Responses of male growing broilers to increasing levels of balanced protein offered as coarse mash or pellets of varying quality (original) (raw)
Related papers
The interactions between balanced protein level and feed form in broiler production
In two feeding trials with 14-35 days old male broilers the effects of increasing levels of balanced protein (90-120% of Dutch recommendation) offered in coarse mash (with variable and non-variable particle size distribution) and pelleted diets (good and poor quality) on various performance criteria were examined. Feed intake generally decreased with increasing balanced protein levels. However, highest feed intake was observed with good pellets which was then reflected by higher weight gain and - at least in one trial - by better feed conversion ratio compared to the bad quality pellets or mash treatments. Increasing balanced protein levels only slightly affected weight gain when fed as mash. For the poor pellet treatments there was a clear linear response but on a lower performance level as good pellets. Data suggest that optimum dietary amino acid levels vary with feed form and pellet quality.
Performance of broilers fed mash or pelleted diets containing different soybean meal particle sizes
Pesquisa Agropecuaria Brasileira, 2021
The objective of this work was to evaluate the effect of different soybean meal particle sizes in pelleted or mash diets on broiler performance. A total of 1,440 male Cobb500 broilers, with 1 to 35 days of age, were evaluated. The experimental design was completely randomized, in a 2x4 factorial arrangement, consisting of two feed physical forms and four soybean meal particle sizes (625, 775, 1,053, and 1,406 μm), totaling eight treatments, with nine replicates of 20 birds each. Feed intake, weight gain, and feed conversion ratio were evaluated. There was a significant interaction between diet physical form and soybean meal particle size. From 1 to 21 days of age, the lowest feed intake and weight gain values were obtained with the mash diet containing 1,406 μm soybean meal particle size. From 1 to 35 days of age, the greatest weight gain is achieved when broilers are fed the pelleted diet with 1,406 μm soybean meal particle size.
Effect of high protein supplementation on growth and nutrient digestibility of broiler
Bangladesh Journal of Animal Science, 2017
This study was undertaken to compare the growth performance and nutrient digestibility (energy, protein and amino acid) of broilers fed diets containing only vegetable protein (soybean) with birds that received Pro-EL as protein supplement in their diets. Day-old male broiler chicks (n=60; Cobb 500) were randomly distributed into 2 dietary treatment groups, namely control (T1) and supplemented (T2) diets, with 5 birds per replication in a CRD. Birds had a free access to iso-caloric and iso-nitrogenous starter diets in cages up to 21d. The results of FI, LW, LWG and FCR of broilers up to 21 days were poorer (P<0.01) on T2 diet than the broilers fed on T1 diet. The ileal nutrient digestibility of GE and CP was identical (P>0.05), but the majority of the AAs digestibility values were influenced (P<0.05; P<0.01) by
Increased dietary balanced protein levels at varying length of application in 1-14 days old broilers
In the present trial increasing levels of balanced protein (BP; 100 (control), 115, 130, 145, 160% of recommendation) were fed from day one either for two, four, eight, or twelve days to male broilers (control + 4 x 4). After feeding the experimental diets dietary BP was reduced to the control level. This was done in two steps (2-day transition period) in order to avoid too strong changes in amino acid supply. Increasing BP levels non-linearly improved weight gain and feed conversion. This effect was most pronounced when experimental diets were fed for 12 days (p<0.05). Feeding increasing BP levels for two or four days had no effects on weight gain and feed conversion ratio. On day 14 two birds per pen were selected for dissection. Weights of the empty small intestine were determined. Enhancing the length of feeding the experimental diets from 2 to 12 days significantly increased the relative weight of the duodenum and jejunum (% of body weight) whilst dietary BP had no effect. H...
Effect of Dietary Protein/Energy Combinations on Male Broiler Breeder Performance
Acta agriculturae …, 2008
A study was conducted to evaluate the effect of crude protein level and low energy supply on broiler production parameters. Three hundred Ross 308-day-old male broiler chicks were divided in three basic groups and placed in three separate pens littered with wood shavings. Treatments consisted of a control diet (220 g/kg CP), the second diet with a crude protein diet (205 g/kg CP), and the third one with a crude protein diet (190 g/kg CP) with the same ratio 1: 573-575 KJ/kg crude protein and ME in starter (first 21 days). Finisher (22 day till end) control diet consisted of 200 g/kg CP, the second diet consisted of 185 g/kg CP, and the third one of 170 g/kg CP, with the ratio 1: 649-650 KJ/kg crude protein and ME. Feed intake tended to decrease with increasing the crude protein and energy. Feed conversion (g gain per g feed) improved as crude protein and energy increased. Muscle amount in groups K and P 1 was statistically much higher (P < 0.01) than in group P 2. Concentration of biochemical indicators showed less organism strain in groups fed on blends with less crude protein and energy.
