Abstract:This study aimed at evaluating the effect of dietary calcium levels and the replacement of calcium sources with different particle size compositions on the performance and egg quality of brown layers in their second egg production cycle. A randomized block experimental design was applied with 12 treatments in a 3x4 factorial arrangement: three calcium levels (2.6, 3.2, 3.8 %) and four combinations of calcium sources (1- 100% fine limestone (FL), 2- 50% FL + 50% coarse limestone (CL), 3- 50% FL and 50% oyster s… Show more
“…These ranged between 33% and 35%, and show small variability for samples between farms. These values were slightly lower than those reported by other authors, averaging percentages of 39.5% (Ahmed et al 2013), 37.4% (Çatli et al 2012), 37.5% (Saunders-Blades et al 2009) and 36.4% (Pizzolante et al 2011). As stated by Saunders-Blades et al (2009), oyster shell would be one calcium source that shows quite stable calcium contents, and the data above clearly supports that statement.…”
Section: Particle Sizesupporting
confidence: 52%
“…Among them, the most important sources are limestone and oyster shell (Roland 1986, Guinotte and Nys 1991, Pizzolante et al 2011, Çatlı et al 2012, and some authors consider oyster shell to have a greater bioavailability than limestone (Brister et al 1981, Saunders-Blades et al 2009. Oyster shell is widely preferred for the nutrition of laying hens in Chile, as well as in other countries, and is regarded as an excellent source of calcium (Roland and Bryant 1999, Saunders-Blades et al 2009, Pizzolante et al 2011. Oyster shell is a sedimentary rock with varying degrees of compaction, and it is mostly composed of calcareous shells remains from marine organisms, with different proportions of clastic materials (Çatli et al 2012).…”
This study aimed to characterise oyster shell and white egg shell quality in Chile. The work was based on samples of both oyster shell and eggs, which were sourced from 7 laying farms over a period of several weeks during the production stage. Oyster shells were characterised according to their calcium content and granulometric distribution, and were classified in three types of particles (mm): coarse (≥1.7), medium-sized (0.9-1.6) and fine (≤0.8). Eggs were characterised, according to hen age and farm, by determining their weight, eggshell resistance, and thickness. Currently, Chilean farms use oyster shells whose calcium content ranges from 32.5% to 34.8%, and their granulometric distribution is 51.7% coarse, 27.6% medium-sized and 18.1% fine particles. Thus, the predominant form of oyster shell traded by major companies in Chile is the coarse type of particles, followed by medium-sized and fine particles. Similar calcium contents were observed for oyster shell samples sourced from different farms. Similar weight of the eggs were found for all farms (60-64 g). Contrarily, farms presented different results for eggshell resistance (3,934-5,057 g) and eggshell thickness (0.322-0.376 mm). Eggshell resistance and thickness values were within the expected range for white hen eggs.
“…These ranged between 33% and 35%, and show small variability for samples between farms. These values were slightly lower than those reported by other authors, averaging percentages of 39.5% (Ahmed et al 2013), 37.4% (Çatli et al 2012), 37.5% (Saunders-Blades et al 2009) and 36.4% (Pizzolante et al 2011). As stated by Saunders-Blades et al (2009), oyster shell would be one calcium source that shows quite stable calcium contents, and the data above clearly supports that statement.…”
Section: Particle Sizesupporting
confidence: 52%
“…Among them, the most important sources are limestone and oyster shell (Roland 1986, Guinotte and Nys 1991, Pizzolante et al 2011, Çatlı et al 2012, and some authors consider oyster shell to have a greater bioavailability than limestone (Brister et al 1981, Saunders-Blades et al 2009. Oyster shell is widely preferred for the nutrition of laying hens in Chile, as well as in other countries, and is regarded as an excellent source of calcium (Roland and Bryant 1999, Saunders-Blades et al 2009, Pizzolante et al 2011. Oyster shell is a sedimentary rock with varying degrees of compaction, and it is mostly composed of calcareous shells remains from marine organisms, with different proportions of clastic materials (Çatli et al 2012).…”
This study aimed to characterise oyster shell and white egg shell quality in Chile. The work was based on samples of both oyster shell and eggs, which were sourced from 7 laying farms over a period of several weeks during the production stage. Oyster shells were characterised according to their calcium content and granulometric distribution, and were classified in three types of particles (mm): coarse (≥1.7), medium-sized (0.9-1.6) and fine (≤0.8). Eggs were characterised, according to hen age and farm, by determining their weight, eggshell resistance, and thickness. Currently, Chilean farms use oyster shells whose calcium content ranges from 32.5% to 34.8%, and their granulometric distribution is 51.7% coarse, 27.6% medium-sized and 18.1% fine particles. Thus, the predominant form of oyster shell traded by major companies in Chile is the coarse type of particles, followed by medium-sized and fine particles. Similar calcium contents were observed for oyster shell samples sourced from different farms. Similar weight of the eggs were found for all farms (60-64 g). Contrarily, farms presented different results for eggshell resistance (3,934-5,057 g) and eggshell thickness (0.322-0.376 mm). Eggshell resistance and thickness values were within the expected range for white hen eggs.
“…Найпоширеніше джерело Кальцію для птиці -вапняк, який містить близько 38 % Кальцію у складі карбонату [12,13]. Дефіцит Кальцію у раціоні призводить до зменшення споживання корму, зниження яєчної продуктивності, ваги яйця, міцності яєчної шкаралупи [4,10].…”
Концентрація іонізованого Кальцію у сироватці крові зростала біль�ою мірою, ніж концентрація загального Кальцію. �а концентрацію �ос�ору розмір кормових час-. �а концентрацію �ос�ору розмір кормових час-�а концентрацію �ос�ору розмір кормових частинок вапняку не вплинув. З віком курей у сироватці їх крові зростало співвідно�ення Кальцію до �ос�ору, що пов'язано зі збіль�енням кількості Кальцію. � сироватці крові курей 2-ї групи на 15 % зросла концентрація Магнію, тоді як за збіль�ення частинок до 3 мм вміст Магнію у сироватці крові був таким самим, як у курей 1-ї групи. � сироватці крові курей 2-ї та 3-ї дослідних груп виявлено мен�у активність лужної �ос�атази, проте такий е�ект спостерігався ли�е на початку досліду.
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