Digestible lysine for broiler chickens with lower genetic potential grown on free-range system

Nascimento, Eduardo Souza do; Lima, Cristina Amorim Ribeiro de; Brasil, Ronner Joaquim Mendonça; Machado, Noédson de Jesus Beltrão; Dilelis, Felipe; Corrêa, Gerusa da Silva Salles

doi:10.1590/1413-70542016404009316

Cited by 2 publications

(2 citation statements)

References 19 publications

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“…The best weight gain (1007 g) and feed conversion ratio (2.87) results were obtained at estimated dietary digestible lysine levels of 1.162 and 1.126%, respectively (Table 10). These results are consistent with those obtained by Nascimento et al (2016), who evaluated the effects of increasing digestible lysine values on the performance of broilers of the slow-growing strain Embrapa 041 during the period of 35-84 days of age and estimated digestible lysine requirements of 1.196 and 1.078% for optimal weight gain and feed conversion ratio, respectively. Table 7 -Feed intake, weight gain, feed conversion ratio and lysine intake and utilization efficiency of slow-growing broilers in experiment 3 (70 to 84 days old).…”

Section: Performance and Carcass Traitssupporting

confidence: 90%

Digestible Lysine Requirements the Performance, Carcass Traits and Breast Meat Quality of Slow-Growing Broilers

Brasil

Lima

Machado

et al. 2018

Braz. J. Poult. Sci.

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Three experiments were conducted to estimate the digestible lysine requirements of slow-growing broilers on their performance, carcass traits, and breast meat quality. Different broilers were evaluated in each experiment. In Experiment 1, broilers were evaluated from 29-49 days of age (grower phase I), in Experiment 2, from 50 to 69 days old (grower phase II), and in Experiment 3, from 70-84 days old (finisher phase). A completely randomized design with five treatments of four replicates each was applied in all experiments. The following dietary digestible lysine values were investigated: 0.871, 1.011, 1.151, 1.291 and 1.431% in Experiment 1; 0.803, 0.943, 1.083, 1.223 and 1.363% in Experiment 2; and 0.766, 0.906, 1.046, 1.186 and 1.326% in Experiment 3. In all three experiments, digestible lysine values quadratically affected feed intake, weight gain, and feed conversion ratio. Lysine intake linearly increased with increasing digestive lysine values, whereas lysine utilization efficiency linearly decreased. Lysine requirements for maximum feed intake (1.298, 1.109, 1.150%), weight gain (1.183, 1.199, 1.162%), and feed conversion ratio (1.203, 1.162, 1.126%) were estimated in Experiments 1, 2 and 3. Digestible lysine requirement for carcass yield were estimated as 1.162, 1.068 and 1.107% in experiments 1, 2 and 3, respectively. Lysine influenced the physical-chemical parameters broiler breast meat. Digestible lysine levels of 1.203, 1.162 and 1.126% are recommended in the diets of Redbro Plume broilers during the phases 29-49, 50-69 and 70-84 days of age to optimize feed conversion ratio.

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Section: Performance and Carcass Traitssupporting

confidence: 90%

Digestible Lysine Requirements the Performance, Carcass Traits and Breast Meat Quality of Slow-Growing Broilers

Brasil

Lima

Machado

et al. 2018

Braz. J. Poult. Sci.

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“…There was no influence of the feed energy level on the carcass yield. Nascimento et al (2016) found a quadratic effect on the carcass weight but did not observe significant results for the carcass yield in slow-growing broilers raised in a free-range system. Mendonça et al (2008), working with "Isa Label" males, also found no significant differences in the carcass yield when the feed energy level was varied from 70.73 % to 72.09 %.…”

Section: Results and Discussion Experiments 1 -Metabolizable Energy Inmentioning

confidence: 68%

Metabolizable energy for broilers with different genetic growth potentials under a free-range system

Massi¹,

Lima²,

Machado³

et al. 2018

Bol. Ind. Anim.

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The objective of this study was to evaluate the effects of different levels of metabolizable energy (ME) on performance parameters and carcass characteristics in slow-growing (experiment 1) and fast-growing (experiment 2) broilers in a free-range system. Were evaluated broilers from 35 to 70 days old in experiment 1 and 28 to 49 days old in experiment 2. A completely randomized experimental design was employed in both experiments, with five treatments and four replicates totaling 20 experimental units containing 15 broilers each. The treatments consisted of rations that had increasing metabolizable energy levels obtained by the substitution of soybean oil in the basal diet for the inert sand ingredient. The metabolizable energy levels studied in experiment 1 were 2700, 2800, 2900, 3000 and 3100 kcal/kg, and in experiment 2, they were 2800, 2900, 3000, 3100 and 3200 kcal/kg. In experiment 1, there was a linear (P<0,05) reduction in consumption with the increase in the metabolizable energy level, and a quadratic effect (P<0,05) on the feed conversion was observed, which was estimated as 3046 kcal/kg the level that resulted in a better feed conversion of 2.648. In experiment 2, the metabolizable energy level exerted a significant quadratic effect (P<0,05) on the feed intake and metabolizable energy consumption, with a maximum feed intake (3361.27 g) estimated for 2842 kcal/kg, and the maximum energy intake was estimated at 10020 kcal. The feed conversion decreased linearly (P<0,05) with there was an increase in the studied levels. For broilers reared in a free-range system, for better feed conversion, the recommended metabolizable energy levels are as follows: for slow-growing broilers from 35 to 70 days of age, 3046 kcal/kg, and 3200 kcal/kg is recommended for fast-growing broilers from 28 to 49 days of age.

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Digestible lysine for broiler chickens with lower genetic potential grown on free-range system

Cited by 2 publications

References 19 publications

Digestible Lysine Requirements the Performance, Carcass Traits and Breast Meat Quality of Slow-Growing Broilers

Digestible Lysine Requirements the Performance, Carcass Traits and Breast Meat Quality of Slow-Growing Broilers

Metabolizable energy for broilers with different genetic growth potentials under a free-range system

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