Effect of various protein source feed ingredients on the growth performance of broiler
The study was conducted to evaluate the growth performance of broilers in response to various percentages of animal protein (A.P) and plant protein (P.P) feed ingredients, kept at SAU, Tandojam. One hundred twenty 120 day old mixed chicks (male and female) were purchased for 42 days. Initially weighed and randomly divided in to 4 equal groups i.e. A, B, C, and D, each group having 30 chicks. They were fed different rations containing various percentages of A.P and P.P feed ingredients sources. Group A containing 20% A.P and 80% P.P (control), while group B, C and D were given 30/70, 40/60, and 50/50 percentages of A.P and P.P feed ingredients, respectively. It was noted that the different percentage of (A.P and P.P) animal protein and plant protein sources have significant (P<0.05) effect on the growth and economic parameters of broiler, but non-significant effect on edible and non-edible internal organs. The feed intake of broiler in groups A, B, C and D was 4203.37, 4240.21, 4283.98 and 4396.62 g/b; water intake (P<0.05) of broiler was 9.46, 9.51, 10.06 and 10.45 liter/b, respectively. Average live body weight (P<0.05) of broilers in groups A, B, C and D was 1896.25, 1952.39, 2022.32 and 2116.97 g/b; Feed conversion ratio was 2.03, 1.99, 1.93 and 1.84. Average carcass weight was 1138.80, 1176.60, 1252.20 and 1313.60 g/b; dressing percentage was 60.12, 61.88, 62.57 and 63.22; heart weight was 10.60, 11.00, 10.80 and 10.20 g/b; gizzard weight 56.40, 57.40, 58.80 and 59.20 g/b; liver weight 36, 38.40, 38.80 and 39 g/b and intestine weight 132.90, 137.20, 138.60 and 143.40 g/b, respectively. With increasing protein ratio of animal protein in broiler ration, there was significant (P<0.05) increase in feed and water consumption of broiler. It was observed that animal protein and plant protein percentages of 50:50% proved to be the most effective to increase broiler live body weight, improve feed conversion ratio, carcass quantity as well as net profit per broiler basis. However, there was no association of animal protein and plant protein source on the mortality rate of experimental broiler. It was concluded that 50:50 percentages of A.P and P.P feed ingredients could be considered as an optimum ratio for better broiler growth and economic profitability
Effectiveness Evaluation of Use of Various Protein Feeds for Broiler Chicken Feeding
Annals of Animal Science, 2019
The purpose of this paper was to assess the suitability of various protein feeds in broiler chicken feeding. The study covered 160 birds split into 5 equipotent groups (SBM, EFFS, RFFS, EL, DDGS). Four protein feeds were an experimental factor: extruded full-fat soybean (EFFS group), raw full-fat soybean (RFFS group), extruded lupine (EL group) and distillers dried grains with solubles (DDGS group) that were added to starter rations in an amount replacing 30%, and in grower and finisher rations 50% of extracted soybean meal protein. Results showed that after replacing an identical amount of extracted soybean meal protein with protein from extruded soybean or DDGS in chicken rations, the final body weight and feed conversion ratio were similar to those of birds from the control group. Deterioration (P≤0.01) in the above-mentioned parameters was observed for chickens fed with rations containing raw soybean or extruded lupine. Birds that were given rations containing raw soybean (RFFS ...
Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca. Animal Science and Biotechnologies, 2013
The aim of study was to evaluate the effects of three dietary protein levels on body composition, plasma metabolic profile and litter composition of broilers at 42 days of age. One-day-old unsexed Cobb 500 broilers (n=600) were randomly assigned in 3 groups with 4 replications per treatment. Three diets were formulated for each growth phases, to contain 3 levels of protein: high protein (HP), medium protein (MP) and low protein (LP). The diets were isocaloric, with similar content of digestible sulphur amino acids, lysine, calcium and available phosphorus. The empty body weight (BW) of broilers was influenced by the dietary treatments (+ 8% in HP, respectively - 7.7% in LP vs. MP; P 0.05). In general, plasma biochemical parameters were not influenced by the dietary protein levels (P>0.05). In conclusion, low protein diets can support similar quality performance that high or medium diets when the quality ingredients are used. The lower dietary protein level resulted in reduced nit...
A total of 420 21-day-old broilers were wing banded and randomly distributed among 60 cages of 7 birds per cage during days 21-37 of age. A factorial design (4×3) was used in which there were four feed forms (mash vs. pellet diet with diameter 2-2 mm, 2-3 mm and 3-3.5 mm, respectively) and three enzyme treatments (unsupplemented, phytase, phytase plus multi-enzyme). Each treatment was replicated 5 times with 7 broilers per replicate. Body weight gain of broilers fed 2-3 mm-diet was significantly greater than that of those fed mash diet and 2-2 mm or 3-3.5 mm pellet-diet. Feed conversion ratio was the best in broilers fed 2-3 mm and 3-3.5 mm pellet-diets. However, feed intake was significantly lower in broilers fed pellet-diets than that of those fed the mash diet. The production index and economic efficiency were significantly higher in groups fed 2-3 mm pellet diameter compared to those fed 2-2 mm and 3-3.5 mm pellet diets. Digestibility of crude protein, ether extract, crude fibre and crude ash were significantly and similarly greater in groups fed pellet diets in comparison with those fed mash diet. Enzyme supplementations significantly and similarly increased growth and production index whereas improved feed conversion ratio and economic efficiency than the control group and this concurred with greater digestibility of crude protein, ether extract and crude ash. However, multi-enzymes plus phytase induced greater effect on the production and economic traits than phytase alone showing synergetic effects. Pellet diet at 2-3 mm supplemented with multi-enzyme plus phytase resulted in the highest performance and nutrient digestibility of broilers during day 20-37 d of age.
Animal, 2020
Feed form is well recognized to improve broiler performance, specially by increasing feed intake (FI). However, when different diet energy levels are used, the results differ in the literature. Therefore, this experiment was conducted to evaluate the influence of feed form and dietary metabolizable energy (ME) levels on broiler performance, carcass yield and on the digestibility of DM, CP, starch and gross energy. In total, 1152 male Cobb 500 broilers were evaluated between 35 and 47 days. The birds were distributed according to a completely randomized design in a 2 × 4 factorial arrangement, consisting of two feed forms (mash or pellet) and four ME levels (12.73, 13.06, 13.40 or 13.73 MJ/kg), totaling eight treatments with eight replicates of 18 birds. Broilers fed the lowest ME level presented the lowest weight gain (WG) and worst feed per unit gain (P < 0.01). Metabolizable energy intake increased (P < 0.01) with progressive increments of ME, which, however, did not affect ...