Effect of dietary lysine to crude protein ratio on performance of male Ross 308 broiler chickens (original) (raw)
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Poultry Science, 2016
Three experiments were carried out to estimate the optimal ratios of digestible phenylalanine + tyrosine (Phe + Tyr), histidine (His), and leucine (Leu) relative to digestible lysine (Lys) for performance and carcass criteria of Cobb-500 broilers from 8 to 17 d of age. In each experiment, 160 male chicks were allocated to a completely randomized experimental design with eight replicate pens, each receiving five dietary treatments. A common, semi-purified basal diet was formulated to meet all dietary recommendations except for those of the tested amino acids (i.e., Phe + Tyr, His, and Leu). Growth performance and carcass characteristics data were analyzed using various requirement-estimation models, including 95% of the quadratic regression, linear response plateau (LRP; i.e., stepwise regression), LRP-to-quadratic regression ratio; and quadratic broken line (QBL). Graded digestible Phe + Tyr ratios elicited a quadratic response (P < 0.05) in body weight gain and linear responses (P < 0.05) in breast and breast fillet weights. Linear effects (P < 0.05) were also observed when graded ratios of digestible His were fed for feed intake and weight gain, and quadratic responses (P < 0.05) were noted for feed conversion ratio and breast and breast fillet weights and yields. Graded Leu ratios elicited quadratic responses (P < 0.05) in feed intake, weight gain, and breast and breast fillet weight and yield. Based on growth and carcass parameters, the estimated ideal digestible ratios of Phe + Tyr, His, and Leu relative to digestible Lys were 112, 38, and 104%, respectively, for broiler chicks raised from 8 to 17 d of age.
African journal of agricultural research
An experiment was conducted to evaluate crude protein level on lysine requirements and performance of male broiler chickens. From 21 to 42 day old chicks were fed one combination of dietary lysine and CP (18, 20 and 22% crude protein and 0.08, 0.9, 1 and 1.1% lysine) in a diet containing 3.200 kcal/kg ME. Variables measured consisted of feed intake, body weight gain, feed conversion ratio, percentage of fat pad carcass, breast and thigh weight. The lysine requirement was estimated by broken line methodology based on body weight gain, feed conversion ratio, carcass and breast weight recorded in the grower period. There were significant effects of crude protein level on body weight gain, feed intake, feed conversion ratio and percentage of fat pad that existed. The body weight gain and feed intake increased and percentage of fat pad decreased as crude protein increased in the diet. However, increasing lysine in the diets significantly increased body weight gain, breast meat, thigh and...
Animal Research, 2005
The effects of two dietary crude protein levels (H = 22.5 and L = 17% on average) and four lysine levels (0.56, 0.66, 0.76 and 0.86%) were compared in a 2 × 4 factorial design, on growth and carcass composition of slow growing broilers (Label) during the finishing period (42-77 days). There were six pens of 28 male chickens per treatment. In each pen, 14 chicks received a stimulating starter diet (13 MJ•kg-1 , 1.4% lysine) and the other 14 chicks a poor starter diet (12.1 MJ•kg-1 , 1.1% lysine) from 0 to 6 days of age. The starter regime had no significant effect on subsequent performances and no interaction with the other traits. During the finishing period, lysine deficiency at 0.56% induced feather pecking and cannibalism resulting in more severe mortality with the H (33.9%) than the L diet (5.4%). Growth, feed conversion and breast meat yield were significantly improved by lysine supplementation up to 0.76% in the diet whatever the protein level. However, the deterioration of growth and feed conversion for lower lysine levels was more severe for the H diet compared to the L diet (interaction P < 0.001). The H fed chickens had less abdominal fat (3.3%) than the L fed chickens (4.3%) without a significant effect of the lysine level. The lysine requirement measured by regression (exponential and ascending line with a plateau) was close to 0.68%. High dietary protein levels associated with subdeficiency in lysine might favour cannibalism in label chickens during the finishing stage. meat chicken / growth / protein / lysine / body composition / cannibalism
Effects of quantitative feed restriction on the performance of broiler chickens
Agrieast (Chenkalady), 2017
A study was conducted to evaluate the effect of quantitative feed restriction on the performance and the production cost of broiler chickens. A total of 120, Indian River, day-old broiler chicks were randomly allocated into four dietary treatment groups such as 100% diet as control treatment and 90%, 80% and 70% diets, in floor pens. All treatments were replicated thrice with 10 birds each in a Completely Randomized Design. Broiler chickens were fed broiler starter diet from day 1 to day 21 and broiler finisher diet from day 22 to day 42. The results revealed that the body weight gain in the birds fed with 90% diet was significantly higher than those of control diet during finisher and overall phases and vice-versa during starter period. The feed intakes of birds were significantly decreased with the severity of feed restriction during all periods. However, significantly the lowest overall feed conversion ratio was reported in the birds fed with 70% diet. Furthermore, higher relative liver and lung weights were observed in the control treatment while they had lower relative heart weight. The spleen was significantly increased in the birds fed with 90% diet. It could be concluded that giving 90% of the recommended diet to the broiler chickens increases growth, immunity and income.
