly. At slaughter (42 d of age), blood was collected, and the carcass composition and characteristics of the gastrointestinal tract were assessed. In comparison with the Con, feed restrictions improved FCR (P<0.01), increased relative weight (RW) of the breast (P<0.05), and abdominal fat (P<0.01), and reduced the RW, as well as the dimension of some gut segments. Feed restriction showed limited influence on blood variables, the humoral immune response to Influenza and Newcastle disease vaccinations, and on response to injection of sheep red blood cells. Feed restrictions up to 20% for 7 or 14 d are an appropriate strategy to improve the FCR and the RW of breast, with a limited effect on blood variables, and without significant effects on the immunity of broiler chickens.