Productive Performance and Egg Quality of Brown Egg-Laying Hens in the Late Phase of Production as Influenced by Level and Source of Calcium in the Diet

Safaa, H. M.; Serrano, Martina Pérez; Valencia, D. G.; Frikha, Mohamed; Jiménez-Moreno, E.; Mateos, Gonzalo González

doi:10.3382/ps.2008-00110

Cited by 83 publications

(60 citation statements)

References 29 publications

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“…Table 3 -Mean (± standard error) feed intake (g/bird d) and the egg production (%) from 33 to 48 weeks in response to methionine + cystine (met+cys) intake The effect of met+cys intake on the feed conversion per mass (P<0.001) was also observed in other studies (Togashi et al, 2002;Jordão Filho et al, 2006;Safaa et al, 2008). This variable depends on feed intake and egg production, which was influenced by the different met+cys intakes (Togashi et al, 2002).…”

Section: Resultssupporting

confidence: 56%

Response of laying hens to methionine + cystine intake by dilution technique

et al. 2015

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-The objective of this study was to measure the response of Dekalb White laying hens to different intakes of digestible methionine + cystine (met+cys) to optimise their performance. Two hundred eighty-eight Dekalb White laying hens, ranging in age from 33 to 48 weeks, were used in the study. The birds were randomly allocated into eight treatment (levels of met+cys and the control treatment) groups with six replicates of six hens per unit. The experimental diets consisted of seven increasing levels of met+cys (1.37, 2.75, 4.14, 5.51, 6.89, 7.92 and 8.95 g kg −1 ) and were prepared using a dilution technique. A control treatment was used to confirm that the limiting response was due to met+cys intake. Egg production, feed intake, egg weight, egg mass and feed conversion per mass were measured. The data were analysed with repeated measures and regression analyses using Broken Line and Quadratic models, as well as using the combination of both models. The different met+cys intakes influenced the studied variables; all the variables except feed conversion per mass were significantly different between the periods and levels. The digestible met+cys intakes based on the association of the Broken Line and Quadratic models to optimise the birds' response to egg mass are 671 mg/bird d for 33 to 36 weeks, 728 mg/bird d for 37 to 40 weeks, 743 mg/bird d for 41 to 44 weeks, and 770 mg/bird d for 45 to 48 weeks.

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Section: Resultssupporting

confidence: 56%

Response of laying hens to methionine + cystine intake by dilution technique

et al. 2015

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“…For the determination of the contents of calcium and phosphorus in the shell, mineral solution was prepared by means of wet procedures. From the mineral solution, the calcium contents were determined through atomic absorption spectrometry and the phosphorus contents by colorimetry, according to the methodology described by Silva & Queiroz (2002). The results were expressed on a dry matter basis.…”

Section: Methodsmentioning

confidence: 99%

Calcium levels and calcium: available phosphorus ratios in diets for white egg layers from 42 to 58 weeks of age

et al. 2012

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-The experiment was conducted to determine the nutritional requirement of calcium and the best calcium: available phosphorus ratio for commercial layers at the post-laying peak. A total of 324 Hy-Line W-36 laying hens were utilized in the period from 42 to 58 weeks of age, distributed in a completely randomized design in a 3 × 3 factorial arrangement, composed of three levels of calcium (39, 42 and 45 g/kg) and three calcium:phosphorus ratios (12.12:1; 10.53:1; and 9.30:1), totaling nine treatments with six replications and six birds per experimental unit. There was no significant effect from the calcium levels × calcium:phosphorus ratio interaction for any of the variables studied. The calcium levels and the calcium: phosphorus ratios did not affect the variables performance or egg and bone quality. At the evaluation of the calcium:phosphorus balance, as the levels of calcium of the diet were raised, the intake of calcium and phosphorus and the contents of mineral matter and calcium in the excreta increased linearly, and the retention of calcium by birds decreased linearly. With the reduction of the calcium:phosphorus ratios of the diet, intake, retention and excretion of phosphorus by layers increased. Diets containing calcium at 39 g/kg and a calcium:phosphorus ratio of 12.12:1, corresponding to an increase in calcium of 3.51 g/bird/day and available phosphorus of 289 mg/bird/day, meet the requirements of calcium and available phosphorus of white egg layers in the period from 42 to 58 weeks of age.