IOSR Journals , 2019
Poultry development plays a crucial role in increasing egg and chicken meat production. Poultry rearing provides income and employment to large number of people. The objective of this investigation is to determine the performance of broiler chicken when fed with diets containing different combinations of energy and protein. Total of 200 (day-old chicken) broiler chickens of a commercial strain randomly selected for three different experiments and feeding with experimental rations. The birds rearing period was 6 weeks, the live body weight performance and health condition were measured by weekly. For each experiment Eighty (80) 1-day-old male broiler chickens of a commercial strain were selected in four groups with control including supplements diet treatments. Each treatment group of 20 birds was allocated. In the first and second weeks of feeding the body weight of broiler chicken was significantly increased by corn (starch rich supplements), however the body weight in week 4 and 5 was significantly increased by protein supplements particularly alfalfa. Also feed additives had significantly effect on growth performance where mortality rate was zero.
The study was conducted to investigate the effect of feeding different levels of crude protein (CP) but similar levels of energy on nutrients intake and growth performance traits of Koekoeck chickens. Two hundred chicks irrespective of their sexes were randomly assigned to 4 treatment diets (T) containing 16% CP (T1), 18% CP (T2), 20% CP (T3) and 22% CP (T4). Each treatment groups were replicated 4 times with ten chicks per replicate. The feed (offered and refusal) was measured using a digital balance every morning before offering the daily feed. The body weight was assessed on a weekly basis. The results indicated that there was a significant (P<0.05) increase in feed consumption as the level of protein increased in the diet. The dry matter intake was (P<0.05) higher for chickens receiving T3 and T4 diets. The overall feed consumption was higher among the chickens receiving T3 and T4 diets, while it was the lowest among those receiving T1 diet. The result also indicated that the intake of protein was (P<0.05) different and positively associated with the intake of CP. The intake of calcium was higher for chicks fed on T2 diet as compared to those receiving T3 diet. Chickens receiving T1 diet had a significantly lower energy intake when compared to those reared on T4 diet. Whereas chickens reared on diets containing T2 and T3 diets had intermediate value between the two. The results indicated that by increasing in the level of protein in the diets did not influence the overall body weight gain and final live weight of chickens. Though not significantly, the chickens reared on diets containing higher levels of protein (T4) showed poor growth performance, this may be attributed to differences in energy protein ratio among the diets. The Koekoeck chickens reached the highest growth rate at 9 th week and followed by 11 th and 13 th week of the experimental periods. The feed conversion ratio (FCR) showed no significant difference among the dietary treatment groups. However, the FCR improved numerically with increasing levels of protein in the diet. From the current work it can be concluded that 16% dietary CP is optimum for Koekoeck chickens. How to cite this article: Banerjee S, A Melesse, E Dotamo, K Berihun and M Beyan, 2013. Effect of feeding different dietary protein levels with Iso-Caloric ration on nutrients intake and growth performances of dual-purpose koekoeck chicken breeds. Int. J. Appl Poult. Res. 2(2): 27-32.
Poultry Science, 2006
Four experiments were conducted to evaluate variations in the digestible lysine (DLYS) requirement estimates of broilers due to rearing environment, sex, or growth performance during the starter period (7 to 21 d) and due to sex, growth, and carcass yield characteristics during the grower period (21 to 38 d). In the first 3 experiments, chicks were allocated to either battery or floor pens. The fourth experiment was conducted during the grower period with birds reared in floor pens only. All the studies used a lysine-deficient corn-soybean mealcorn gluten meal basal diet formulated to be isonitrogenous and isocaloric. Treatments consisted of 5 graded levels of DLYS varying from 0.70 to 1.21% in the first 3 experiments and from 0.73 to 1.13% in the fourth experiment. The DLYS requirement was estimated by brokenline methodology based on body weight gain (BWG) and gain:feed ratio (G:F) for the starter period, and the same variables plus breast meat yield for the grower period.
Biotechnology in Animal Husbandry, 2007
The aim of this work is to examine the influence of various systems of diet on production parameters of broilers from two different genotypes. The examination was done in a production farm for intensive fattening of broilers in R. Macedonia. Broilers from genotype Hubbard Classic and Cobb 500, 2400 one-day chickens all together sorted out in 16 separated and marked boxes have been used as a material. In each box were put 150 chickens, which contained four different treatments (two different hybrids x two diets) and four repetitions in one turns. Starter mixture was used during I-II weeks, grower for III weeks, then finisher 1 from IV-VI week, and finisher 2 for VII weeks of broilers fattening. Chemical structure of the first mixture (diet 1) had higher level of energy and proportion E:P, while the second mixture had higher level of proteins and lower values of proportion E:P. During the fattening the production parameters of the examining chickens: body mass, daily gain, feed consum...
Economically optimal dietary crude protein and lysine levels for starting broiler chicks
Poultry Science, 2005
An experiment was conducted to quantify the growth response of broiler chicks to cumulative dietary lysine and CP intakes. From d 7 to 17, chicks were fed one combination of dietary lysine and CP (17, 20, 23, and 26% CP and 3.5, 4.0, 4.5, and 5.0 g lysine per 100 g of CP) in a diet containing 3,200 kcal/kg ME. There were significant linear and quadratic effects of dietary CP intake and quadratic effects of dietary lysine intake on body weight gain (BWG), confirming that a diminishing response (marginal BWG decreased as intake of dietary lysine increased) existed (R 2 = 0.92 and 0.95, respectively). A significant interaction between dietary CP and lysine for BWG complicates economic modeling because responses must be considered together. A quadratic growth