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“…Shell color was evaluated using a Minolta colorimeter (Chroma Meter Model CR-200, Minolta Corp., Ramsey, NJ) and the Hunter color values [L* (lightness), a* (green to red) and b* (blue to yellow)] were recorded. Egg shell strength, expressed in g/cm 2 , was evaluated using a press meter (Egg Force Reader, SANOVO Technology A/S, Odense, Denmark) as indicated by Safaa et al (2008). Shell thickness was measured at the two pole ends and at the middle section of the egg shell with a digital micrometer (model IT-014UT, Mitotuyo, Kawasaki, Japan) and the average of the three measurements of each of the 12 eggs was used for further analyses.…”

Section: Measurementsmentioning

confidence: 99%

Influence of feed form and energy concentration of the rearing phase diets on productivity, digestive tract development and body measurements of brown-egg laying hens fed diets varying in energy concentration from 17 to 46 wk of age

Saldaña

Gewehr

Guzmán

et al. 2016

Animal Feed Science and Technology

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a b s t r a c tThe influence of feed form and energy content of the rearing phase diets on hen productivity, gastrointestinal tract (GIT) traits and body measurements was studied in brown-egg laying hens fed diets differing in energy concentration from 17 to 46 wk of age. The experiment was completely randomized with 12 treatments arranged as a (2 × 3) × 2 factorial with two feed forms (mash vs. crumbles) and three AME n concentrations of the rearing phase diets (low, medium and high) and two AME n concentrations (11.10 vs. 11.52 MJ/kg) of the laying phase diets. The AME n of the rearing phase diets differed in 0.42 MJ/kg in all three periods (1-5 wk, 5-10 wk and 10-17 wk of age). Hen productivity was determined from 17 to 46 wk and GIT and body traits were measured at 46 wk of age. The characteristics of the rearing phase diets did not affect any of the production, GIT traits or body measurements studied during the laying phase, except body weight gain (BWG) from 17 to 46 wk of age that was higher (P < 0.01) in hens that were fed mash during the rearing phase than in hens that were fed crumbles. An increase in the energy content of the laying phase diet from 11.10 to 11.52 MJ AME n /kg reduced feed intake (P < 0.001) and improved feed conversion ratio (P < 0.001) from 17 to 46 wk and reduced gizzard contents (P < 0.01) at 46 wk of age but did not affect any of the other production trait studied. The characteristics of the rearing and laying hen diets did not affect any of the GIT traits or body measurements at 46 wk of age. Body weight of the hens was positively (P < 0.001) related with body length, body mass index, tarsus length and tarsus diameter at this age. The data indicate that neither feed form nor energy concentration of the rearing phase diets affected subsequent hen performance. An increase in the AME n content of the layer diet from 11.10 to 11.52 MJ/kg decreased feed intake and improved feed conversion ratio but did not affect hen production or egg quality.

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Productive Performance and Egg Quality of Brown Egg-Laying Hens in the Late Phase of Production as Influenced by Level and Source of Calcium in the Diet

Cited by 83 publications

References 29 publications

Response of laying hens to methionine + cystine intake by dilution technique

Response of laying hens to methionine + cystine intake by dilution technique

Calcium levels and calcium: available phosphorus ratios in diets for white egg layers from 42 to 58 weeks of age

Influence of feed form and energy concentration of the rearing phase diets on productivity, digestive tract development and body measurements of brown-egg laying hens fed diets varying in energy concentration from 17 to 46 wk of age

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